/**
|
* @author mrdoob / http://mrdoob.com/
|
*/
|
|
export default function (THREE) {
|
let {
|
BufferGeometry,
|
FileLoader,
|
Float32BufferAttribute,
|
Group,
|
LineBasicMaterial,
|
LineSegments,
|
Loader,
|
LoaderUtils,
|
Material,
|
Mesh,
|
MeshPhongMaterial,
|
NoColors,
|
Points,
|
PointsMaterial,
|
VertexColors
|
} = THREE;
|
|
|
|
// o object_name | g group_name
|
var object_pattern = /^[og]\s*(.+)?/;
|
// mtllib file_reference
|
var material_library_pattern = /^mtllib /;
|
// usemtl material_name
|
var material_use_pattern = /^usemtl /;
|
|
function ParserState() {
|
|
var state = {
|
objects: [],
|
object: {},
|
|
vertices: [],
|
normals: [],
|
colors: [],
|
uvs: [],
|
|
materialLibraries: [],
|
|
startObject: function (name, fromDeclaration) {
|
|
// If the current object (initial from reset) is not from a g/o declaration in the parsed
|
// file. We need to use it for the first parsed g/o to keep things in sync.
|
if (this.object && this.object.fromDeclaration === false) {
|
|
this.object.name = name;
|
this.object.fromDeclaration = (fromDeclaration !== false);
|
return;
|
|
}
|
|
var previousMaterial = (this.object && typeof this.object.currentMaterial === 'function' ? this.object.currentMaterial() : undefined);
|
|
if (this.object && typeof this.object._finalize === 'function') {
|
|
this.object._finalize(true);
|
|
}
|
|
this.object = {
|
name: name || '',
|
fromDeclaration: (fromDeclaration !== false),
|
|
geometry: {
|
vertices: [],
|
normals: [],
|
colors: [],
|
uvs: []
|
},
|
materials: [],
|
smooth: true,
|
|
startMaterial: function (name, libraries) {
|
|
var previous = this._finalize(false);
|
|
// New usemtl declaration overwrites an inherited material, except if faces were declared
|
// after the material, then it must be preserved for proper MultiMaterial continuation.
|
if (previous && (previous.inherited || previous.groupCount <= 0)) {
|
|
this.materials.splice(previous.index, 1);
|
|
}
|
|
var material = {
|
index: this.materials.length,
|
name: name || '',
|
mtllib: (Array.isArray(libraries) && libraries.length > 0 ? libraries[libraries.length - 1] : ''),
|
smooth: (previous !== undefined ? previous.smooth : this.smooth),
|
groupStart: (previous !== undefined ? previous.groupEnd : 0),
|
groupEnd: - 1,
|
groupCount: - 1,
|
inherited: false,
|
|
clone: function (index) {
|
|
var cloned = {
|
index: (typeof index === 'number' ? index : this.index),
|
name: this.name,
|
mtllib: this.mtllib,
|
smooth: this.smooth,
|
groupStart: 0,
|
groupEnd: - 1,
|
groupCount: - 1,
|
inherited: false
|
};
|
cloned.clone = this.clone.bind(cloned);
|
return cloned;
|
|
}
|
};
|
|
this.materials.push(material);
|
|
return material;
|
|
},
|
|
currentMaterial: function () {
|
|
if (this.materials.length > 0) {
|
|
return this.materials[this.materials.length - 1];
|
|
}
|
|
return undefined;
|
|
},
|
|
_finalize: function (end) {
|
|
var lastMultiMaterial = this.currentMaterial();
|
if (lastMultiMaterial && lastMultiMaterial.groupEnd === - 1) {
|
|
lastMultiMaterial.groupEnd = this.geometry.vertices.length / 3;
|
lastMultiMaterial.groupCount = lastMultiMaterial.groupEnd - lastMultiMaterial.groupStart;
|
lastMultiMaterial.inherited = false;
|
|
}
|
|
// Ignore objects tail materials if no face declarations followed them before a new o/g started.
|
if (end && this.materials.length > 1) {
|
|
for (var mi = this.materials.length - 1; mi >= 0; mi--) {
|
|
if (this.materials[mi].groupCount <= 0) {
|
|
this.materials.splice(mi, 1);
|
|
}
|
|
}
|
|
}
|
|
// Guarantee at least one empty material, this makes the creation later more straight forward.
