@xeokit/xeokit-sdk
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3D BIM IFC Viewer SDK for AEC engineering applications. Open Source JavaScript Toolkit based on pure WebGL for top performance, real-world coordinates and full double precision
313 lines (289 loc) • 10.3 kB
JavaScript
import {Mesh} from "../../viewer/scene/mesh/Mesh.js";
import {ReadableGeometry} from "../../viewer/scene/geometry/ReadableGeometry.js";
import {MetallicMaterial} from "../../viewer/scene/materials/MetallicMaterial.js";
import {math} from "../../viewer/scene/math/math.js";
import {worldToRTCPositions} from "../../viewer/scene/math/rtcCoords.js";
import {core} from "../../viewer/scene/core.js";
const tempVec3a = math.vec3();
/**
* @private
*/
class STLSceneGraphLoader {
load(plugin, modelNode, src, options, ok, error) {
options = options || {};
const spinner = plugin.viewer.scene.canvas.spinner;
spinner.processes++;
plugin.dataSource.getSTL(src, function (data) { // OK
parse(plugin, modelNode, data, options);
try {
const binData = ensureBinary(data);
if (isBinary(binData)) {
parseBinary(plugin, binData, modelNode, options);
} else {
parseASCII(plugin, ensureString(data), modelNode, options);
}
spinner.processes--;
core.scheduleTask(function () {
modelNode.fire("loaded", true, false);
});
if (ok) {
ok();
}
} catch (e) {
spinner.processes--;
plugin.error(e);
if (error) {
error(e);
}
modelNode.fire("error", e);
}
},
function (msg) {
spinner.processes--;
plugin.error(msg);
if (error) {
error(msg);
}
modelNode.fire("error", msg);
});
}
parse(plugin, modelNode, data, options) {
const spinner = plugin.viewer.scene.canvas.spinner;
spinner.processes++;
try {
const binData = ensureBinary(data);
if (isBinary(binData)) {
parseBinary(plugin, binData, modelNode, options);
} else {
parseASCII(plugin, ensureString(data), modelNode, options);
}
spinner.processes--;
core.scheduleTask(function () {
modelNode.fire("loaded", true, false);
});
} catch (e) {
spinner.processes--;
modelNode.fire("error", e);
}
}
}
function parse(plugin, modelNode, data, options) {
try {
const binData = ensureBinary(data);
if (isBinary(binData)) {
parseBinary(plugin, binData, modelNode, options);
} else {
parseASCII(plugin, ensureString(data), modelNode, options);
}
} catch (e) {
modelNode.fire("error", e);
}
}
function isBinary(data) {
const reader = new DataView(data);
const numFaces = reader.getUint32(80, true);
const faceSize = (32 / 8 * 3) + ((32 / 8 * 3) * 3) + (16 / 8);
const numExpectedBytes = 80 + (32 / 8) + (numFaces * faceSize);
if (numExpectedBytes === reader.byteLength) {
return true;
}
const solid = [115, 111, 108, 105, 100];
for (var i = 0; i < 5; i++) {
if (solid[i] !== reader.getUint8(i, false)) {
return true;
}
}
return false;
}
function parseBinary(plugin, data, modelNode, options) {
const reader = new DataView(data);
const faces = reader.getUint32(80, true);
let r;
let g;
let b;
let hasColors = false;
let colors;
let defaultR;
let defaultG;
let defaultB;
let lastR = null;
let lastG = null;
let lastB = null;
let newMesh = false;
let alpha;
for (let index = 0; index < 80 - 10; index++) {
if ((reader.getUint32(index, false) === 0x434F4C4F /*COLO*/) &&
(reader.getUint8(index + 4) === 0x52 /*'R'*/) &&
(reader.getUint8(index + 5) === 0x3D /*'='*/)) {
hasColors = true;
colors = [];
defaultR = reader.getUint8(index + 6) / 255;
defaultG = reader.getUint8(index + 7) / 255;
defaultB = reader.getUint8(index + 8) / 255;
alpha = reader.getUint8(index + 9) / 255;
}
}
const material = new MetallicMaterial(modelNode, { // Share material with all meshes
roughness: 0.5
});
// var material = new PhongMaterial(modelNode, { // Share material with all meshes
// diffuse: [0.4, 0.4, 0.4],
// reflectivity: 1,
// specular: [0.5, 0.5, 1.0]
// });
let dataOffset = 84;
let faceLength = 12 * 4 + 2;
let positions = [];
let normals = [];
let splitMeshes = options.splitMeshes;
for (let face = 0; face < faces; face++) {
let start = dataOffset + face * faceLength;
let normalX = reader.getFloat32(start, true);
let normalY = reader.getFloat32(start + 4, true);
let normalZ = reader.getFloat32(start + 8, true);
