Mapper

Introduction

vtkMapper is an abstract class to specify interface between data and
graphics primitives. Subclasses of vtkMapper map data through a
lookuptable and control the creation of rendering primitives that
interface to the graphics library. The mapping can be controlled by
supplying a lookup table and specifying a scalar range to map data
through.

There are several important control mechanisms affecting the behavior of
this object. The ScalarVisibility flag controls whether scalar data (if
any) controls the color of the associated actor(s) that refer to the
mapper. The ScalarMode ivar is used to determine whether scalar point data
or cell data is used to color the object. By default, point data scalars
are used unless there are none, then cell scalars are used. Or you can
explicitly control whether to use point or cell scalar data. Finally, the
mapping of scalars through the lookup table varies depending on the
setting of the ColorMode flag. See the documentation for the appropriate
methods for an explanation.

Another important feature of this class is whether to use immediate mode
rendering (ImmediateModeRenderingOn) or display list rendering
(ImmediateModeRenderingOff). If display lists are used, a data structure
is constructed (generally in the rendering library) which can then be
rapidly traversed and rendered by the rendering library. The disadvantage
of display lists is that they require additional memory which may affect
the performance of the system.

Another important feature of the mapper is the ability to shift the
Z-buffer to resolve coincident topology. For example, if you’d like to
draw a mesh with some edges a different color, and the edges lie on the
mesh, this feature can be useful to get nice looking lines. (See the
ResolveCoincidentTopology-related methods.)

Methods

acquireInvertibleLookupTable

canUseTextureMapForColoring

Returns if we can use texture maps for scalar coloring. Note this doesn’t
say we “will” use scalar coloring. It says, if we do use scalar coloring,
we will use a texture.
When rendering multiblock datasets, if any 2 blocks provide different
lookup tables for the scalars, then also we cannot use textures. This case
can be handled if required.

Argument	Type	Required	Description
input		Yes

clearColorArrays

Call to force a rebuild of color result arrays on next MapScalars.
Necessary when using arrays in the case of multiblock data.

clearInvertibleColor

colorToValue

createColorTextureCoordinates

Argument	Type	Required	Description
input		Yes
output		Yes
numScalars		Yes
numComps		Yes
component		Yes
range		Yes
tableRange		Yes
tableNumberOfColors		Yes
useLogScale		Yes

createDefaultLookupTable

Create default lookup table. Generally used to create one when
none is available with the scalar data.

extend

Method used to decorate a given object (publicAPI+model) with vtkMapper characteristics.

Argument	Type	Required	Description
publicAPI		Yes	object on which methods will be bounds (public)
model		Yes	object on which data structure will be bounds (protected)
initialValues	IMapperInitialValues	No	(default: {})

getAbstractScalars

Argument	Type	Required	Description
input		Yes
scalarMode	ScalarMode	Yes
arrayAccessMode		Yes
arrayId		Yes
arrayName		Yes

getArrayAccessMode

getBounds

Get the bounds for this mapper as [xmin, xmax, ymin, ymax,zmin, zmax].

getCoincidentTopologyLineOffsetParameters

getCoincidentTopologyPointOffsetParameter

getCoincidentTopologyPolygonOffsetParameters

getColorByArrayName

Get the array name to color by.

getColorCoordinates

Provide read access to the color texture coordinate array

getColorMapColors

Provide read access to the color array.

getColorMode

Return the method of coloring scalar data.

getColorModeAsString

Return the method of coloring scalar data.

getColorTextureMap

Provide read access to the color texture array

getCustomShaderAttributes

getFieldDataTupleId

getInterpolateScalarsBeforeMapping

By default, vertex color is used to map colors to a surface.
Colors are interpolated after being mapped.
This option avoids color interpolation by using a one dimensional
texture map for the colors.

getIsOpaque

Check if the mapper does not expect to have translucent geometry. This
may happen when using ColorMode is set to not map scalars i.e. render the
scalar array directly as colors and the scalar array has opacity i.e. alpha
component. Default implementation simply returns true. Note that even if
this method returns true, an actor may treat the geometry as translucent
since a constant translucency is set on the property, for example.

getLookupTable

Get a lookup table for the mapper to use.

getPrimitiveCount

getRelativeCoincidentTopologyLineOffsetParameters

getRelativeCoincidentTopologyPointOffsetParameters

getRelativeCoincidentTopologyPolygonOffsetParameters

getResolveCoincidentTopology

getResolveCoincidentTopologyAsString

getResolveCoincidentTopologyLineOffsetParameters

getResolveCoincidentTopologyPointOffsetParameters

getResolveCoincidentTopologyPolygonOffsetFaces

getResolveCoincidentTopologyPolygonOffsetParameters

getScalarMode

Return the method for obtaining scalar data.

getScalarModeAsString

Return the method for obtaining scalar data.

getScalarRange

getScalarRangeByReference

getScalarVisibility

Check whether scalar data is used to color objects.

getStatic

Check whether the mapper’s data is static.

getUseLookupTableScalarRange

getViewSpecificProperties

mapScalars

Map the scalars (if there are any scalars and ScalarVisibility is on)
through the lookup table, returning an unsigned char RGBA array. This is
typically done as part of the rendering process. The alpha parameter
allows the blending of the scalars with an additional alpha (typically
which comes from a vtkActor, etc.)
{
rgba: Uint8Array(),
location: 0/1/2, // Points/Cells/Fields
}

Argument	Type	Required	Description
input		Yes
alpha	Number	Yes

mapScalarsToTexture

Argument	Type	Required	Description
scalars		Yes
alpha	Number	Yes

newInstance

Method used to create a new instance of vtkMapper

Argument	Type	Required	Description
initialValues	IMapperInitialValues	No	for pre-setting some of its content

scalarToTextureCoordinate

Argument	Type	Required	Description
scalarValue	Number	Yes
rangeMin	Number	Yes
invRangeWidth	Number	Yes

setArrayAccessMode

Argument	Type	Required	Description
arrayAccessMode	Number	Yes

setColorByArrayName

Set the array name to color by.

Argument	Type	Required	Description
colorByArrayName	String	Yes

setColorMode

Argument	Type	Required	Description
colorMode	Number	Yes

setColorModeToDefault

Sets colorMode to DEFAULT

setColorModeToDirectScalars

Sets colorMode to DIRECT_SCALARS

setColorModeToMapScalars

Sets colorMode to MAP_SCALARS

setCustomShaderAttributes

Sets point data array names that will be transferred to the VBO

Argument	Type	Required	Description
customShaderAttributes	Array.	Yes

setFieldDataTupleId

When ScalarMode is set to UseFieldData, set the index of the
tuple by which to color the entire data set. By default, the
index is -1, which means to treat the field data array selected
with SelectColorArray as having a scalar value for each cell.
Indices of 0 or higher mean to use the tuple at the given index
for coloring the entire data set.