|
if (end && this.materials.length === 0) {
|
|
this.materials.push({
|
name: '',
|
smooth: this.smooth
|
});
|
|
}
|
|
return lastMultiMaterial;
|
|
}
|
};
|
|
// Inherit previous objects material.
|
// Spec tells us that a declared material must be set to all objects until a new material is declared.
|
// If a usemtl declaration is encountered while this new object is being parsed, it will
|
// overwrite the inherited material. Exception being that there was already face declarations
|
// to the inherited material, then it will be preserved for proper MultiMaterial continuation.
|
|
if (previousMaterial && previousMaterial.name && typeof previousMaterial.clone === 'function') {
|
|
var declared = previousMaterial.clone(0);
|
declared.inherited = true;
|
this.object.materials.push(declared);
|
|
}
|
|
this.objects.push(this.object);
|
|
},
|
|
finalize: function () {
|
|
if (this.object && typeof this.object._finalize === 'function') {
|
|
this.object._finalize(true);
|
|
}
|
|
},
|
|
parseVertexIndex: function (value, len) {
|
|
var index = parseInt(value, 10);
|
return (index >= 0 ? index - 1 : index + len / 3) * 3;
|
|
},
|
|
parseNormalIndex: function (value, len) {
|
|
var index = parseInt(value, 10);
|
return (index >= 0 ? index - 1 : index + len / 3) * 3;
|
|
},
|
|
parseUVIndex: function (value, len) {
|
|
var index = parseInt(value, 10);
|
return (index >= 0 ? index - 1 : index + len / 2) * 2;
|
|
},
|
|
addVertex: function (a, b, c) {
|
|
var src = this.vertices;
|
var dst = this.object.geometry.vertices;
|
|
dst.push(src[a + 0], src[a + 1], src[a + 2]);
|
dst.push(src[b + 0], src[b + 1], src[b + 2]);
|
dst.push(src[c + 0], src[c + 1], src[c + 2]);
|
|
},
|
|
addVertexPoint: function (a) {
|
|
var src = this.vertices;
|
var dst = this.object.geometry.vertices;
|
|
dst.push(src[a + 0], src[a + 1], src[a + 2]);
|
|
},
|
|
addVertexLine: function (a) {
|
|
var src = this.vertices;
|
var dst = this.object.geometry.vertices;
|
|
dst.push(src[a + 0], src[a + 1], src[a + 2]);
|
|
},
|
|
addNormal: function (a, b, c) {
|
|
var src = this.normals;
|
var dst = this.object.geometry.normals;
|
|
dst.push(src[a + 0], src[a + 1], src[a + 2]);
|
dst.push(src[b + 0], src[b + 1], src[b + 2]);
|
dst.push(src[c + 0], src[c + 1], src[c + 2]);
|
|
},
|
|
addColor: function (a, b, c) {
|
|
var src = this.colors;
|
var dst = this.object.geometry.colors;
|
|
dst.push(src[a + 0], src[a + 1], src[a + 2]);
|
dst.push(src[b + 0], src[b + 1], src[b + 2]);
|
dst.push(src[c + 0], src[c + 1], src[c + 2]);
|
|
},
|
|
addUV: function (a, b, c) {
|
|
var src = this.uvs;
|
var dst = this.object.geometry.uvs;
|
|
dst.push(src[a + 0], src[a + 1]);
|
dst.push(src[b + 0], src[b + 1]);
|
dst.push(src[c + 0], src[c + 1]);
|
|
},
|
|
addUVLine: function (a) {
|
|
var src = this.uvs;
|
var dst = this.object.geometry.uvs;
|
|
dst.push(src[a + 0], src[a + 1]);
|
|
},
|
|
addFace: function (a, b, c, ua, ub, uc, na, nb, nc) {
|
|
var vLen = this.vertices.length;
|
|
var ia = this.parseVertexIndex(a, vLen);
|
var ib = this.parseVertexIndex(b, vLen);
|
var ic = this.parseVertexIndex(c, vLen);
|
|
this.addVertex(ia, ib, ic);
|
|
if (this.colors.length > 0) {
|
|
this.addColor(ia, ib, ic);
|
|
}
|
|
if (ua !== undefined && ua !== '') {
|
|
var uvLen = this.uvs.length;
|
ia = this.parseUVIndex(ua, uvLen);
|
ib = this.parseUVIndex(ub, uvLen);
|
ic = this.parseUVIndex(uc, uvLen);
|
this.addUV(ia, ib, ic);
|
|
}
|
|
if (na !== undefined && na !== '') {
|
|
// Normals are many times the same. If so, skip function call and parseInt.
