three-stdlib/exporters/OBJExporter.cjs.map

stand-alone library of threejs examples

{"version":3,"file":"OBJExporter.cjs","sources":["../../src/exporters/OBJExporter.ts"],"sourcesContent":["import { BufferAttribute, Color, Line, Matrix3, Mesh, Object3D, Points, Vector2, Vector3 } from 'three'\n\nclass OBJExporter {\n  private output\n\n  private indexVertex\n  private indexVertexUvs\n  private indexNormals\n\n  private vertex\n  private color\n  private normal\n  private uv\n\n  private face: string[]\n\n  constructor() {\n    this.output = ''\n\n    this.indexVertex = 0\n    this.indexVertexUvs = 0\n    this.indexNormals = 0\n\n    this.vertex = new Vector3()\n    this.color = new Color()\n    this.normal = new Vector3()\n    this.uv = new Vector2()\n\n    this.face = []\n  }\n\n  public parse(object: Object3D): string {\n    object.traverse((child) => {\n      if (child instanceof Mesh && child.isMesh) {\n        this.parseMesh(child)\n      }\n\n      if (child instanceof Line && child.isLine) {\n        this.parseLine(child)\n      }\n\n      if (child instanceof Points && child.isPoints) {\n        this.parsePoints(child)\n      }\n    })\n\n    return this.output\n  }\n\n  private parseMesh(mesh: Mesh): void {\n    let nbVertex = 0\n    let nbNormals = 0\n    let nbVertexUvs = 0\n\n    const geometry = mesh.geometry\n\n    const normalMatrixWorld = new Matrix3()\n\n    if (!geometry.isBufferGeometry) {\n      throw new Error('THREE.OBJExporter: Geometry is not of type THREE.BufferGeometry.')\n    }\n\n    // shortcuts\n    const vertices = geometry.getAttribute('position')\n    const normals = geometry.getAttribute('normal')\n    const uvs = geometry.getAttribute('uv')\n    const indices = geometry.getIndex()\n\n    // name of the mesh object\n    this.output += `o ${mesh.name}\\n`\n\n    // name of the mesh material\n    if (mesh.material && !Array.isArray(mesh.material) && mesh.material.name) {\n      this.output += `usemtl ${mesh.material.name}\\n`\n    }\n\n    // vertices\n\n    if (vertices !== undefined) {\n      for (let i = 0, l = vertices.count; i < l; i++, nbVertex++) {\n        this.vertex.x = vertices.getX(i)\n        this.vertex.y = vertices.getY(i)\n        this.vertex.z = vertices.getZ(i)\n\n        // transform the vertex to world space\n        this.vertex.applyMatrix4(mesh.matrixWorld)\n\n        // transform the vertex to export format\n        this.output += `v ${this.vertex.x} ${this.vertex.y} ${this.vertex.z}\\n`\n      }\n    }\n\n    // uvs\n\n    if (uvs !== undefined) {\n      for (let i = 0, l = uvs.count; i < l; i++, nbVertexUvs++) {\n        this.uv.x = uvs.getX(i)\n        this.uv.y = uvs.getY(i)\n\n        // transform the uv to export format\n        this.output += `vt ${this.uv.x} ${this.uv.y}\\n`\n      }\n    }\n\n    // normals\n\n    if (normals !== undefined) {\n      normalMatrixWorld.getNormalMatrix(mesh.matrixWorld)\n\n      for (let i = 0, l = normals.count; i < l; i++, nbNormals++) {\n        this.normal.x = normals.getX(i)\n        this.normal.y = normals.getY(i)\n        this.normal.z = normals.getZ(i)\n\n        // transform the normal to world space\n        this.normal.applyMatrix3(normalMatrixWorld).normalize()\n\n        // transform the normal to export format\n        this.output += `vn ${this.normal.x} ${this.normal.y} ${this.normal.z}\\n`\n      }\n    }\n\n    // faces\n\n    if (indices !