Argument	Type	Required	Description
fieldDataTupleI	Number	Yes

setForceCompileOnly

Argument	Type	Required	Description
forceCompileOnly	Number	Yes

setInterpolateScalarsBeforeMapping

setLookupTable

Set a lookup table for the mapper to use.

setResolveCoincidentTopology

Argument	Type	Required	Description
mode	Number	No

setResolveCoincidentTopologyPolygonOffsetFaces

Argument	Type	Required	Description
value		Yes

setResolveCoincidentTopologyToDefault

setResolveCoincidentTopologyToOff

setResolveCoincidentTopologyToPolygonOffset

setScalarMode

Control how the filter works with scalar point data and cell attribute
data. By default (ScalarModeToDefault), the filter will use point data,
and if no point data is available, then cell data is used. Alternatively
you can explicitly set the filter to use point data
(ScalarModeToUsePointData) or cell data (ScalarModeToUseCellData).
You can also choose to get the scalars from an array in point field
data (ScalarModeToUsePointFieldData) or cell field data
(ScalarModeToUseCellFieldData). If scalars are coming from a field
data array, you must call SelectColorArray before you call GetColors.

When ScalarMode is set to use Field Data (ScalarModeToFieldData),
you must call SelectColorArray to choose the field data array to
be used to color cells. In this mode, the default behavior is to
treat the field data tuples as being associated with cells. If
the poly data contains triangle strips, the array is expected to
contain the cell data for each mini-cell formed by any triangle
strips in the poly data as opposed to treating them as a single
tuple that applies to the entire strip. This mode can also be
used to color the entire poly data by a single color obtained by
mapping the tuple at a given index in the field data array
through the color map. Use SetFieldDataTupleId() to specify
the tuple index.

Argument	Type	Required	Description
scalarMode		Yes

setScalarModeToDefault

Sets scalarMode to DEFAULT

setScalarModeToUseCellData

Sets scalarMode to USE_CELL_DATA

setScalarModeToUseCellFieldData

Sets scalarMode to USE_CELL_FIELD_DATA

setScalarModeToUseFieldData

Sets scalarMode to USE_FIELD_DATA

setScalarModeToUsePointData

Sets scalarMode to USE_POINT_DATA

setScalarModeToUsePointFieldData

Sets scalarMode to USE_POINT_FIELD_DATA

setScalarRange

Specify range in terms of scalar minimum and maximum (smin,smax). These
values are used to map scalars into lookup table. Has no effect when
UseLookupTableScalarRange is true.

Argument	Type	Required	Description
scalarRange		Yes

setScalarRange

Specify range in terms of scalar minimum and maximum (smin,smax). These
values are used to map scalars into lookup table. Has no effect when
UseLookupTableScalarRange is true.

Argument	Type	Required	Description
min		Yes
max		Yes

setScalarRangeFrom

Argument	Type	Required	Description
scalarRange		Yes

setScalarVisibility

Turn on/off flag to control whether scalar data is used to color objects.

Argument	Type	Required	Description
scalarVisibility	Boolean	Yes

setStatic

Turn on/off flag to control whether the mapper’s data is static. Static data
means that the mapper does not propagate updates down the pipeline, greatly
decreasing the time it takes to update many mappers. This should only be
used if the data never changes.

Argument	Type	Required	Description
static	Boolean	Yes

setUseLookupTableScalarRange

Control whether the mapper sets the lookuptable range based on its
own ScalarRange, or whether it will use the LookupTable ScalarRange
regardless of it’s own setting. By default the Mapper is allowed to set
the LookupTable range, but users who are sharing LookupTables between
mappers/actors will probably wish to force the mapper to use the
LookupTable unchanged.

Argument	Type	Required	Description
useLookupTableScalarRange	Boolean	Yes

setViewSpecificProperties

If you want to provide specific properties for rendering engines you can use
viewSpecificProperties.

You can go and have a look in the rendering backend of your choice for details
on specific properties.
For example, for OpenGL/WebGL see OpenGL/PolyDataMapper/api.md
If there is no details, viewSpecificProperties is not supported.

Argument	Type	Required	Description
viewSpecificProperties		Yes

useInvertibleColorFor

valueToColor

Source

CoincidentTopologyHelper.js

/* eslint-disable arrow-body-style */
import otherStaticMethods from 'vtk.js/Sources/Rendering/Core/Mapper/Static';
import macro from 'vtk.js/Sources/macros';

function addCoincidentTopologyMethods(publicAPI, model, nameList) {
  nameList.forEach((item) => {
    publicAPI[`get${item.method}`] = () => model[item.key];
    publicAPI[`set${item.method}`] = (factor, offset) => {
      model[item.key] = { factor, offset };
    };
  });
}

export const CATEGORIES = ['Polygon', 'Line', 'Point'];

// CoincidentTopology static methods ------------------------------------------

const staticOffsetModel = {
  Polygon: { factor: 2, offset: 0 },
  Line: { factor: 1, offset: -1 },
  Point: { factor: 0, offset: -2 },
};
const staticOffsetAPI = {};

addCoincidentTopologyMethods(
  staticOffsetAPI,
  staticOffsetModel,
  CATEGORIES.map((key) => ({
    key,
    method: `ResolveCoincidentTopology${key}OffsetParameters`,
  }))
);

function implementCoincidentTopologyMethods(publicAPI, model) {
  if (model.resolveCoincidentTopology === undefined) {
    model.resolveCoincidentTopology = false;
  }

  macro.setGet(publicAPI, model, ['resolveCoincidentTopology']);

  // Relative methods
  model.topologyOffset = {
    Polygon: { factor: 0, offset: 0 },
    Line: { factor: 0, offset: 0 },
    Point: { factor: 0, offset: 0 },
  };

  // Add Static methods to our instance
  Object.keys(otherStaticMethods).forEach((methodName) => {
    publicAPI[methodName] = otherStaticMethods[methodName];
  });
  Object.keys(staticOffsetAPI).forEach((methodName) => {
    publicAPI[methodName] = staticOffsetAPI[methodName];
  });

  addCoincidentTopologyMethods(
    publicAPI,
    model.topologyOffset,
    CATEGORIES.map((key) => ({
      key,
      method: `RelativeCoincidentTopology${key}OffsetParameters`,
    }))
  );

  publicAPI.getCoincidentTopologyPolygonOffsetParameters = () => {
    const globalValue =
      staticOffsetAPI.getResolveCoincidentTopologyPolygonOffsetParameters();
    const localValue =
      publicAPI.getRelativeCoincidentTopologyPolygonOffsetParameters();
    return {
      factor: globalValue.factor + localValue.factor,
      offset: globalValue.offset + localValue.offset,
    };
  };

  publicAPI.getCoincidentTopologyLineOffsetParameters = () => {
    const globalValue =
      staticOffsetAPI.getResolveCoincidentTopologyLineOffsetParameters();
    const localValue =
      publicAPI.getRelativeCoincidentTopologyLineOffsetParameters();
    return {
      factor: globalValue.factor + localValue.factor,
      offset: globalValue.offset + localValue.offset,
    };
  };

  publicAPI.getCoincidentTopologyPointOffsetParameter = () => {
    const globalValue =
      staticOffsetAPI.getResolveCoincidentTopologyPointOffsetParameters();
    const localValue =
      publicAPI.getRelativeCoincidentTopologyPointOffsetParameters();
    return {
      factor: globalValue.factor + localValue.factor,
      offset: globalValue.offset + localValue.offset,
    };
  };
}

export default {
  implementCoincidentTopologyMethods,
  staticOffsetAPI,
  otherStaticMethods,
  CATEGORIES,
};

