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import vtkDataArray from 'vtk.js/Sources/Common/Core/DataArray';
import * as vtkMath from 'vtk.js/Sources/Common/Core/Math';
import vtkPolyData from 'vtk.js/Sources/Common/DataModel/PolyData';
const { vtkErrorMacro } = macro;
// ----------------------------------------------------------------------------
// vtkTextureMapToPlane methods
// ----------------------------------------------------------------------------
function vtkTextureMapToPlane(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkTextureMapToPlane');
function computeNormal(output) {
const VTK_TOLERANCE = 0.001;
// First thing to do is to get an initial normal and point to define
// the plane. Then, use this information to construct better
// matrices. If problem occurs, then the point and plane becomes the
// fallback value
const nbPoints = output.getPoints().getNumberOfPoints();
let dir = 0;
let m = [0, 0, 0, 0, 0, 0, 0, 0, 0];
const x = [0, 0, 0];
const v = [0, 0, 0];
// Get minimum width of bounding box.
const bounds = output.getBounds();
const minBounds = [bounds[0], bounds[2], bounds[4]];
const maxBounds = [bounds[1], bounds[3], bounds[5]];
const length = Math.sqrt(
vtkMath.distance2BetweenPoints(minBounds, maxBounds)
);
let w = length;
let i = 0;
for (; i < 3; i++) {
model.normal[i] = 0.0;
if (bounds[2 * i + 1] - bounds[2 * i] < w) {
dir = i;
w = bounds[2 * i + 1] - bounds[2 * i];
}
}
// If the bounds is perpendicular to one of the axes, then can
// quickly compute normal.
//
model.normal[dir] = 1.0;
Iif (w <= length * VTK_TOLERANCE) {
return;
}
// Need to compute least squares approximation. Depending on major
// normal direction (dir), construct matrices appropriately.
//
// Compute 3x3 least squares matrix
v[0] = 0.0;
v[1] = 0.0;
v[2] = 0.0;
for (let ptId = 0; ptId < nbPoints; ptId++) {
output.getPoints().getPoint(ptId, x);
v[0] += x[0] * x[2];
v[1] += x[1] * x[2];
v[2] += x[2];
m[0] += x[0] * x[0];
m[1] += x[0] * x[1];
m[2] += x[0];
m[3] += x[0] * x[1];
m[4] += x[1] * x[1];
m[5] += x[1];
m[6] += x[0];
m[7] += x[1];
}
m[8] = nbPoints;
// Solve linear system using Kramers rule
const c1 = [m[0], m[1], m[2]];
const c2 = [m[3], m[4], m[5]];
const c3 = [m[6], m[7], m[8]];
const det = vtkMath.determinant3x3(m);
Iif (det <= VTK_TOLERANCE) {
return;
}
m = vtkMath.rowsToMat3(v, c2, c3, []);
model.normal[0] = vtkMath.determinant3x3(m) / det;
m = vtkMath.rowsToMat3(c1, v, c3, []);
model.normal[1] = vtkMath.determinant3x3(m) / det;
// because of the formulation
model.normal[2] = -1.0;
}
publicAPI.requestData = (inData, outData) => {
Iif (model.deleted) {
return;
}
const input = inData[0];
const nbPoints = input.getPoints().getNumberOfPoints();
Iif (nbPoints < 3 && model.automaticPlaneGeneration) {
vtkErrorMacro("Can't generate texture coordinates without points");
return;
}
const output = vtkPolyData.newInstance();
output
.getPoints()
.setData(new Float32Array(input.getPoints().getData()), 3);
output.getPolys().setData(new Uint32Array(input.getPolys().getData()));
const tcoordsData = [];
let minProj = 0;
let i = 0;
let j = 0;
let proj = 0;
const axis = [0, 0, 0];
let dir = 0;
const tAxis = [0, 0, 0];
const sAxis = [0, 0, 0];
let s = 0;
let t = 0;
let sSf = 0;
let tSf = 0;
const p = [0, 0, 0];
// Compute least squares plane if on automatic mode; otherwise use
// normal specified or plane specified
if (
model.automaticPlaneGeneration &&
model.origin[0] === 0 &&
model.origin[1] === 0 &&
model.origin[2] === 0 &&
model.point1[0] === 0 &&
model.point1[1] === 0 &&
model.point2[0] === 0 &&
model.point2[1] === 0
) {
if (model.automaticPlaneGeneration) {
computeNormal(output);
}
vtkMath.normalize(model.normal);
// Now project each point onto plane generating s,t texture coordinates
//
// Create local s-t coordinate system. Need to find the two axes on
// the plane and encompassing all the points. Hence use the bounding
// box as a reference.