|
var nLen = this.normals.length;
|
ia = this.parseNormalIndex(na, nLen);
|
|
ib = na === nb ? ia : this.parseNormalIndex(nb, nLen);
|
ic = na === nc ? ia : this.parseNormalIndex(nc, nLen);
|
|
this.addNormal(ia, ib, ic);
|
|
}
|
|
},
|
|
addPointGeometry: function (vertices) {
|
|
this.object.geometry.type = 'Points';
|
|
var vLen = this.vertices.length;
|
|
for (var vi = 0, l = vertices.length; vi < l; vi++) {
|
|
this.addVertexPoint(this.parseVertexIndex(vertices[vi], vLen));
|
|
}
|
|
},
|
|
addLineGeometry: function (vertices, uvs) {
|
|
this.object.geometry.type = 'Line';
|
|
var vLen = this.vertices.length;
|
var uvLen = this.uvs.length;
|
|
for (var vi = 0, l = vertices.length; vi < l; vi++) {
|
|
this.addVertexLine(this.parseVertexIndex(vertices[vi], vLen));
|
|
}
|
|
for (var uvi = 0, l = uvs.length; uvi < l; uvi++) {
|
|
this.addUVLine(this.parseUVIndex(uvs[uvi], uvLen));
|
|
}
|
|
}
|
|
};
|
|
state.startObject('', false);
|
|
return state;
|
|
}
|
|
//
|
|
function OBJLoader(manager) {
|
|
Loader.call(this, manager);
|
|
this.materials = null;
|
|
}
|
|
OBJLoader.prototype = Object.assign(Object.create(Loader.prototype), {
|
|
constructor: OBJLoader,
|
setPath:function(value){
|
this.path = value;
|
},
|
|
load: function (url, onLoad, onProgress, onError) {
|
|
var scope = this;
|
var path = (this.path === '') ? LoaderUtils.extractUrlBase(url) : this.path;
|
var loader = new FileLoader(scope.manager);
|
loader.setPath(this.path);
|
loader.load(url, function (text) {
|
|
onLoad(scope.parse(text,path));
|
|
}, onProgress, onError);
|
|
},
|
|
setMaterials: function (materials) {
|
|
this.materials = materials;
|
|
return this;
|
|
},
|
|
parse: function (text) {
|
|
console.time('OBJLoader');
|
|
var state = new ParserState();
|
|
if (text.indexOf('\r\n') !== - 1) {
|
|
// This is faster than String.split with regex that splits on both
|
text = text.replace(/\r\n/g, '\n');
|
|
}
|
|
if (text.indexOf('\\\n') !== - 1) {
|
|
// join lines separated by a line continuation character (\)
|
text = text.replace(/\\\n/g, '');
|
|
}
|
|
var lines = text.split('\n');
|
var line = '', lineFirstChar = '';
|
var lineLength = 0;
|
var result = [];
|
|
// Faster to just trim left side of the line. Use if available.
|
var trimLeft = (typeof ''.trimLeft === 'function');
|
|
for (var i = 0, l = lines.length; i < l; i++) {
|
|
line = lines[i];
|
|
line = trimLeft ? line.trimLeft() : line.trim();
|
|
lineLength = line.length;
|
|
if (lineLength === 0) continue;
|
|
lineFirstChar = line.charAt(0);
|
|
// @todo invoke passed in handler if any
|
if (lineFirstChar === '#') continue;
|
|
if (lineFirstChar === 'v') {
|
// \f -> 匹配一个换页
|
// \n -> 匹配一个换行符
|
// \r -> 匹配一个回车符
|
// \t -> 匹配一个制表符
|
// \v -> 匹配一个垂直制表符
|
// \s+ 表示匹配任意多个上面的字符
|
var data = line.split(/\s+/);
|
// var data = line.split(" ");
|
|
switch (data[0]) {
|
|
case 'v':
|
state.vertices.push(
|
parseFloat(data[1]),
|
parseFloat(data[2]),
|
parseFloat(data[3])
|
);
|
if (data.length >= 7) {
|
|
state.colors.push(
|
parseFloat(data[4]),
|
parseFloat(data[5]),
|
parseFloat(data[6])
|
|
);
|
|
}
|
break;
|
case 'vn':
|
state.normals.push(
|
parseFloat(data[1]),
|
parseFloat(data[2]),
|
parseFloat(data[3])
|
);
|
break;
