Three.js: PLYExporter little endian support.
PLYExporter needs to support little endian.
I had to change code for that.
PLYExporter.d.ts
import { Object3D } from 'three';
export interface PLYExporterOptions {
binary?: boolean;
littleEndian?: boolean;
excludeAttributes?: string[];
}
export class PLYExporter {
constructor();
parse( object: Object3D, onDone: ( res: string ) => void, options: PLYExporterOptions ): string | null;
}
PLYExporter.js
/**
* @author Garrett Johnson / http://gkjohnson.github.io/
* https://github.com/gkjohnson/ply-exporter-js
*
* Usage:
* var exporter = new PLYExporter();
*
* // second argument is a list of options
* exporter.parse(mesh, data => console.log(data), { binary: true, excludeAttributes: [ 'color' ] });
*
* Format Definition:
* http://paulbourke.net/dataformats/ply/
*/
import {
BufferGeometry,
Matrix3,
Vector3
} from "three";
var PLYExporter = function () {};
PLYExporter.prototype = {
constructor: PLYExporter,
parse: function ( object, onDone, options ) {
if ( onDone && typeof onDone === 'object' ) {
console.warn( 'THREE.PLYExporter: The options parameter is now the third argument to the "parse" function. See the documentation for the new API.' );
options = onDone;
onDone = undefined;
}
// Iterate over the valid meshes in the object
function traverseMeshes( cb ) {
object.traverse( function ( child ) {
if ( child.isMesh === true ) {
var mesh = child;
var geometry = mesh.geometry;
if ( geometry.isGeometry === true ) {
geometry = geomToBufferGeom.get( geometry );
}
if ( geometry.isBufferGeometry === true ) {
if ( geometry.getAttribute( 'position' ) !== undefined ) {
cb( mesh, geometry );
}
}
}
} );
}
// Default options
var defaultOptions = {
binary: false,
excludeAttributes: [] // normal, uv, color, index
};
options = Object.assign( defaultOptions, options );
var excludeAttributes = options.excludeAttributes;
var geomToBufferGeom = new WeakMap();
var includeNormals = false;
var includeColors = false;
var includeUVs = false;
// count the vertices, check which properties are used,
// and cache the BufferGeometry
var vertexCount = 0;
var faceCount = 0;
object.traverse( function ( child ) {
if ( child.isMesh === true ) {
var mesh = child;
var geometry = mesh.geometry;
if ( geometry.isGeometry === true ) {
var bufferGeometry = geomToBufferGeom.get( geometry ) || new BufferGeometry().setFromObject( mesh );
geomToBufferGeom.set( geometry, bufferGeometry );
geometry = bufferGeometry;
}
if ( geometry.isBufferGeometry === true ) {
var vertices = geometry.getAttribute( 'position' );
var normals = geometry.getAttribute( 'normal' );
var uvs = geometry.getAttribute( 'uv' );
var colors = geometry.getAttribute( 'color' );
var indices = geometry.getIndex();
if ( vertices === undefined ) {
return;
}
vertexCount += vertices.count;
faceCount += indices ? indices.count / 3 : vertices.count / 3;
if ( normals !== undefined ) includeNormals = true;
if ( uvs !== undefined ) includeUVs = true;
if ( colors !== undefined ) includeColors = true;
}
}
} );
var includeIndices = excludeAttributes.indexOf( 'index' ) === - 1;
includeNormals = includeNormals && excludeAttributes.indexOf( 'normal' ) === - 1;
includeColors = includeColors && excludeAttributes.indexOf( 'color' ) === - 1;
includeUVs = includeUVs && excludeAttributes.indexOf( 'uv' ) === - 1;
if ( includeIndices && faceCount !== Math.floor( faceCount ) ) {
// point cloud meshes will not have an index array and may not have a
// number of vertices that is divisble by 3 (and therefore representable
// as triangles)
console.error(
'PLYExporter: Failed to generate a valid PLY file with triangle indices because the ' +
'number of indices is not divisible by 3.'
