File: //var/www/aspa/three/addons/exporters/PLYExporter.js
import {
Matrix3,
Vector3,
Color
} from 'three';
/**
* https://github.com/gkjohnson/ply-exporter-js
*
* Usage:
* const exporter = new PLYExporter();
*
* // second argument is a list of options
* exporter.parse(mesh, data => console.log(data), { binary: true, excludeAttributes: [ 'color' ], littleEndian: true });
*
* Format Definition:
* http://paulbourke.net/dataformats/ply/
*/
class PLYExporter {
parse( object, onDone, options = {} ) {
// Iterate over the valid meshes in the object
function traverseMeshes( cb ) {
object.traverse( function ( child ) {
if ( child.isMesh === true || child.isPoints ) {
const mesh = child;
const geometry = mesh.geometry;
if ( geometry.hasAttribute( 'position' ) === true ) {
cb( mesh, geometry );
}
}
} );
}
// Default options
const defaultOptions = {
binary: false,
excludeAttributes: [], // normal, uv, color, index
littleEndian: false
};
options = Object.assign( defaultOptions, options );
const excludeAttributes = options.excludeAttributes;
let includeIndices = true;
let includeNormals = false;
let includeColors = false;
let includeUVs = false;
// count the vertices, check which properties are used,
// and cache the BufferGeometry
let vertexCount = 0;
let faceCount = 0;
object.traverse( function ( child ) {
if ( child.isMesh === true ) {
const mesh = child;
const geometry = mesh.geometry;
const vertices = geometry.getAttribute( 'position' );
const normals = geometry.getAttribute( 'normal' );
const uvs = geometry.getAttribute( 'uv' );
const colors = geometry.getAttribute( 'color' );
const 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;
} else if ( child.isPoints ) {
const mesh = child;
const geometry = mesh.geometry;
const vertices = geometry.getAttribute( 'position' );
const normals = geometry.getAttribute( 'normal' );
const colors = geometry.getAttribute( 'color' );
vertexCount += vertices.count;
if ( normals !== undefined ) includeNormals = true;
if ( colors !== undefined ) includeColors = true;
includeIndices = false;
}
} );
const tempColor = new Color();
includeIndices = 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;
}
const indexByteCount = 4;
let 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
const vertex = new Vector3();
const normalMatrixWorld = new Matrix3();
let result = null;
if ( options.binary === true ) {
// Binary File Generation
const 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
const 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
const faceListLength = includeIndices ? faceCount * ( indexByteCount * 3 + 1 ) : 0;
const output = new DataView( new ArrayBuffer( headerBin.length + vertexListLength + faceListLength ) );
new Uint8Array( output.buffer ).set( headerBin, 0 );
let vOffset = headerBin.length;
let fOffset = headerBin.length + vertexListLength;
let writtenVertices = 0;
traverseMeshes( function ( mesh, geometry ) {
const vertices = geometry.getAttribute( 'position' );
const normals = geometry.getAttribute( 'normal' );
const uvs = geometry.getAttribute( 'uv' );
const colors = geometry.getAttribute( 'color' );
const indices = geometry.getIndex();
normalMatrixWorld.getNormalMatrix( mesh.matrixWorld );
for ( let i = 0, l = vertices.count; i < l; i ++ ) {
vertex.fromBufferAttribute( vertices, 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.fromBufferAttribute( normals, 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 {
output.setFloat32( vOffset, 0, options.littleEndian );
vOffset += 4;
output.setFloat32( vOffset, 0, options.littleEndian );
vOffset += 4;
}
}
// Color information
if ( includeColors === true ) {
if ( colors != null ) {
tempColor
.fromBufferAttribute( colors, i )
.convertLinearToSRGB();
output.setUint8( vOffset, Math.floor( tempColor.r * 255 ) );
vOffset += 1;
output.setUint8( vOffset, Math.floor( tempColor.g * 255 ) );
vOffset += 1;
output.setUint8( vOffset, Math.floor( tempColor.b * 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 ( let 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 ( let 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
let writtenVertices = 0;
let vertexList = '';
let faceList = '';
traverseMeshes( function ( mesh, geometry ) {
const vertices = geometry.getAttribute( 'position' );
const normals = geometry.getAttribute( 'normal' );
const uvs = geometry.getAttribute( 'uv' );
const colors = geometry.getAttribute( 'color' );
const indices = geometry.getIndex();
normalMatrixWorld.getNormalMatrix( mesh.matrixWorld );
// form each line
for ( let i = 0, l = vertices.count; i < l; i ++ ) {
vertex.fromBufferAttribute( vertices, i );
vertex.applyMatrix4( mesh.matrixWorld );
// Position information
let line =
vertex.x + ' ' +
vertex.y + ' ' +
vertex.z;
// Normal information
if ( includeNormals === true ) {
if ( normals != null ) {
vertex.fromBufferAttribute( normals, 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 {
line += ' 0 0';
}
}
// Color information
if ( includeColors === true ) {
if ( colors != null ) {
tempColor
.fromBufferAttribute( colors, i )
.convertLinearToSRGB();
line += ' ' +
Math.floor( tempColor.r * 255 ) + ' ' +
Math.floor( tempColor.g * 255 ) + ' ' +
Math.floor( tempColor.b * 255 );
} else {
line += ' 255 255 255';
}
}
vertexList += line + '\n';
}
// Create the face list
if ( includeIndices === true ) {
if ( indices !== null ) {
for ( let 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 ( let 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 };