|
case 'vt':
|
state.uvs.push(
|
parseFloat(data[1]),
|
parseFloat(data[2])
|
);
|
break;
|
|
}
|
|
} else if (lineFirstChar === 'f') {
|
|
var lineData = line.substr(1).trim();
|
var vertexData = lineData.split(/\s+/);
|
// var vertexData = lineData.split(" ");
|
var faceVertices = [];
|
|
// Parse the face vertex data into an easy to work with format
|
|
for (var j = 0, jl = vertexData.length; j < jl; j++) {
|
|
var vertex = vertexData[j];
|
|
if (vertex.length > 0) {
|
|
var vertexParts = vertex.split('/');
|
faceVertices.push(vertexParts);
|
|
}
|
|
}
|
|
// Draw an edge between the first vertex and all subsequent vertices to form an n-gon
|
|
var v1 = faceVertices[0];
|
|
for (var j = 1, jl = faceVertices.length - 1; j < jl; j++) {
|
|
var v2 = faceVertices[j];
|
var v3 = faceVertices[j + 1];
|
|
state.addFace(
|
v1[0], v2[0], v3[0],
|
v1[1], v2[1], v3[1],
|
v1[2], v2[2], v3[2]
|
);
|
|
}
|
|
} else if (lineFirstChar === 'l') {
|
|
var lineParts = line.substring(1).trim().split(" ");
|
var lineVertices = [], lineUVs = [];
|
|
if (line.indexOf("/") === - 1) {
|
|
lineVertices = lineParts;
|
|
} else {
|
|
for (var li = 0, llen = lineParts.length; li < llen; li++) {
|
|
var parts = lineParts[li].split("/");
|
|
if (parts[0] !== "") lineVertices.push(parts[0]);
|
if (parts[1] !== "") lineUVs.push(parts[1]);
|
|
}
|
|
}
|
state.addLineGeometry(lineVertices, lineUVs);
|
|
} else if (lineFirstChar === 'p') {
|
|
var lineData = line.substr(1).trim();
|
var pointData = lineData.split(" ");
|
|
state.addPointGeometry(pointData);
|
|
} else if ((result = object_pattern.exec(line)) !== null) {
|
|
// o object_name
|
// or
|
// g group_name
|
|
// WORKAROUND: https://bugs.chromium.org/p/v8/issues/detail?id=2869
|
// var name = result[ 0 ].substr( 1 ).trim();
|
var name = (" " + result[0].substr(1).trim()).substr(1);
|
|
state.startObject(name);
|
|
} else if (material_use_pattern.test(line)) {
|
|
// material
|
|
state.object.startMaterial(line.substring(7).trim(), state.materialLibraries);
|
|
} else if (material_library_pattern.test(line)) {
|
|
// mtl file
|
|
state.materialLibraries.push(line.substring(7).trim());
|
|
} else if (lineFirstChar === 's') {
|
|
result = line.split(' ');
|
|
// smooth shading
|
|
// @todo Handle files that have varying smooth values for a set of faces inside one geometry,
|
// but does not define a usemtl for each face set.
|
// This should be detected and a dummy material created (later MultiMaterial and geometry groups).
|
// This requires some care to not create extra material on each smooth value for "normal" obj files.
|
// where explicit usemtl defines geometry groups.
|
// Example asset: examples/models/obj/cerberus/Cerberus.obj
|
|
/*
|
* http://paulbourke.net/dataformats/obj/
|
* or
|
* http://www.cs.utah.edu/~boulos/cs3505/obj_spec.pdf
|
*
|
* From chapter "Grouping" Syntax explanation "s group_number":
|
* "group_number is the smoothing group number. To turn off smoothing groups, use a value of 0 or off.
|
* Polygonal elements use group numbers to put elements in different smoothing groups. For free-form
|
* surfaces, smoothing groups are either turned on or off; there is no difference between values greater
|
* than 0."