Constants.js

export const ColorMode = {
  DEFAULT: 0,
  MAP_SCALARS: 1,
  DIRECT_SCALARS: 2,
};

export const ScalarMode = {
  DEFAULT: 0,
  USE_POINT_DATA: 1,
  USE_CELL_DATA: 2,
  USE_POINT_FIELD_DATA: 3,
  USE_CELL_FIELD_DATA: 4,
  USE_FIELD_DATA: 5,
};

export const GetArray = {
  BY_ID: 0,
  BY_NAME: 1,
};

export default {
  ColorMode,
  GetArray,
  ScalarMode,
};

Static.js

let resolveCoincidentTopologyPolygonOffsetFaces = 1;
let resolveCoincidentTopology = 0;

export const RESOLVE_COINCIDENT_TOPOLOGY_MODE = [
  'VTK_RESOLVE_OFF',
  'VTK_RESOLVE_POLYGON_OFFSET',
];

export function getResolveCoincidentTopologyPolygonOffsetFaces() {
  return resolveCoincidentTopologyPolygonOffsetFaces;
}

export function setResolveCoincidentTopologyPolygonOffsetFaces(value) {
  resolveCoincidentTopologyPolygonOffsetFaces = value;
}

export function getResolveCoincidentTopology() {
  return resolveCoincidentTopology;
}

export function setResolveCoincidentTopology(mode = 0) {
  resolveCoincidentTopology = mode;
}

export function setResolveCoincidentTopologyToDefault() {
  setResolveCoincidentTopology(0); // VTK_RESOLVE_OFF
}

export function setResolveCoincidentTopologyToOff() {
  setResolveCoincidentTopology(0); // VTK_RESOLVE_OFF
}

export function setResolveCoincidentTopologyToPolygonOffset() {
  setResolveCoincidentTopology(1); // VTK_RESOLVE_POLYGON_OFFSET
}

export function getResolveCoincidentTopologyAsString() {
  return RESOLVE_COINCIDENT_TOPOLOGY_MODE[resolveCoincidentTopology];
}

export default {
  getResolveCoincidentTopologyAsString,
  getResolveCoincidentTopologyPolygonOffsetFaces,
  getResolveCoincidentTopology,
  setResolveCoincidentTopology,
  setResolveCoincidentTopologyPolygonOffsetFaces,
  setResolveCoincidentTopologyToDefault,
  setResolveCoincidentTopologyToOff,
  setResolveCoincidentTopologyToPolygonOffset,
};

index.d.ts

import { Bounds, Range } from "../../../types";
import vtkAbstractMapper3D, { IAbstractMapper3DInitialValues } from "../AbstractMapper3D";

export enum ColorMode {
	DEFAULT,
	MAP_SCALARS,
	DIRECT_SCALARS,
}

export enum ScalarMode {
	DEFAULT,
	USE_POINT_DATA,
	USE_CELL_DATA,
	USE_POINT_FIELD_DATA,
	USE_CELL_FIELD_DATA,
	USE_FIELD_DATA,
}

export enum GetArray {
	BY_ID,
	BY_NAME,
}

interface IPrimitiveCount {
	points: number;
	verts: number;
	lines: number;
	triangles: number;
}

interface IAbstractScalars {
	cellFlag: boolean;
}

interface ICoincidentTopology {
	factor: number;
	offset: number;
}

interface IScalarToTextureCoordinate {
	texCoordS: number;
	texCoordT: number;
}

export interface IMapperInitialValues extends IAbstractMapper3DInitialValues{
	static?: boolean;
	scalarVisibility?: boolean;
	scalarRange?: Range;
	useLookupTableScalarRange?: boolean;
	colorMode?: number;
	scalarMode?: number;
	arrayAccessMode?: number;
	renderTime?: number;
	fieldDataTupleId?: number;
	interpolateScalarsBeforeMapping?: boolean;
	forceCompileOnly?: number;
	useInvertibleColors?: boolean;
	customShaderAttributes?: any;
}

export interface vtkMapper extends vtkAbstractMapper3D {
	
	/**
	 *
	 */
	acquireInvertibleLookupTable(): void;

	/**
	 * Returns if we can use texture maps for scalar coloring. Note this doesn’t
	 * say we “will” use scalar coloring. It says, if we do use scalar coloring,
	 * we will use a texture.
	 * When rendering multiblock datasets, if any 2 blocks provide different
	 * lookup tables for the scalars, then also we cannot use textures. This case
	 * can be handled if required.
	 * @param input
	 */
	canUseTextureMapForColoring(input: any): boolean;

	/**
	 * Call to force a rebuild of color result arrays on next MapScalars.
	 * Necessary when using arrays in the case of multiblock data.
	 */
	clearColorArrays(): void;

	/**
	 *
	 */
	clearInvertibleColor(): void;

	/**
	 *
	 */
	colorToValue(): void;

	/**
	 *
	 * @param input
	 * @param output
	 * @param numScalars
	 * @param numComps
	 * @param component
	 * @param range
	 * @param tableRange
	 * @param tableNumberOfColors
	 * @param useLogScale
	 */
	createColorTextureCoordinates(input: any, output: any, numScalars: number, numComps: number, component: number, range: any, tableRange: any, tableNumberOfColors: number, useLogScale: boolean): void;

	/**
	 * Create default lookup table. Generally used to create one when
	 * none is available with the scalar data.
	 */
	createDefaultLookupTable(): void;

	/**
	 *
	 * @param input
	 * @param {ScalarMode} scalarMode
	 * @param arrayAccessMode
	 * @param arrayId
	 * @param arrayName
	 */
	getAbstractScalars(input: any, scalarMode: ScalarMode, arrayAccessMode: number, arrayId: any, arrayName: any): IAbstractScalars;

	/**
	 *
	 */
	getArrayAccessMode(): number;

	/**
	 * Get the bounds for this mapper as [xmin, xmax, ymin, ymax,zmin, zmax].
	 * @return {Bounds} The bounds for the mapper.
	 */
	getBounds(): Bounds;

	/**
	 *
	 */
	getCoincidentTopologyPolygonOffsetParameters(): ICoincidentTopology;

	/**
	 *
	 */
	getCoincidentTopologyLineOffsetParameters(): ICoincidentTopology;

	/**
	 *
	 */
	getCoincidentTopologyPointOffsetParameter(): ICoincidentTopology;