minProj = 1.0;
i = 0;
for (; i < 3; i++) {
axis[0] = 0.0;
axis[1] = 0.0;
axis[2] = 0.0;
axis[i] = 1.0;
proj = Math.abs(vtkMath.dot(model.normal, axis));
if (proj < minProj) {
minProj = proj;
dir = i;
}
}
axis[0] = 0.0;
axis[1] = 0.0;
axis[2] = 0.0;
axis[dir] = 1.0;
vtkMath.cross(model.normal, axis, tAxis);
vtkMath.normalize(tAxis);
vtkMath.cross(tAxis, model.normal, sAxis);
// Construct projection matrices
//
// Arrange s-t axes so that parametric location of points will fall
// between s_range and t_range. Simplest to do by projecting maximum
// corner of bounding box unto plane and backing out scale factors.
//
const bounds = output.getBounds();
for (i = 0; i < 3; i++) {
axis[i] = bounds[2 * i + 1] - bounds[2 * i];
}
s = vtkMath.dot(sAxis, axis);
t = vtkMath.dot(tAxis, axis);
sSf = (model.sRange[1] - model.sRange[0]) / s;
tSf = (model.tRange[1] - model.tRange[0]) / t;
// Now can loop over all points, computing parametric coordinates.
for (i = 0; i < nbPoints; i++) {
output.getPoints().getPoint(i, p);
for (j = 0; j < 3; j++) {
axis[j] = p[j] - bounds[2 * j];
}
tcoordsData.push(model.sRange[0] + vtkMath.dot(sAxis, axis) * sSf);
tcoordsData.push(model.tRange[0] + vtkMath.dot(tAxis, axis) * tSf);
}
} else {
let num = 0;
// compute axes
for (i = 0; i < 3; i++) {
sAxis[i] = model.point1[i] - model.origin[i];
tAxis[i] = model.point2[i] - model.origin[i];
}
let sDenom = vtkMath.dot(sAxis, sAxis);
let tDenom = vtkMath.dot(tAxis, tAxis);
Iif (sDenom === 0.0 || tDenom === 0.0) {
vtkErrorMacro('Bad plane definition');
sDenom = 1.0;
tDenom = 1.0;
}
// compute s-t coordinates
for (i = 0; i < nbPoints; i++) {
output.getPoints().getPoint(i, p);
for (j = 0; j < 3; j++) {
axis[j] = p[j] - model.origin[j];
}
// s-coordinate
num = sAxis[0] * axis[0] + sAxis[1] * axis[1] + sAxis[2] * axis[2];
tcoordsData.push(num / sDenom);
// t-coordinate
num = tAxis[0] * axis[0] + tAxis[1] * axis[1] + tAxis[2] * axis[2];
tcoordsData.push(num / tDenom);
}
}
const tCoords = vtkDataArray.newInstance({
name: 'Texture Coordinates',
numberOfComponents: 2,
size: nbPoints,
values: tcoordsData,
});
output.getPointData().setTCoords(tCoords);
// Update output
outData[0] = output;
};
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
origin: [0, 0, 0],
point1: [0, 0, 0],
point2: [0, 0, 0],
normal: [0, 0, 0],
sRange: [0, 1],
tRange: [0, 1],
automaticPlaneGeneration: 1,
};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);
// Build VTK API
macro.obj(publicAPI, model);
macro.setGetArray(
publicAPI,
model,
['origin', 'point1', 'point2', 'normal'],
3
);
macro.setGetArray(publicAPI, model, ['sRange', 'tRange'], 2);
macro.setGet(publicAPI, model, ['automaticPlaneGeneration']);
macro.algo(publicAPI, model, 1, 1);
vtkTextureMapToPlane(publicAPI, model);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(extend, 'vtkTextureMapToPlane');
// ----------------------------------------------------------------------------
export default { newInstance, extend };
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