if (hasColors) {
let packedColor = reader.getUint16(start + 48, true);
if ((packedColor & 0x8000) === 0) {
r = (packedColor & 0x1F) / 31;
g = ((packedColor >> 5) & 0x1F) / 31;
b = ((packedColor >> 10) & 0x1F) / 31;
} else {
r = defaultR;
g = defaultG;
b = defaultB;
}
if (splitMeshes && r !== lastR || g !== lastG || b !== lastB) {
if (lastR !== null) {
newMesh = true;
}
lastR = r;
lastG = g;
lastB = b;
}
}
for (let i = 1; i <= 3; i++) {
let vertexstart = start + i * 12;
positions.push(reader.getFloat32(vertexstart, true));
positions.push(reader.getFloat32(vertexstart + 4, true));
positions.push(reader.getFloat32(vertexstart + 8, true));
normals.push(normalX, normalY, normalZ);
if (hasColors) {
colors.push(r, g, b, 1); // TODO: handle alpha
}
}
if (splitMeshes && newMesh) {
addMesh(modelNode, positions, normals, colors, material, options);
positions = [];
normals = [];
colors = colors ? [] : null;
newMesh = false;
}
}
if (positions.length > 0) {
addMesh(modelNode, positions, normals, colors, material, options);
}
}
function parseASCII(plugin, data, modelNode, options) {
const faceRegex = /facet([\s\S]*?)endfacet/g;
let faceCounter = 0;
const floatRegex = /[\s]+([+-]?(?:\d+.\d+|\d+.|\d+|.\d+)(?:[eE][+-]?\d+)?)/.source;
const vertexRegex = new RegExp('vertex' + floatRegex + floatRegex + floatRegex, 'g');
const normalRegex = new RegExp('normal' + floatRegex + floatRegex + floatRegex, 'g');
const positions = [];
const normals = [];
const colors = null;
let normalx;
let normaly;
let normalz;
let result;
let verticesPerFace;
let normalsPerFace;
let text;
while ((result = faceRegex.exec(data)) !== null) {
verticesPerFace = 0;
normalsPerFace = 0;
text = result[0];
while ((result = normalRegex.exec(text)) !== null) {
normalx = parseFloat(result[1]);
normaly = parseFloat(result[2]);
normalz = parseFloat(result[3]);
normalsPerFace++;
}
while ((result = vertexRegex.exec(text)) !== null) {
positions.push(parseFloat(result[1]), parseFloat(result[2]), parseFloat(result[3]));
normals.push(normalx, normaly, normalz);
verticesPerFace++;
}
if (normalsPerFace !== 1) {
plugin.error("Error in normal of face " + faceCounter);
}
if (verticesPerFace !== 3) {
plugin.error("Error in positions of face " + faceCounter);
}
faceCounter++;
}
const material = new MetallicMaterial(modelNode, {
roughness: 0.5
});
// var material = new PhongMaterial(modelNode, {
// diffuse: [0.4, 0.4, 0.4],
// reflectivity: 1,
// specular: [0.5, 0.5, 1.0]
// });
addMesh(modelNode, positions, normals, colors, material, options);
}
function addMesh(modelNode, positions, normals, colors, material, options) {
const indices = new Int32Array(positions.length / 3);
for (let ni = 0, len = indices.length; ni < len; ni++) {
indices[ni] = ni;
}
normals = normals && normals.length > 0 ? normals : null;
colors = colors && colors.length > 0 ? colors : null;
if (options.smoothNormals) {
math.faceToVertexNormals(positions, normals, options);
}
const origin = tempVec3a;
worldToRTCPositions(positions, positions, origin);
const geometry = new ReadableGeometry(modelNode, {
primitive: "triangles",
positions: positions,
normals: normals,
colors: colors,
indices: indices
});
const mesh = new Mesh(modelNode, {
origin: (origin[0] !== 0 || origin[1] !== 0 || origin[2] !== 0) ? origin : null,
geometry: geometry,
material: material,
edges: options.edges
});
modelNode.addChild(mesh);
}
function ensureString(buffer) {
if (typeof buffer !== 'string') {
return decodeText(new Uint8Array(buffer));
}
return buffer;
}
function ensureBinary(buffer) {
if (typeof buffer === 'string') {
const arrayBuffer = new Uint8Array(buffer.length);
for (let i = 0; i < buffer.length; i++) {
arrayBuffer[i] = buffer.charCodeAt(i) & 0xff; // implicitly assumes little-endian
}
return arrayBuffer.buffer || arrayBuffer;
} else {
return buffer;
}
}
function decodeText(array) {
if (typeof TextDecoder !== 'undefined') {
return new TextDecoder().decode(array);
}
let s = '';
for (let i = 0, il = array.length; i < il; i++) {
s += String.fromCharCode(array[i]); // Implicitly assumes little-endian.
}
return decodeURIComponent(escape(s));
}
export {STLSceneGraphLoader}