	/**
	 * Get the array name to color by.
	 */
	getColorByArrayName(): string | null;

	/**
	 * Provide read access to the color texture coordinate array
	 */
	getColorCoordinates(): Float32Array | null;

	/**
	 * Provide read access to the color array.
	 */
	getColorMapColors(): Uint8Array | null;

	/**
	 * Return the method of coloring scalar data.
	 */
	getColorMode(): number;

	/**
	 * Return the method of coloring scalar data.
	 */
	getColorModeAsString(): string;

	/**
	 * Provide read access to the color texture array
	 * @todo Check the retun type
	 */
	getColorTextureMap(): any

	/**
	 *
	 * @default []
	 */
	getCustomShaderAttributes(): any

	/**
	 *
	 * @default -1
	 */
	getFieldDataTupleId(): any

	/**
	 * By default, vertex color is used to map colors to a surface.
	 * Colors are interpolated after being mapped.
	 * This option avoids color interpolation by using a one dimensional
	 * texture map for the colors.
	 * @default false
	 */
	getInterpolateScalarsBeforeMapping(): boolean;

	/**
	 * Check if the mapper does not expect to have translucent geometry. This
	 * may happen when using ColorMode is set to not map scalars i.e. render the
	 * scalar array directly as colors and the scalar array has opacity i.e. alpha
	 * component. Default implementation simply returns true. Note that even if
	 * this method returns true, an actor may treat the geometry as translucent
	 * since a constant translucency is set on the property, for example.
	 */
	getIsOpaque(): boolean;

	/**
	 * Get a lookup table for the mapper to use.
	 */
	getLookupTable(): any;

	/**
	 *
	 */
	getPrimitiveCount(): IPrimitiveCount;

	

	/**
	 * Return the method for obtaining scalar data.
	 */
	getScalarMode(): number;

	/**
	 * Return the method for obtaining scalar data.
	 */
	getScalarModeAsString(): string;

	/**
	 *
	 * @default [0, 1]
	 */
	getScalarRange(): number[];

	/**
	 *
	 * @default [0, 1]
	 */
	getScalarRangeByReference(): number[];

	/**
	 * Check whether scalar data is used to color objects.
	 * @default true
	 */
	getScalarVisibility(): boolean;

	/**
	 * Check whether the mapper’s data is static.
	 * @default false
	 */
	getStatic(): boolean;

	/**
	 *
	 * @default false
	 */
	getUseLookupTableScalarRange(): boolean;

	/**
	 *
	 * @default null
	 */
	getViewSpecificProperties(): object;

	/**
	 * Map the scalars (if there are any scalars and ScalarVisibility is on)
	 * through the lookup table, returning an unsigned char RGBA array. This is
	 * typically done as part of the rendering process. The alpha parameter
	 * allows the blending of the scalars with an additional alpha (typically
	 * which comes from a vtkActor, etc.)
	 * {
	 *     rgba: Uint8Array(),
	 *     location: 0/1/2, // Points/Cells/Fields
	 * }
	 * @param input
	 * @param {Number} alpha 
	 */
	mapScalars(input: any, alpha: number): void;

	/**
	 *
	 * @param scalars
	 * @param {Number} alpha 
	 */
	mapScalarsToTexture(scalars: any, alpha: number): void;

	/**
	 * 
	 * @param {Number} scalarValue 
	 * @param {Number} rangeMin 
	 * @param {Number} invRangeWidth 
	 */
	scalarToTextureCoordinate(scalarValue: number, rangeMin: number, invRangeWidth: number): IScalarToTextureCoordinate;

	/**
	 *
	 * @param {Number} arrayAccessMode 
	 */
	setArrayAccessMode(arrayAccessMode: number): boolean;

	/**
	 * Set the array name to color by.
	 * @param {String} colorByArrayName 
	 */
	setColorByArrayName(colorByArrayName: string): boolean;

	/**
	 *
	 * @param {Number} colorMode 
	 */
	setColorMode(colorMode: number): boolean;

	/**
	 * Sets colorMode to `DEFAULT`
	 */
	setColorModeToDefault(): boolean;

	/**
	 * Sets colorMode to `MAP_SCALARS`
	 */
	setColorModeToMapScalars(): boolean;

	/**
	 * Sets colorMode to `DIRECT_SCALARS`
	 */
	setColorModeToDirectScalars(): boolean;

	/**
	 * Sets point data array names that will be transferred to the VBO
	 * @param {String[]} customShaderAttributes 
	 */
	setCustomShaderAttributes(customShaderAttributes: string[]): boolean

	/**
	 * When ScalarMode is set to UseFieldData, set the index of the
	 * tuple by which to color the entire data set. By default, the
	 * index is -1, which means to treat the field data array selected
	 * with SelectColorArray as having a scalar value for each cell.
	 * Indices of 0 or higher mean to use the tuple at the given index
	 * for coloring the entire data set.
	 * @param {Number} fieldDataTupleI 
	 * @default -1
	 */
	setFieldDataTupleId(fieldDataTupleI: number): boolean

	/**
	 *
	 * @param {Number} forceCompileOnly
	 * @default 0
	 */
	setForceCompileOnly(forceCompileOnly: number): boolean;

	/**
	 * Set a lookup table for the mapper to use.
	 */
	setLookupTable(lookupTable: any): boolean;

	/**
	 * Control how the filter works with scalar point data and cell attribute
	 * data. By default (ScalarModeToDefault), the filter will use point data,
	 * and if no point data is available, then cell data is used. Alternatively
	 * you can explicitly set the filter to use point data
	 * (ScalarModeToUsePointData) or cell data (ScalarModeToUseCellData).
	 * You can also choose to get the scalars from an array in point field
	 * data (ScalarModeToUsePointFieldData) or cell field data
	 * (ScalarModeToUseCellFieldData). If scalars are coming from a field
	 * data array, you must call SelectColorArray before you call GetColors.
	 *
	 * When ScalarMode is set to use Field Data (ScalarModeToFieldData),
	 * you must call SelectColorArray to choose the field data array to
	 * be used to color cells. In this mode, the default behavior is to
	 * treat the field data tuples as being associated with cells. If
	 * the poly data contains triangle strips, the array is expected to
	 * contain the cell data for each mini-cell formed by any triangle
	 * strips in the poly data as opposed to treating them as a single
	 * tuple that applies to the entire strip. This mode can also be
	 * used to color the entire poly data by a single color obtained by
	 * mapping the tuple at a given index in the field data array
	 * through the color map. Use SetFieldDataTupleId() to specify
	 * the tuple index.
	 *
	 * @param scalarMode
	 */
	setScalarMode(scalarMode: number): boolean;

	/**
	 * Sets scalarMode to DEFAULT
	 */
	setScalarModeToDefault(): boolean;

	/**
	 * Sets scalarMode to USE_CELL_DATA
	 */
	setScalarModeToUseCellData(): boolean;

	/**
	 * Sets scalarMode to USE_CELL_FIELD_DATA
	 */
	setScalarModeToUseCellFieldData(): boolean;

