Volume

Introduction

This class is not intended for general use. Please use the
similarly named class under Rendering/Core. This class is
a WebGL implementation of that generic renderable class in
Rendering Core. This class will automatically get instantiated
and rendered as needed by the OpenGLRenderWindow.

Source

index.js
import { mat3, mat4 } from 'gl-matrix';

import * as macro from 'vtk.js/Sources/macros';
import vtkViewNode from 'vtk.js/Sources/Rendering/SceneGraph/ViewNode';

import { registerOverride } from 'vtk.js/Sources/Rendering/OpenGL/ViewNodeFactory';

// ----------------------------------------------------------------------------
// vtkOpenGLVolume methods
// ----------------------------------------------------------------------------

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

// Builds myself.
publicAPI.buildPass = (prepass) => {
if (!model.renderable || !model.renderable.getVisibility()) {
return;
}
if (prepass) {
model._openGLRenderWindow = publicAPI.getFirstAncestorOfType(
'vtkOpenGLRenderWindow'
);
model.openGLRenderer =
publicAPI.getFirstAncestorOfType('vtkOpenGLRenderer');
model.context = model._openGLRenderWindow.getContext();
publicAPI.prepareNodes();
publicAPI.addMissingNode(model.renderable.getMapper());
publicAPI.removeUnusedNodes();
}
};

publicAPI.queryPass = (prepass, renderPass) => {
if (prepass) {
if (!model.renderable || !model.renderable.getVisibility()) {
return;
}
renderPass.incrementVolumeCount();
}
};

publicAPI.traverseVolumePass = (renderPass) => {
if (
!model.renderable ||
!model.renderable.getNestedVisibility() ||
(model.openGLRenderer.getSelector() &&
!model.renderable.getNestedPickable())
) {
return;
}

publicAPI.apply(renderPass, true);

model.children[0].traverse(renderPass);

publicAPI.apply(renderPass, false);
};

// Renders myself
publicAPI.volumePass = (prepass) => {
if (!model.renderable || !model.renderable.getVisibility()) {
return;
}
model.context.depthMask(!prepass);
};

publicAPI.getKeyMatrices = () => {
// has the actor changed?
if (model.renderable.getMTime() > model.keyMatrixTime.getMTime()) {
model.renderable.computeMatrix();
mat4.copy(model.MCWCMatrix, model.renderable.getMatrix());
mat4.transpose(model.MCWCMatrix, model.MCWCMatrix);

if (model.renderable.getIsIdentity()) {
mat3.identity(model.normalMatrix);
} else {
mat3.fromMat4(model.normalMatrix, model.MCWCMatrix);
mat3.invert(model.normalMatrix, model.normalMatrix);
}
model.keyMatrixTime.modified();
}

return { mcwc: model.MCWCMatrix, normalMatrix: model.normalMatrix };
};
}

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

const DEFAULT_VALUES = {
// context: null,
// keyMatrixTime: null,
// normalMatrix: null,
// MCWCMatrix: null,
// _openGLRenderWindow: null,
};

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

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

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

model.keyMatrixTime = {};
macro.obj(model.keyMatrixTime, { mtime: 0 });
// always set by getter
model.normalMatrix = new Float64Array(9);
model.MCWCMatrix = new Float64Array(16);

// Build VTK API
macro.setGet(publicAPI, model, ['context']);

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

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

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

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

export default { newInstance, extend };

// Register ourself to OpenGL backend if imported
registerOverride('vtkVolume', newInstance);