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File size: 3,775 Bytes
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/**
* @author kovacsv / http://kovacsv.hu/
* @author mrdoob / http://mrdoob.com/
* @author mudcube / http://mudcu.be/
* @author Mugen87 / https://github.com/Mugen87
*
* Usage:
* var exporter = new STLExporter();
*
* // second argument is a list of options
* var data = exporter.parse( mesh, { binary: true } );
*
*/
import {
Geometry,
Matrix3,
Vector3
} from "../../../build/three.module.js";
var STLExporter = function () {};
STLExporter.prototype = {
constructor: STLExporter,
parse: ( function () {
var vector = new Vector3();
var normalMatrixWorld = new Matrix3();
return function parse( scene, options ) {
if ( options === undefined ) options = {};
var binary = options.binary !== undefined ? options.binary : false;
//
var objects = [];
var triangles = 0;
scene.traverse( function ( object ) {
if ( object.isMesh ) {
var geometry = object.geometry;
if ( geometry.isBufferGeometry ) {
geometry = new Geometry().fromBufferGeometry( geometry );
}
if ( geometry.isGeometry ) {
triangles += geometry.faces.length;
objects.push( {
geometry: geometry,
matrixWorld: object.matrixWorld
} );
}
}
} );
if ( binary ) {
var offset = 80; // skip header
var bufferLength = triangles * 2 + triangles * 3 * 4 * 4 + 80 + 4;
var arrayBuffer = new ArrayBuffer( bufferLength );
var output = new DataView( arrayBuffer );
output.setUint32( offset, triangles, true ); offset += 4;
for ( var i = 0, il = objects.length; i < il; i ++ ) {
var object = objects[ i ];
var vertices = object.geometry.vertices;
var faces = object.geometry.faces;
var matrixWorld = object.matrixWorld;
normalMatrixWorld.getNormalMatrix( matrixWorld );
for ( var j = 0, jl = faces.length; j < jl; j ++ ) {
var face = faces[ j ];
vector.copy( face.normal ).applyMatrix3( normalMatrixWorld ).normalize();
output.setFloat32( offset, vector.x, true ); offset += 4; // normal
output.setFloat32( offset, vector.y, true ); offset += 4;
output.setFloat32( offset, vector.z, true ); offset += 4;
var indices = [ face.a, face.b, face.c ];
for ( var k = 0; k < 3; k ++ ) {
vector.copy( vertices[ indices[ k ] ] ).applyMatrix4( matrixWorld );
output.setFloat32( offset, vector.x, true ); offset += 4; // vertices
output.setFloat32( offset, vector.y, true ); offset += 4;
output.setFloat32( offset, vector.z, true ); offset += 4;
}
output.setUint16( offset, 0, true ); offset += 2; // attribute byte count
}
}
return output;
} else {
var output = '';
output += 'solid exported\n';
for ( var i = 0, il = objects.length; i < il; i ++ ) {
var object = objects[ i ];
var vertices = object.geometry.vertices;
var faces = object.geometry.faces;
var matrixWorld = object.matrixWorld;
normalMatrixWorld.getNormalMatrix( matrixWorld );
for ( var j = 0, jl = faces.length; j < jl; j ++ ) {
var face = faces[ j ];
vector.copy( face.normal ).applyMatrix3( normalMatrixWorld ).normalize();
output += '\tfacet normal ' + vector.x + ' ' + vector.y + ' ' + vector.z + '\n';
output += '\t\touter loop\n';
var indices = [ face.a, face.b, face.c ];
for ( var k = 0; k < 3; k ++ ) {
vector.copy( vertices[ indices[ k ] ] ).applyMatrix4( matrixWorld );
output += '\t\t\tvertex ' + vector.x + ' ' + vector.y + ' ' + vector.z + '\n';
}
output += '\t\tendloop\n';
output += '\tendfacet\n';
}
}
output += 'endsolid exported\n';
return output;
}
};
}() )
};
export { STLExporter };
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