== null) {\n      for (let i = 0, l = indices.count; i < l; i += 3) {\n        for (let m = 0; m < 3; m++) {\n          const j = indices.getX(i + m) + 1\n\n          this.face[m] =\n            this.indexVertex +\n            j +\n            (normals || uvs\n              ? `/${uvs ? this.indexVertexUvs + j : ''}${normals ? `/${this.indexNormals + j}` : ''}`\n              : '')\n        }\n\n        // transform the face to export format\n        this.output += `f ${this.face.join(' ')}\\n`\n      }\n    } else {\n      for (let i = 0, l = vertices.count; i < l; i += 3) {\n        for (let m = 0; m < 3; m++) {\n          const j = i + m + 1\n\n          this.face[m] =\n            this.indexVertex +\n            j +\n            (normals || uvs\n              ? `/${uvs ? this.indexVertexUvs + j : ''}${normals ? `/${this.indexNormals + j}` : ''}`\n              : '')\n        }\n\n        // transform the face to export format\n        this.output += `f ${this.face.join(' ')}\\n`\n      }\n    }\n\n    // update index\n    this.indexVertex += nbVertex\n    this.indexVertexUvs += nbVertexUvs\n    this.indexNormals += nbNormals\n  }\n\n  private parseLine(line: Line): void {\n    let nbVertex = 0\n\n    const geometry = line.geometry\n    const type = line.type\n\n    if (geometry.isBufferGeometry) {\n      throw new Error('THREE.OBJExporter: Geometry is not of type THREE.BufferGeometry.')\n    }\n\n    // shortcuts\n    const vertices = geometry.getAttribute('position')\n\n    // name of the line object\n    this.output += `o ${line.name}\\n`\n\n    if (vertices !== undefined) {\n      for (let i = 0, l = vertices.count; i < l; i++, nbVertex++) {\n        this.vertex.x = vertices.getX(i)\n        this.vertex.y = vertices.getY(i)\n        this.vertex.z = vertices.getZ(i)\n\n        // transform the vertex to world space\n        this.vertex.applyMatrix4(line.matrixWorld)\n\n        // transform the vertex to export format\n        this.output += `v ${this.vertex.x} ${this.vertex.y} ${this.vertex.z}\\n`\n      }\n    }\n\n    if (type === 'Line') {\n      this.output += 'l '\n\n      for (let j = 1, l = vertices.count; j <= l; j++) {\n        this.output += `${this.indexVertex + j} `\n      }\n\n      this.output += '\\n'\n    }\n\n    if (type === 'LineSegments') {\n      for (let j = 1, k = j + 1, l = vertices.count; j < l; j += 2, k = j + 1) {\n        this.output += `l ${this.indexVertex + j} ${this.indexVertex + k}\\n`\n      }\n    }\n\n    // update index\n    this.indexVertex += nbVertex\n  }\n\n  private parsePoints(points: Points): void {\n    let nbVertex = 0\n\n    const geometry = points.geometry\n\n    if (!geometry.isBufferGeometry) {\n      throw new Error('THREE.OBJExporter: Geometry is not of type THREE.BufferGeometry.')\n    }\n\n    const vertices = geometry.getAttribute('position')\n    const colors = geometry.getAttribute('color')\n\n    this.output += `o ${points.name}\\n`\n\n    if (vertices !== undefined) {\n      for (let i = 0, l = vertices.count; i < l; i++, nbVertex++) {\n        this.vertex.fromBufferAttribute(vertices, i)\n        this.vertex.applyMatrix4(points.matrixWorld)\n\n        this.output += `v ${this.vertex.x} ${this.vertex.y} ${this.vertex.z}`\n\n        if (colors !== undefined && colors instanceof BufferAttribute) {\n          this.color.fromBufferAttribute(colors, i)\n\n          this.output += ` ${this.color.r} ${this.color.g} ${this.color.b}`\n        }\n\n        this.output += '\\n'\n      }\n    }\n\n    this.output += 'p '\n\n    for (let j = 1, l = vertices.count; j <= l; j++) {\n      this.output += `${this.indexVertex + j} `\n    }\n\n    this.output += '\\n'\n\n    // update index\n    this.indexVertex += nbVertex\n  }\n}\n\nexport { OBJExporter 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