	/**
	 * Sets scalarMode to USE_FIELD_DATA
	 */
	setScalarModeToUseFieldData(): boolean;

	/**
	 * Sets scalarMode to USE_POINT_DATA
	 */
	setScalarModeToUsePointData(): boolean;

	/**
	 * Sets scalarMode to USE_POINT_FIELD_DATA
	 */
	setScalarModeToUsePointFieldData(): boolean;

	/**
	 * Specify range in terms of scalar minimum and maximum (smin,smax). These
	 * values are used to map scalars into lookup table. Has no effect when
	 * UseLookupTableScalarRange is true.
	 *
	 * @param min
	 * @param max
	 * @default [0, 1]
	 */
	setScalarRange(min: number, max: number): boolean;

	/**
	 * Specify range in terms of scalar minimum and maximum (smin,smax). These
	 * values are used to map scalars into lookup table. Has no effect when
	 * UseLookupTableScalarRange is true.
	 *
	 * @param scalarRange
	 * @default [0, 1]
	 */
	setScalarRange(scalarRange: number[]): boolean;

	/**
	 *
	 * @param scalarRange
	 * @default [0, 1]
	 */
	setScalarRangeFrom(scalarRange: number[]): boolean;

	/**
	 * Turn on/off flag to control whether scalar data is used to color objects.
	 * @param {Boolean} scalarVisibility
	 * @default true
	 */
	setScalarVisibility(scalarVisibility: boolean): boolean;

	/**
	 * Turn on/off flag to control whether the mapper’s data is static. Static data
	 * means that the mapper does not propagate updates down the pipeline, greatly
	 * decreasing the time it takes to update many mappers. This should only be
	 * used if the data never changes.
	 *
	 * @param {Boolean} static
	 * @default false
	 */
	setStatic(static: boolean): boolean;

	/**
	 * Control whether the mapper sets the lookuptable range based on its
	 * own ScalarRange, or whether it will use the LookupTable ScalarRange
	 * regardless of it’s own setting. By default the Mapper is allowed to set
	 * the LookupTable range, but users who are sharing LookupTables between
	 * mappers/actors will probably wish to force the mapper to use the
	 * LookupTable unchanged.
	 *
	 * @param {Boolean} useLookupTableScalarRange
	 * @default false
	 */
	setUseLookupTableScalarRange(useLookupTableScalarRange: boolean): boolean;

	/**
	 * If you want to provide specific properties for rendering engines you can use
	 * viewSpecificProperties.
	 *
	 * You can go and have a look in the rendering backend of your choice for details
	 * on specific properties.
	 * For example, for OpenGL/WebGL see OpenGL/PolyDataMapper/api.md
	 * If there is no details, viewSpecificProperties is not supported.
	 * @param viewSpecificProperties
	 */
	setViewSpecificProperties(viewSpecificProperties: object): boolean;

	/**
	 *
	 */
	useInvertibleColorFor(): void;

	/**
	 *
	 */
	valueToColor(): void;

	/**
	 *
	 */
	setInterpolateScalarsBeforeMapping(interpolateScalarsBeforeMapping: boolean): boolean;
}

/**
 * Method used to decorate a given object (publicAPI+model) with vtkMapper characteristics.
 *
 * @param publicAPI object on which methods will be bounds (public)
 * @param model object on which data structure will be bounds (protected)
 * @param {IMapperInitialValues} [initialValues] (default: {})
 */
export function extend(publicAPI: object, model: object, initialValues?: IMapperInitialValues): void;

/**
 * Method used to create a new instance of vtkMapper
 * @param {IMapperInitialValues} [initialValues] for pre-setting some of its content
 */
export function newInstance(initialValues?: IMapperInitialValues): vtkMapper;

/**
 * 
 */
export function getResolveCoincidentTopologyAsString(): string;

/**
 * 
 */
export function getResolveCoincidentTopologyPolygonOffsetFaces(): ICoincidentTopology;

/**
 * 
 */
export function getResolveCoincidentTopology(): ICoincidentTopology

/**
 * 
 * @param {Number} [mode] 
 */
export function setResolveCoincidentTopology(mode?: number): boolean;

/**
 * 
 * @param value 
 */
export function setResolveCoincidentTopologyPolygonOffsetFaces(value: any): boolean;

/**
 * 
 */
export function setResolveCoincidentTopologyToDefault(): boolean;

/**
 * 
 */
export function setResolveCoincidentTopologyToOff(): boolean;

/**
 * 
 */
export function setResolveCoincidentTopologyToPolygonOffset(): boolean;

/**
 * 
 */
export function getRelativeCoincidentTopologyLineOffsetParameters(): ICoincidentTopology;

/**
 * 
 */
export function getRelativeCoincidentTopologyPointOffsetParameters(): ICoincidentTopology;

/**
 * 
 */
export function getRelativeCoincidentTopologyPolygonOffsetParameters(): ICoincidentTopology;

/**
 * 
 */
export function getResolveCoincidentTopologyLineOffsetParameters(): ICoincidentTopology;

/**
 * 
 */
export function getResolveCoincidentTopologyPointOffsetParameters(): ICoincidentTopology;

/**
 * 
 */
export function getResolveCoincidentTopologyPolygonOffsetParameters(): ICoincidentTopology;

