/**
* @author mrdoob / http://mrdoob.com/
*/
import {
BufferGeometry,
Geometry,
Line,
Matrix3,
Mesh,
Vector2,
Vector3
} from "../../../build/three.module.js";
var OBJExporter = function () {};
OBJExporter.prototype = {
constructor: OBJExporter,
parse: function ( object ) {
var output = '';
var indexVertex = 0;
var indexVertexUvs = 0;
var indexNormals = 0;
var vertex = new Vector3();
var normal = new Vector3();
var uv = new Vector2();
var i, j, k, l, m, face = [];
var parseMesh = function ( mesh ) {
var nbVertex = 0;
var nbNormals = 0;
var nbVertexUvs = 0;
var geometry = mesh.geometry;
var normalMatrixWorld = new Matrix3();
if ( geometry instanceof Geometry ) {
geometry = new BufferGeometry().setFromObject( mesh );
}
if ( geometry instanceof BufferGeometry ) {
// shortcuts
var vertices = geometry.getAttribute( 'position' );
var normals = geometry.getAttribute( 'normal' );
var uvs = geometry.getAttribute( 'uv' );
var 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 ( i = 0, l = vertices.count; i < l; i ++, nbVertex ++ ) {
vertex.x = vertices.getX( i );
vertex.y = vertices.getY( i );
vertex.z = vertices.getZ( i );
// transfrom 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 ( i = 0, l = uvs.count; i < l; i ++, nbVertexUvs ++ ) {
uv.x = uvs.getX( i );
uv.y = uvs.getY( i );
// transform the uv to export format
output += 'vt ' + uv.x + ' ' + uv.y + '\n';
}
}
// normals
if ( normals !== undefined ) {
normalMatrixWorld.getNormalMatrix( mesh.matrixWorld );
for ( i = 0, l = normals.count; i < l; i ++, nbNormals ++ ) {
normal.x = normals.getX( i );
normal.y = normals.getY( i );
normal.z = normals.getZ( i );
// transfrom 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 ( i = 0, l = indices.count; i < l; i += 3 ) {
for ( m = 0; m < 3; m ++ ) {
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 ( i = 0, l = vertices.count; i < l; i += 3 ) {
for ( m = 0; m < 3; m ++ ) {
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";
}
}
} else {
console.warn( 'THREE.OBJExporter.parseMesh(): geometry type unsupported', geometry );
}
// update index
indexVertex += nbVertex;
indexVertexUvs += nbVertexUvs;
indexNormals += nbNormals;
};
var parseLine = function ( line ) {
var nbVertex = 0;
var geometry = line.geometry;
var type = line.type;
if ( geometry instanceof Geometry ) {
geometry = new BufferGeometry().setFromObject( line );
}
if ( geometry instanceof BufferGeometry ) {
// shortcuts
var vertices = geometry.getAttribute( 'position' );
// name of the line object
output += 'o ' + line.name + '\n';
if ( vertices !== undefined ) {
for ( i = 0, l = vertices.count; i < l; i ++, nbVertex ++ ) {
vertex.x = vertices.getX( i );
vertex.y = vertices.getY( i );
vertex.z = vertices.getZ( i );
// transfrom 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 ( j = 1, l = vertices.count; j <= l; j ++ ) {
output += ( indexVertex + j ) + ' ';
}
output += '\n';
}
if ( type === 'LineSegments' ) {
for ( j = 1, k = j + 1, l = vertices.count; j < l; j += 2, k = j + 1 ) {
output += 'l ' + ( indexVertex + j ) + ' ' + ( indexVertex + k ) + '\n';
}
}
} else {
console.warn( 'THREE.OBJExporter.parseLine(): geometry type unsupported', geometry );
}
// update index
indexVertex += nbVertex;
};
object.traverse( function ( child ) {
if ( child instanceof Mesh ) {
parseMesh( child );
}
if ( child instanceof Line ) {
parseLine( child );
}
} );
return output;
}
};
export { OBJExporter };