);
return null;
}
var indexByteCount = 4;
var header =
'ply\n' +
`format ${ options.binary ? (options.littleEndian?'binary_little_endian':'binary_big_endian') : 'ascii' } 1.0\n` +
`element vertex ${vertexCount}\n` +
// position
'property float x\n' +
'property float y\n' +
'property float z\n';
if ( includeNormals === true ) {
// normal
header +=
'property float nx\n' +
'property float ny\n' +
'property float nz\n';
}
if ( includeUVs === true ) {
// uvs
header +=
'property float s\n' +
'property float t\n';
}
if ( includeColors === true ) {
// colors
header +=
'property uchar red\n' +
'property uchar green\n' +
'property uchar blue\n';
}
if ( includeIndices === true ) {
// faces
header +=
`element face ${faceCount}\n` +
`property list uchar int vertex_index\n`;
}
header += 'end_header\n';
// Generate attribute data
var vertex = new Vector3();
var normalMatrixWorld = new Matrix3();
var result = null;
if ( options.binary === true ) {
// Binary File Generation
var headerBin = new TextEncoder().encode( header );
// 3 position values at 4 bytes
// 3 normal values at 4 bytes
// 3 color channels with 1 byte
// 2 uv values at 4 bytes
var vertexListLength = vertexCount * ( 4 * 3 + ( includeNormals ? 4 * 3 : 0 ) + ( includeColors ? 3 : 0 ) + ( includeUVs ? 4 * 2 : 0 ) );
// 1 byte shape desciptor
// 3 vertex indices at ${indexByteCount} bytes
var faceListLength = includeIndices ? faceCount * ( indexByteCount * 3 + 1 ) : 0;
var output = new DataView( new ArrayBuffer( headerBin.length + vertexListLength + faceListLength ) );
new Uint8Array( output.buffer ).set( headerBin, 0 );
var vOffset = headerBin.length;
var fOffset = headerBin.length + vertexListLength;
var writtenVertices = 0;
traverseMeshes( function ( mesh, geometry ) {
var vertices = geometry.getAttribute( 'position' );
var normals = geometry.getAttribute( 'normal' );
var uvs = geometry.getAttribute( 'uv' );
var colors = geometry.getAttribute( 'color' );
var indices = geometry.getIndex();
normalMatrixWorld.getNormalMatrix( mesh.matrixWorld );
for ( var i = 0, l = vertices.count; i < l; i ++ ) {
vertex.x = vertices.getX( i );
vertex.y = vertices.getY( i );
vertex.z = vertices.getZ( i );
vertex.applyMatrix4( mesh.matrixWorld );
// Position information
output.setFloat32( vOffset, vertex.x, options.littleEndian );
vOffset += 4;
output.setFloat32( vOffset, vertex.y, options.littleEndian );
vOffset += 4;
output.setFloat32( vOffset, vertex.z, options.littleEndian );
vOffset += 4;
// Normal information
if ( includeNormals === true ) {
if ( normals != null ) {
vertex.x = normals.getX( i );
vertex.y = normals.getY( i );
vertex.z = normals.getZ( i );
vertex.applyMatrix3( normalMatrixWorld ).normalize();
output.setFloat32( vOffset, vertex.x, options.littleEndian );
vOffset += 4;
output.setFloat32( vOffset, vertex.y, options.littleEndian );
vOffset += 4;
output.setFloat32( vOffset, vertex.z, options.littleEndian );
vOffset += 4;
} else {
output.setFloat32( vOffset, 0, options.littleEndian );
vOffset += 4;
output.setFloat32( vOffset, 0, options.littleEndian );
vOffset += 4;
output.setFloat32( vOffset, 0, options.littleEndian );
vOffset += 4;
}
}
// UV information
if ( includeUVs === true ) {
if ( uvs != null ) {
output.setFloat32( vOffset, uvs.getX( i ), options.littleEndian );
vOffset += 4;
output.setFloat32( vOffset, uvs.getY( i ), options.littleEndian );
vOffset += 4;
} else if ( includeUVs !== false ) {
output.setFloat32( vOffset, 0, options.littleEndian );
vOffset += 4;
output.setFloat32( vOffset, 0, options.littleEndian );
vOffset += 4;
}
}
// Color information
if ( includeColors === true ) {
if ( colors != null ) {
output.setUint8( vOffset, Math.floor( colors.getX( i ) * 255 ) );
vOffset += 1;
output.setUint8( vOffset, Math.floor( colors.getY( i ) * 255 ) );
vOffset += 1;
output.setUint8( vOffset, Math.floor( colors.getZ( i ) * 255 ) );
vOffset += 1;
} else {
output.setUint8( vOffset, 255 );
vOffset += 1;
output.setUint8( vOffset, 255 );