/**
 * vtkMapper is an abstract class to specify interface between data and
 * graphics primitives. Subclasses of vtkMapper map data through a
 * lookuptable and control the creation of rendering primitives that
 * interface to the graphics library. The mapping can be controlled by
 * supplying a lookup table and specifying a scalar range to map data
 * through.
 *
 * There are several important control mechanisms affecting the behavior of
 * this object. The ScalarVisibility flag controls whether scalar data (if
 * any) controls the color of the associated actor(s) that refer to the
 * mapper. The ScalarMode ivar is used to determine whether scalar point data
 * or cell data is used to color the object. By default, point data scalars
 * are used unless there are none, then cell scalars are used. Or you can
 * explicitly control whether to use point or cell scalar data. Finally, the
 * mapping of scalars through the lookup table varies depending on the
 * setting of the ColorMode flag. See the documentation for the appropriate
 * methods for an explanation.
 *
 * Another important feature of this class is whether to use immediate mode
 * rendering (ImmediateModeRenderingOn) or display list rendering
 * (ImmediateModeRenderingOff). If display lists are used, a data structure
 * is constructed (generally in the rendering library) which can then be
 * rapidly traversed and rendered by the rendering library. The disadvantage
 * of display lists is that they require additional memory which may affect
 * the performance of the system.
 *
 * Another important feature of the mapper is the ability to shift the
 * Z-buffer to resolve coincident topology. For example, if you’d like to
 * draw a mesh with some edges a different color, and the edges lie on the
 * mesh, this feature can be useful to get nice looking lines. (See the
 * ResolveCoincidentTopology-related methods.)
 */
export declare const vtkMapper: {
	newInstance: typeof newInstance;
	extend: typeof extend;
	getResolveCoincidentTopologyAsString: typeof getResolveCoincidentTopologyAsString;
	getResolveCoincidentTopologyPolygonOffsetFaces: typeof getResolveCoincidentTopologyPolygonOffsetFaces;
	getResolveCoincidentTopology: typeof getResolveCoincidentTopology;
	setResolveCoincidentTopology: typeof setResolveCoincidentTopology;
	setResolveCoincidentTopologyPolygonOffsetFaces: typeof setResolveCoincidentTopologyPolygonOffsetFaces;
	setResolveCoincidentTopologyToDefault: typeof setResolveCoincidentTopologyToDefault;
	setResolveCoincidentTopologyToOff: typeof setResolveCoincidentTopologyToOff;
	setResolveCoincidentTopologyToPolygonOffset: typeof setResolveCoincidentTopologyToPolygonOffset;
	getRelativeCoincidentTopologyLineOffsetParameters: typeof getRelativeCoincidentTopologyLineOffsetParameters;
	getRelativeCoincidentTopologyPointOffsetParameters: typeof getRelativeCoincidentTopologyPointOffsetParameters;
	getRelativeCoincidentTopologyPolygonOffsetParameters: typeof getRelativeCoincidentTopologyPolygonOffsetParameters;
	getResolveCoincidentTopologyLineOffsetParameters: typeof getResolveCoincidentTopologyLineOffsetParameters;
	getResolveCoincidentTopologyPointOffsetParameters: typeof getResolveCoincidentTopologyPointOffsetParameters;
	getResolveCoincidentTopologyPolygonOffsetParameters: typeof getResolveCoincidentTopologyPolygonOffsetParameters;
}
export default vtkMapper;

index.js

import macro from 'vtk.js/Sources/macros';
import vtkAbstractMapper3D from 'vtk.js/Sources/Rendering/Core/AbstractMapper3D';
import vtkDataArray from 'vtk.js/Sources/Common/Core/DataArray';
import vtkImageData from 'vtk.js/Sources/Common/DataModel/ImageData';
import vtkLookupTable from 'vtk.js/Sources/Common/Core/LookupTable';
import * as vtkMath from 'vtk.js/Sources/Common/Core/Math';
import vtkScalarsToColors from 'vtk.js/Sources/Common/Core/ScalarsToColors/Constants'; // Need to go inside Constants otherwise dependency loop

import CoincidentTopologyHelper from 'vtk.js/Sources/Rendering/Core/Mapper/CoincidentTopologyHelper';
import Constants from 'vtk.js/Sources/Rendering/Core/Mapper/Constants';

const { staticOffsetAPI, otherStaticMethods } = CoincidentTopologyHelper;

const { ColorMode, ScalarMode, GetArray } = Constants;
const { VectorMode } = vtkScalarsToColors;
const { VtkDataTypes } = vtkDataArray;

// ----------------------------------------------------------------------------

function notImplemented(method) {
  return () => macro.vtkErrorMacro(`vtkMapper::${method} - NOT IMPLEMENTED`);
}

// ----------------------------------------------------------------------------
// vtkMapper methods
// ----------------------------------------------------------------------------

function vtkMapper(publicAPI, model) {
  // Set our className
  model.classHierarchy.push('vtkMapper');

  publicAPI.getBounds = () => {
    const input = publicAPI.getInputData();
    if (!input) {
      model.bounds = vtkMath.createUninitializedBounds();
    } else {
      if (!model.static) {
        publicAPI.update();
      }
      model.bounds = input.getBounds();
    }
    return model.bounds;
  };

  publicAPI.setForceCompileOnly = (v) => {
    model.forceCompileOnly = v;
    // make sure we do NOT call modified()
  };

  publicAPI.createDefaultLookupTable = () => {
    model.lookupTable = vtkLookupTable.newInstance();
  };

  publicAPI.getColorModeAsString = () =>
    macro.enumToString(ColorMode, model.colorMode);

  publicAPI.setColorModeToDefault = () => publicAPI.setColorMode(0);
  publicAPI.setColorModeToMapScalars = () => publicAPI.setColorMode(1);
  publicAPI.setColorModeToDirectScalars = () => publicAPI.setColorMode(2);

  publicAPI.getScalarModeAsString = () =>
    macro.enumToString(ScalarMode, model.scalarMode);

  publicAPI.setScalarModeToDefault = () => publicAPI.setScalarMode(0);
  publicAPI.setScalarModeToUsePointData = () => publicAPI.setScalarMode(1);
  publicAPI.setScalarModeToUseCellData = () => publicAPI.setScalarMode(2);
  publicAPI.setScalarModeToUsePointFieldData = () => publicAPI.setScalarMode(3);
  publicAPI.setScalarModeToUseCellFieldData = () => publicAPI.setScalarMode(4);
  publicAPI.setScalarModeToUseFieldData = () => publicAPI.setScalarMode(5);

  publicAPI.getAbstractScalars = (
    input,
    scalarMode,
    arrayAccessMode,
    arrayId,
    arrayName
  ) => {
    // make sure we have an input
    if (!input || !model.scalarVisibility) {
      return { scalars: null, cellFLag: false };
    }

    let scalars = null;
    let cellFlag = false;

    // get and scalar data according to scalar mode
    if (scalarMode === ScalarMode.DEFAULT) {
      scalars = input.getPointData().getScalars();
      if (!scalars) {
        scalars = input.getCellData().getScalars();
        cellFlag = true;
      }
    } else if (scalarMode === ScalarMode.USE_POINT_DATA) {
      scalars = input.getPointData().getScalars();
    } else if (scalarMode === ScalarMode.USE_CELL_DATA) {
      scalars = input.getCellData().getScalars();
      cellFlag = true;
    } else if (scalarMode === ScalarMode.USE_POINT_FIELD_DATA) {
      const pd = input.getPointData();
      if (arrayAccessMode === GetArray.BY_ID) {
        scalars = pd.getArrayByIndex(arrayId);
      } else {
        scalars = pd.getArrayByName(arrayName);
      }
    } else if (scalarMode === ScalarMode.USE_CELL_FIELD_DATA) {
      const cd = input.getCellData();
      cellFlag = true;
      if (arrayAccessMode === GetArray.BY_ID) {
        scalars = cd.getArrayByIndex(arrayId);
      } else {
        scalars = cd.getArrayByName(arrayName);
      }
    } else if (scalarMode === ScalarMode.USE_FIELD_DATA) {
      const fd = input.getFieldData();
      if (arrayAccessMode === GetArray.BY_ID) {
        scalars = fd.getArrayByIndex(arrayId);
      } else {
        scalars = fd.getArrayByName(arrayName);
      }
    }

    return { scalars, cellFlag };
  };

  publicAPI.mapScalars = (input, alpha) => {
    const scalars = publicAPI.getAbstractScalars(
      input,
      model.scalarMode,
      model.arrayAccessMode,
      model.arrayId,
      model.colorByArrayName
    ).scalars;

    if (!scalars) {
      model.colorCoordinates = null;
      model.colorTextureMap = null;
      model.colorMapColors = null;
      return;
    }