|
*/
|
if (result.length > 1) {
|
|
var value = result[1].trim().toLowerCase();
|
state.object.smooth = (value !== '0' && value !== 'off');
|
|
} else {
|
|
// ZBrush can produce "s" lines #11707
|
state.object.smooth = true;
|
|
}
|
var material = state.object.currentMaterial();
|
if (material) material.smooth = state.object.smooth;
|
|
} else {
|
|
// Handle null terminated files without exception
|
if (line === '\0') continue;
|
|
throw new Error('THREE.OBJLoader: Unexpected line: "' + line + '"');
|
|
}
|
|
}
|
|
state.finalize();
|
|
var container = new Group();
|
container.materialLibraries = [].concat(state.materialLibraries);
|
|
for (var i = 0, l = state.objects.length; i < l; i++) {
|
|
var object = state.objects[i];
|
var geometry = object.geometry;
|
var materials = object.materials;
|
var isLine = (geometry.type === 'Line');
|
var isPoints = (geometry.type === 'Points');
|
var hasVertexColors = false;
|
|
// Skip o/g line declarations that did not follow with any faces
|
if (geometry.vertices.length === 0) continue;
|
|
var buffergeometry = new BufferGeometry();
|
|
buffergeometry.setAttribute('position', new Float32BufferAttribute(geometry.vertices, 3));
|
|
if (geometry.normals.length > 0) {
|
|
buffergeometry.setAttribute('normal', new Float32BufferAttribute(geometry.normals, 3));
|
|
} else {
|
|
buffergeometry.computeVertexNormals();
|
|
}
|
|
if (geometry.colors.length > 0) {
|
|
hasVertexColors = true;
|
buffergeometry.setAttribute('color', new Float32BufferAttribute(geometry.colors, 3));
|
|
}
|
|
if (geometry.uvs.length > 0) {
|
|
buffergeometry.setAttribute('uv', new Float32BufferAttribute(geometry.uvs, 2));
|
|
}
|
|
// Create materials
|
|
var createdMaterials = [];
|
|
for (var mi = 0, miLen = materials.length; mi < miLen; mi++) {
|
|
var sourceMaterial = materials[mi];
|
var material = undefined;
|
|
if (this.materials !== null) {
|
|
material = this.materials.create(sourceMaterial.name);
|
|
// mtl etc. loaders probably can't create line materials correctly, copy properties to a line material.
|
if (isLine && material && !(material instanceof LineBasicMaterial)) {
|
|
var materialLine = new LineBasicMaterial();
|
Material.prototype.copy.call(materialLine, material);
|
materialLine.color.copy(material.color);
|
material = materialLine;
|
|
} else if (isPoints && material && !(material instanceof PointsMaterial)) {
|
|
var materialPoints = new PointsMaterial({ size: 10, sizeAttenuation: false });
|
Material.prototype.copy.call(materialPoints, material);
|
materialPoints.color.copy(material.color);
|
materialPoints.map = material.map;
|
material = materialPoints;
|
|
}
|
|
}
|
|
if (!material) {
|
|
if (isLine) {
|
|
material = new LineBasicMaterial();
|
|
} else if (isPoints) {
|
|
material = new PointsMaterial({ size: 1, sizeAttenuation: false });
|
|
} else {
|
|
material = new MeshPhongMaterial();
|
|
}
|
|
material.name = sourceMaterial.name;
|
|
}
|
|
material.flatShading = sourceMaterial.smooth ? false : true;
|
material.vertexColors = hasVertexColors ? VertexColors : NoColors;
|
|
createdMaterials.push(material);
|
|
}
|
|
// Create mesh
|
|
var mesh;
|
|
if (createdMaterials.length > 1) {
|
|
for (var mi = 0, miLen = materials.length; mi < miLen; mi++) {
|
|
var sourceMaterial = materials[mi];
|
buffergeometry.addGroup(sourceMaterial.groupStart, sourceMaterial.groupCount, mi);
|
|
}
|
|
if (isLine) {
|
|
mesh = new LineSegments(buffergeometry, createdMaterials);
|
|
} else if (isPoints) {
|
|
mesh = new Points(buffergeometry, createdMaterials);
|
|
} else {
|
|
mesh = new Mesh(buffergeometry, createdMaterials);
|
|
}
|
|
} else {
|
|
if (isLine) {
|
|
mesh = new LineSegments(buffergeometry, createdMaterials[0]);
|
|
} else if (isPoints) {
|
|
mesh = new Points(buffergeometry, createdMaterials[0]);
|
|
} else {
|
|
mesh = new Mesh(buffergeometry, createdMaterials[0]);
|
|
}
|
|
}
|
|
mesh.name = object.name;
|
|
container.add(mesh);
|
|
}
|
|
console.timeEnd('OBJLoader');
|
|
return container;
|
|
}
|
|
});
|
|
return OBJLoader;
|
|
}
|