vOffset += 1;
output.setUint8( vOffset, 255 );
vOffset += 1;
}
}
}
if ( includeIndices === true ) {
// Create the face list
if ( indices !== null ) {
for ( var i = 0, l = indices.count; i < l; i += 3 ) {
output.setUint8( fOffset, 3 );
fOffset += 1;
output.setUint32( fOffset, indices.getX( i + 0 ) + writtenVertices, options.littleEndian );
fOffset += indexByteCount;
output.setUint32( fOffset, indices.getX( i + 1 ) + writtenVertices, options.littleEndian );
fOffset += indexByteCount;
output.setUint32( fOffset, indices.getX( i + 2 ) + writtenVertices, options.littleEndian );
fOffset += indexByteCount;
}
} else {
for ( var i = 0, l = vertices.count; i < l; i += 3 ) {
output.setUint8( fOffset, 3 );
fOffset += 1;
output.setUint32( fOffset, writtenVertices + i, options.littleEndian );
fOffset += indexByteCount;
output.setUint32( fOffset, writtenVertices + i + 1, options.littleEndian );
fOffset += indexByteCount;
output.setUint32( fOffset, writtenVertices + i + 2, options.littleEndian );
fOffset += indexByteCount;
}
}
}
// Save the amount of verts we've already written so we can offset
// the face index on the next mesh
writtenVertices += vertices.count;
} );
result = output.buffer;
} else {
// Ascii File Generation
// count the number of vertices
var writtenVertices = 0;
var vertexList = '';
var faceList = '';
traverseMeshes( function ( mesh, geometry ) {
var vertices = geometry.getAttribute( 'position' );
var normals = geometry.getAttribute( 'normal' );
var uvs = geometry.getAttribute( 'uv' );
var colors = geometry.getAttribute( 'color' );
var indices = geometry.getIndex();
normalMatrixWorld.getNormalMatrix( mesh.matrixWorld );
// form each line
for ( var i = 0, l = vertices.count; i < l; i ++ ) {
vertex.x = vertices.getX( i );
vertex.y = vertices.getY( i );
vertex.z = vertices.getZ( i );
vertex.applyMatrix4( mesh.matrixWorld );
// Position information
var line =
vertex.x + ' ' +
vertex.y + ' ' +
vertex.z;
// Normal information
if ( includeNormals === true ) {
if ( normals != null ) {
vertex.x = normals.getX( i );
vertex.y = normals.getY( i );
vertex.z = normals.getZ( i );
vertex.applyMatrix3( normalMatrixWorld ).normalize();
line += ' ' +
vertex.x + ' ' +
vertex.y + ' ' +
vertex.z;
} else {
line += ' 0 0 0';
}
}
// UV information
if ( includeUVs === true ) {
if ( uvs != null ) {
line += ' ' +
uvs.getX( i ) + ' ' +
uvs.getY( i );
} else if ( includeUVs !== false ) {
line += ' 0 0';
}
}
// Color information
if ( includeColors === true ) {
if ( colors != null ) {
line += ' ' +
Math.floor( colors.getX( i ) * 255 ) + ' ' +
Math.floor( colors.getY( i ) * 255 ) + ' ' +
Math.floor( colors.getZ( i ) * 255 );
} else {
line += ' 255 255 255';
}
}
vertexList += line + '\n';
}
// Create the face list
if ( includeIndices === true ) {
if ( indices !== null ) {
for ( var i = 0, l = indices.count; i < l; i += 3 ) {
faceList += `3 ${ indices.getX( i + 0 ) + writtenVertices }`;
faceList += ` ${ indices.getX( i + 1 ) + writtenVertices }`;
faceList += ` ${ indices.getX( i + 2 ) + writtenVertices }\n`;
}
} else {
for ( var i = 0, l = vertices.count; i < l; i += 3 ) {
faceList += `3 ${ writtenVertices + i } ${ writtenVertices + i + 1 } ${ writtenVertices + i + 2 }\n`;
}
}
faceCount += indices ? indices.count / 3 : vertices.count / 3;
}
writtenVertices += vertices.count;
} );
result = `${ header }${vertexList}${ includeIndices ? `${faceList}\n` : '\n' }`;
}
if ( typeof onDone === 'function' ) requestAnimationFrame( () => onDone( result ) );
return result;
}
};
export { PLYExporter };
Please check and include to the upcoming release.
Thanks.
Enhancement
bianyunzhi95
🎉1
All 2 comments
How about making a PR with your changes?
Mugen87
on 11 Mar 2020
👍2
@bianyunzhi95 I've copied your code to a PR so it actually lands in R115. Also enhanced the example a bit to test the new code path 馃憤
Mugen87
on 23 Mar 2020
❤1
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Most helpful comment
How about making a PR with your changes?