    // we want to only recompute when something has changed
    const toString = `${publicAPI.getMTime()}${scalars.getMTime()}${alpha}`;
    if (model.colorBuildString === toString) return;

    if (!model.useLookupTableScalarRange) {
      publicAPI
        .getLookupTable()
        .setRange(model.scalarRange[0], model.scalarRange[1]);
    }

    // Decide between texture color or vertex color.
    // Cell data always uses vertex color.
    // Only point data can use both texture and vertex coloring.
    if (publicAPI.canUseTextureMapForColoring(input)) {
      publicAPI.mapScalarsToTexture(scalars, alpha);
    } else {
      model.colorCoordinates = null;
      model.colorTextureMap = null;

      const lut = publicAPI.getLookupTable();
      if (lut) {
        // Ensure that the lookup table is built
        lut.build();
        model.colorMapColors = lut.mapScalars(scalars, model.colorMode, -1);
      }
    }
    model.colorBuildString = `${publicAPI.getMTime()}${scalars.getMTime()}${alpha}`;
  };

  //-----------------------------------------------------------------------------
  publicAPI.scalarToTextureCoordinate = (
    scalarValue, // Input scalar
    rangeMin, // range[0]
    invRangeWidth
  ) => {
    // 1/(range[1]-range[0])
    let texCoordS = 0.5; // Scalar value is arbitrary when NaN
    let texCoordT = 1.0; // 1.0 in t coordinate means NaN
    if (!vtkMath.isNan(scalarValue)) {
      // 0.0 in t coordinate means not NaN.  So why am I setting it to 0.49?
      // Because when you are mapping scalars and you have a NaN adjacent to
      // anything else, the interpolation everywhere should be NaN.  Thus, I
      // want the NaN color everywhere except right on the non-NaN neighbors.
      // To simulate this, I set the t coord for the real numbers close to
      // the threshold so that the interpolation almost immediately looks up
      // the NaN value.
      texCoordT = 0.49;

      texCoordS = (scalarValue - rangeMin) * invRangeWidth;

      // Some implementations apparently don't handle relatively large
      // numbers (compared to the range [0.0, 1.0]) very well. In fact,
      // values above 1122.0f appear to cause texture wrap-around on
      // some systems even when edge clamping is enabled. Why 1122.0f? I
      // don't know. For safety, we'll clamp at +/- 1000. This will
      // result in incorrect images when the texture value should be
      // above or below 1000, but I don't have a better solution.
      if (texCoordS > 1000.0) {
        texCoordS = 1000.0;
      } else if (texCoordS < -1000.0) {
        texCoordS = -1000.0;
      }
    }
    return { texCoordS, texCoordT };
  };

  //-----------------------------------------------------------------------------
  publicAPI.createColorTextureCoordinates = (
    input,
    output,
    numScalars,
    numComps,
    component,
    range,
    tableRange,
    tableNumberOfColors,
    useLogScale
  ) => {
    // We have to change the range used for computing texture
    // coordinates slightly to accommodate the special above- and
    // below-range colors that are the first and last texels,
    // respectively.
    const scalarTexelWidth = (range[1] - range[0]) / tableNumberOfColors;

    const paddedRange = [];
    paddedRange[0] = range[0] - scalarTexelWidth;
    paddedRange[1] = range[1] + scalarTexelWidth;
    const invRangeWidth = 1.0 / (paddedRange[1] - paddedRange[0]);

    const outputV = output.getData();
    const inputV = input.getData();

    let count = 0;
    let outputCount = 0;
    if (component < 0 || component >= numComps) {
      for (let scalarIdx = 0; scalarIdx < numScalars; ++scalarIdx) {
        let sum = 0;
        for (let compIdx = 0; compIdx < numComps; ++compIdx) {
          sum += inputV[count] * inputV[count];
          count++;
        }
        let magnitude = Math.sqrt(sum);
        if (useLogScale) {
          magnitude = vtkLookupTable.applyLogScale(
            magnitude,
            tableRange,
            range
          );
        }
        const outputs = publicAPI.scalarToTextureCoordinate(
          magnitude,
          paddedRange[0],
          invRangeWidth
        );
        outputV[outputCount] = outputs.texCoordS;
        outputV[outputCount + 1] = outputs.texCoordT;
        outputCount += 2;
      }
    } else {
      count += component;
      for (let scalarIdx = 0; scalarIdx < numScalars; ++scalarIdx) {
        let inputValue = inputV[count];
        if (useLogScale) {
          inputValue = vtkLookupTable.applyLogScale(
            inputValue,
            tableRange,
            range
          );
        }
        const outputs = publicAPI.scalarToTextureCoordinate(
          inputValue,
          paddedRange[0],
          invRangeWidth
        );
        outputV[outputCount] = outputs.texCoordS;
        outputV[outputCount + 1] = outputs.texCoordT;
        outputCount += 2;
        count += numComps;
      }
    }
  };

  publicAPI.mapScalarsToTexture = (scalars, alpha) => {
    const range = model.lookupTable.getRange();
    const useLogScale = model.lookupTable.usingLogScale();
    if (useLogScale) {
      // convert range to log.
      vtkLookupTable.getLogRange(range, range);
    }

    const origAlpha = model.lookupTable.getAlpha();

    // Get rid of vertex color array.  Only texture or vertex coloring
    // can be active at one time.  The existence of the array is the
    // signal to use that technique.
    model.colorMapColors = null;

    // If the lookup table has changed, then recreate the color texture map.
    // Set a new lookup table changes this->MTime.
    if (
      model.colorTextureMap == null ||
      publicAPI.getMTime() > model.colorTextureMap.getMTime() ||
      model.lookupTable.getMTime() > model.colorTextureMap.getMTime() ||
      model.lookupTable.getAlpha() !== alpha
    ) {
      model.lookupTable.setAlpha(alpha);
      model.colorTextureMap = null;

      // Get the texture map from the lookup table.
      // Create a dummy ramp of scalars.
      // In the future, we could extend vtkScalarsToColors.
      model.lookupTable.build();
      let numberOfColors = model.lookupTable.getNumberOfAvailableColors();
      if (numberOfColors > 4094) {
        numberOfColors = 4094;
      }
      numberOfColors += 2;
      const k = (range[1] - range[0]) / (numberOfColors - 1 - 2);

      const newArray = new Float64Array(numberOfColors * 2);

      for (let i = 0; i < numberOfColors; ++i) {
        newArray[i] = range[0] + i * k - k; // minus k to start at below range color
        if (useLogScale) {
          newArray[i] = 10.0 ** newArray[i];
        }
      }
      // Dimension on NaN.
      for (let i = 0; i < numberOfColors; ++i) {
        newArray[i + numberOfColors] = NaN;
      }

      model.colorTextureMap = vtkImageData.newInstance();
      model.colorTextureMap.setExtent(0, numberOfColors - 1, 0, 1, 0, 0);

      const tmp = vtkDataArray.newInstance({
        numberOfComponents: 1,
        values: newArray,
      });

      model.colorTextureMap
        .getPointData()
        .setScalars(model.lookupTable.mapScalars(tmp, model.colorMode, 0));
      model.lookupTable.setAlpha(origAlpha);
    }

