( function () {
class OBJExporter {
parse( object ) {
let output = '';
let indexVertex = 0;
let indexVertexUvs = 0;
let indexNormals = 0;
const vertex = new THREE.Vector3();
const color = new THREE.Color();
const normal = new THREE.Vector3();
const uv = new THREE.Vector2();
const face = [];
function parseMesh( mesh ) {
let nbVertex = 0;
let nbNormals = 0;
let nbVertexUvs = 0;
const geometry = mesh.geometry;
const normalMatrixWorld = new THREE.Matrix3(); // shortcuts
const vertices = geometry.getAttribute( 'position' );
const normals = geometry.getAttribute( 'normal' );
const uvs = geometry.getAttribute( 'uv' );
const indices = geometry.getIndex(); // name of the mesh object
output += 'o ' + mesh.name + '\n'; // name of the mesh material
if ( mesh.material && mesh.material.name ) {
output += 'usemtl ' + mesh.material.name + '\n';
} // vertices
if ( vertices !== undefined ) {
for ( let i = 0, l = vertices.count; i < l; i ++, nbVertex ++ ) {
vertex.fromBufferAttribute( vertices, i ); // transform the vertex to world space
vertex.applyMatrix4( mesh.matrixWorld ); // transform the vertex to export format
output += 'v ' + vertex.x + ' ' + vertex.y + ' ' + vertex.z + '\n';
}
} // uvs
if ( uvs !== undefined ) {
for ( let i = 0, l = uvs.count; i < l; i ++, nbVertexUvs ++ ) {
uv.fromBufferAttribute( uvs, i ); // transform the uv to export format
output += 'vt ' + uv.x + ' ' + uv.y + '\n';
}
} // normals
if ( normals !== undefined ) {
normalMatrixWorld.getNormalMatrix( mesh.matrixWorld );
for ( let i = 0, l = normals.count; i < l; i ++, nbNormals ++ ) {
normal.fromBufferAttribute( normals, i ); // transform the normal to world space
normal.applyMatrix3( normalMatrixWorld ).normalize(); // transform the normal to export format
output += 'vn ' + normal.x + ' ' + normal.y + ' ' + normal.z + '\n';
}
} // faces
if ( indices !== null ) {
for ( let i = 0, l = indices.count; i < l; i += 3 ) {
for ( let m = 0; m < 3; m ++ ) {
const j = indices.getX( i + m ) + 1;
face[ m ] = indexVertex + j + ( normals || uvs ? '/' + ( uvs ? indexVertexUvs + j : '' ) + ( normals ? '/' + ( indexNormals + j ) : '' ) : '' );
} // transform the face to export format
output += 'f ' + face.join( ' ' ) + '\n';
}
} else {
for ( let i = 0, l = vertices.count; i < l; i += 3 ) {
for ( let m = 0; m < 3; m ++ ) {
const j = i + m + 1;
face[ m ] = indexVertex + j + ( normals || uvs ? '/' + ( uvs ? indexVertexUvs + j : '' ) + ( normals ? '/' + ( indexNormals + j ) : '' ) : '' );
} // transform the face to export format
output += 'f ' + face.join( ' ' ) + '\n';
}
} // update index
indexVertex += nbVertex;
indexVertexUvs += nbVertexUvs;
indexNormals += nbNormals;
}
function parseLine( line ) {
let nbVertex = 0;
const geometry = line.geometry;
const type = line.type; // shortcuts
const vertices = geometry.getAttribute( 'position' ); // name of the line object
output += 'o ' + line.name + '\n';
if ( vertices !== undefined ) {
for ( let i = 0, l = vertices.count; i < l; i ++, nbVertex ++ ) {
vertex.fromBufferAttribute( vertices, i ); // transform the vertex to world space
vertex.applyMatrix4( line.matrixWorld ); // transform the vertex to export format
output += 'v ' + vertex.x + ' ' + vertex.y + ' ' + vertex.z + '\n';
}
}
if ( type === 'Line' ) {
output += 'l ';
for ( let j = 1, l = vertices.count; j <= l; j ++ ) {
output += indexVertex + j + ' ';
}
output += '\n';
}
if ( type === 'LineSegments' ) {
for ( let j = 1, k = j + 1, l = vertices.count; j < l; j += 2, k = j + 1 ) {
output += 'l ' + ( indexVertex + j ) + ' ' + ( indexVertex + k ) + '\n';
}
} // update index
indexVertex += nbVertex;
}
function parsePoints( points ) {
let nbVertex = 0;
const geometry = points.geometry;
const vertices = geometry.getAttribute( 'position' );
const colors = geometry.getAttribute( 'color' );
output += 'o ' + points.name + '\n';
if ( vertices !== undefined ) {
for ( let i = 0, l = vertices.count; i < l; i ++, nbVertex ++ ) {
vertex.fromBufferAttribute( vertices, i );
vertex.applyMatrix4( points.matrixWorld );
output += 'v ' + vertex.x + ' ' + vertex.y + ' ' + vertex.z;
if ( colors !== undefined ) {
color.fromBufferAttribute( colors, i ).convertLinearToSRGB();
output += ' ' + color.r + ' ' + color.g + ' ' + color.b;
}
output += '\n';
}
output += 'p ';
for ( let j = 1, l = vertices.count; j <= l; j ++ ) {
output += indexVertex + j + ' ';
}
output += '\n';
} // update index
indexVertex += nbVertex;
}
object.traverse( function ( child ) {
if ( child.isMesh === true ) {
parseMesh( child );
}
if ( child.isLine === true ) {
parseLine( child );
}
if ( child.isPoints === true ) {
parsePoints( child );
}
} );
return output;
}
}
THREE.OBJExporter = OBJExporter;
} )();