    // Create new coordinates if necessary.
    // Need to compare lookup table in case the range has changed.
    if (
      !model.colorCoordinates ||
      publicAPI.getMTime() > model.colorCoordinates.getMTime() ||
      publicAPI.getInputData(0).getMTime() >
        model.colorCoordinates.getMTime() ||
      model.lookupTable.getMTime() > model.colorCoordinates.getMTime()
    ) {
      // Get rid of old colors
      model.colorCoordinates = null;

      // Now create the color texture coordinates.
      const numComps = scalars.getNumberOfComponents();
      const num = scalars.getNumberOfTuples();

      // const fArray = new FloatArray(num * 2);
      model.colorCoordinates = vtkDataArray.newInstance({
        numberOfComponents: 2,
        values: new Float32Array(num * 2),
      });

      let scalarComponent = model.lookupTable.getVectorComponent();
      // Although I like the feature of applying magnitude to single component
      // scalars, it is not how the old MapScalars for vertex coloring works.
      if (
        model.lookupTable.getVectorMode() === VectorMode.MAGNITUDE &&
        scalars.getNumberOfComponents() > 1
      ) {
        scalarComponent = -1;
      }

      publicAPI.createColorTextureCoordinates(
        scalars,
        model.colorCoordinates,
        num,
        numComps,
        scalarComponent,
        range,
        model.lookupTable.getRange(),
        model.colorTextureMap.getPointData().getScalars().getNumberOfTuples() /
          2 -
          2,
        useLogScale
      );
    }
  };

  publicAPI.getIsOpaque = () => {
    const lut = publicAPI.getLookupTable();
    if (lut) {
      // Ensure that the lookup table is built
      lut.build();
      return lut.isOpaque();
    }
    return true;
  };

  publicAPI.canUseTextureMapForColoring = (input) => {
    if (!model.interpolateScalarsBeforeMapping) {
      return false; // user doesn't want us to use texture maps at all.
    }

    // index color does not use textures
    if (model.lookupTable && model.lookupTable.getIndexedLookup()) {
      return false;
    }

    const gasResult = publicAPI.getAbstractScalars(
      input,
      model.scalarMode,
      model.arrayAccessMode,
      model.arrayId,
      model.colorByArrayName
    );
    const scalars = gasResult.scalars;

    if (!scalars) {
      // no scalars on this dataset, we don't care if texture is used at all.
      return false;
    }

    if (gasResult.cellFlag) {
      return false; // cell data colors, don't use textures.
    }

    if (
      (model.colorMode === ColorMode.DEFAULT &&
        scalars.getDataType() === VtkDataTypes.UNSIGNED_CHAR) ||
      model.colorMode === ColorMode.DIRECT_SCALARS
    ) {
      // Don't use texture is direct coloring using RGB unsigned chars is
      // requested.
      return false;
    }

    return true;
  };

  publicAPI.clearColorArrays = () => {
    model.colorMapColors = null;
    model.colorCoordinates = null;
    model.colorTextureMap = null;
  };

  publicAPI.getLookupTable = () => {
    if (!model.lookupTable) {
      publicAPI.createDefaultLookupTable();
    }
    return model.lookupTable;
  };

  publicAPI.getMTime = () => {
    let mt = model.mtime;
    if (model.lookupTable !== null) {
      const time = model.lookupTable.getMTime();
      mt = time > mt ? time : mt;
    }
    return mt;
  };

  publicAPI.getPrimitiveCount = () => {
    const input = publicAPI.getInputData();
    const pcount = {
      points: input.getPoints().getNumberOfValues() / 3,
      verts:
        input.getVerts().getNumberOfValues() -
        input.getVerts().getNumberOfCells(),
      lines:
        input.getLines().getNumberOfValues() -
        2 * input.getLines().getNumberOfCells(),
      triangles:
        input.getPolys().getNumberOfValues() -
        3 * input.getLines().getNumberOfCells(),
    };
    return pcount;
  };

  publicAPI.acquireInvertibleLookupTable = notImplemented(
    'AcquireInvertibleLookupTable'
  );
  publicAPI.valueToColor = notImplemented('ValueToColor');
  publicAPI.colorToValue = notImplemented('ColorToValue');
  publicAPI.useInvertibleColorFor = notImplemented('UseInvertibleColorFor');
  publicAPI.clearInvertibleColor = notImplemented('ClearInvertibleColor');
}

// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------

const DEFAULT_VALUES = {
  colorMapColors: null, // Same as this->Colors

  static: false,
  lookupTable: null,

  scalarVisibility: true,
  scalarRange: [0, 1],
  useLookupTableScalarRange: false,

  colorMode: 0,
  scalarMode: 0,
  arrayAccessMode: 1, // By_NAME

  renderTime: 0,

  colorByArrayName: null,

  fieldDataTupleId: -1,

  interpolateScalarsBeforeMapping: false,
  colorCoordinates: null,
  colorTextureMap: null,

  forceCompileOnly: 0,

  useInvertibleColors: false,
  invertibleScalars: null,

  viewSpecificProperties: null,

  customShaderAttributes: [],
};

// ----------------------------------------------------------------------------

export function extend(publicAPI, model, initialValues = {}) {
  Object.assign(model, DEFAULT_VALUES, initialValues);

  // Inheritance
  vtkAbstractMapper3D.extend(publicAPI, model, initialValues);

  macro.get(publicAPI, model, [
    'colorCoordinates',
    'colorMapColors',
    'colorTextureMap',
  ]);
  macro.setGet(publicAPI, model, [
    'colorByArrayName',
    'arrayAccessMode',
    'colorMode',
    'fieldDataTupleId',
    'interpolateScalarsBeforeMapping',
    'lookupTable',
    'renderTime',
    'scalarMode',
    'scalarVisibility',
    'static',
    'useLookupTableScalarRange',
    'viewSpecificProperties',
    'customShaderAttributes', // point data array names that will be transferred to the VBO
  ]);
  macro.setGetArray(publicAPI, model, ['scalarRange'], 2);

  if (!model.viewSpecificProperties) {
    model.viewSpecificProperties = {};
  }

  CoincidentTopologyHelper.implementCoincidentTopologyMethods(publicAPI, model);

  // Object methods
  vtkMapper(publicAPI, model);
}

// ----------------------------------------------------------------------------

export const newInstance = macro.newInstance(extend, 'vtkMapper');

// ----------------------------------------------------------------------------

export default {
  newInstance,
  extend,
  ...staticOffsetAPI,
  ...otherStaticMethods,
  ...Constants,
};