310 lines
9.0 KiB
JavaScript
310 lines
9.0 KiB
JavaScript
var fs = require('fs');
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var mesh = require('./Mesh.js');
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var geo = {};
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geo.MeshStreamer = function(path, callback) {
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// Different parts of a obj (a mesh per material)
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this.meshes = [];
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// In meshes, vertices and texture coords are shared
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this.vertices = [];
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this.faces = [];
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this.normals = [];
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this.texCoords = [];
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// Chunk size
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this.chunk = 1000;
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if (path !== undefined) {
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var self = this;
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this.loadFromFile(path, function() {
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if (typeof callback === 'function')
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callback();
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});
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}
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}
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geo.MeshStreamer.prototype.loadFromFile = function(path, callback) {
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var self = this;
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fs.readFile(path, function(err, data) {
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var currentMesh;
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// Get lines from file
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var lines = data.toString('utf-8').split("\n");
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// For each line
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for (var i = 0; i < lines.length; i++) {
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var line = lines[i];
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if (line[0] === 'v') {
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if (line[1] === 't') {
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// Texture coord
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var texCoord = new mesh.TexCoord(line);
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texCoord.index = self.texCoords.length;
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self.texCoords.push(texCoord);
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} else if (line[1] === 'n') {
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var normal = new mesh.Normal(line);
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normal.index = self.normals.length;
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self.normals.push(normal);
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} else {
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// Just a simple vertex
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// if (currentMesh === undefined) {
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// // Chances are that we won't use any material in this case
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// currentMesh = new mesh.Mesh();
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// self.meshes.push(currentMesh);
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// }
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var vertex = new mesh.Vertex(line);
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vertex.index = self.vertices.length;
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self.vertices.push(vertex);
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}
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} else if (line[0] === 'f') {
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// Create mesh if it doesn't exist
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if (currentMesh === undefined) {
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currentMesh = new mesh.Mesh();
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self.meshes.push(currentMesh);
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}
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// Create faces (two if Face4)
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var faces = currentMesh.addFaces(line);
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faces[0].index = self.faces.length;
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self.faces.push(faces[0]);
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if (faces.length === 2) {
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faces[1].index = self.faces.length;
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self.faces.push(faces[1]);
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}
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} else if (line[0] === 'u') {
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// usemtl
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// If a current mesh exists, finish it
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// Create a new mesh
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currentMesh = new mesh.Mesh();
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self.meshes.push(currentMesh);
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currentMesh.material = (new mesh.Material(line)).name;
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// console.log(currentMesh.material);
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}
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}
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if (typeof callback === 'function') {
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callback();
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}
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});
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}
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geo.MeshStreamer.prototype.start = function(socket) {
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this.meshIndex = 0;
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var self = this;
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socket.on('request', function(path) {
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console.log('Asking for ' + path);
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var regex = /.*\.\..*/;
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if (regex.test(path)) {
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socket.emit('refused');
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socket.disconnect();
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return;
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}
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self.loadFromFile(path, function() {
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socket.emit('ok');
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});
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});
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socket.on('next', function(_camera) {
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var camera = {
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position: {
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x: _camera[0]*10,
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y: _camera[1]*10,
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z: _camera[2]*10
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},
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target: {
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x: _camera[3]*10,
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y: _camera[4]*10,
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z: _camera[5]*10
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}
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}
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var direction = {
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x: camera.target.x - camera.position.x,
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y: camera.target.y - camera.position.y,
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z: camera.target.z - camera.position.z
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}
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var norm = direction.x * direction.x + direction.y * direction.y + direction.z * direction.z;
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direction.x /= norm;
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direction.y /= norm;
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direction.z /= norm;
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// Send next elements
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var currentMesh = self.meshes[self.meshIndex];
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var currentFace;
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var data = [];
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var sent = 0;
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while (sent < 100) {
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if (currentMesh.faceIndex === -1) {
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// Must give usemtl
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data.push(['u', currentMesh.material, currentMesh.vertices.length, currentMesh.faces.length, self.texCoords.length > 0, self.normals.length > 0]);
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sent++;
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currentFace = currentMesh.faces[++currentMesh.faceIndex];
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} else if (currentMesh.isFinished()) {
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// Must switch to next mesh
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currentMesh = self.meshes[++self.meshIndex];
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// If not other mesh, we finished
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if (currentMesh === undefined) {
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socket.emit('elements', data);
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socket.disconnect();
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return;
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}
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data.push(['u', currentMesh.material, currentMesh.vertices.length, currentMesh.faces.length, self.texCoords.length > 0, self.normals.length > 0]);
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currentMesh.faceIndex++;
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sent++;
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continue;
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} else {
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currentFace = currentMesh.faces[++currentMesh.faceIndex];
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if (currentFace === undefined) {
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currentMesh = self.meshes[++self.meshIndex];
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if (currentMesh === undefined) {
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socket.emit('elements', data);
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socket.disconnect();
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return;
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}
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continue;
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}
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}
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var vertex1 = self.vertices[currentFace.a];
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var vertex2 = self.vertices[currentFace.b];
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var vertex3 = self.vertices[currentFace.c];
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var v1 = {
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x: vertex1.x - camera.position.x,
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y: vertex1.y - camera.position.y,
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z: vertex1.z - camera.position.z
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};
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var v2 = {
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x: vertex2.x - camera.position.x,
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y: vertex2.y - camera.position.y,
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z: vertex2.z - camera.position.z
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};
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var v3 = {
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x: vertex3.x - camera.position.x,
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y: vertex3.y - camera.position.y,
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z: vertex3.z - camera.position.z
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};
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norm = v1.x * v1.x + v1.y * v1.y + v1.z * v1.z;
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v1.x /= norm;
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v1.y /= norm;
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v1.z /= norm;
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norm = v2.x * v2.x + v2.y * v2.y + v2.z * v2.z;
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v2.x /= norm;
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v2.y /= norm;
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v2.z /= norm;
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norm = v3.x * v3.x + v3.y * v3.y + v3.z * v3.z;
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v3.x /= norm;
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v3.y /= norm;
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v3.z /= norm;
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if (
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direction.x * v1.x + direction.y * v1.y + direction.z * v1.z < 0 &&
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direction.x * v2.x + direction.y * v2.y + direction.z * v2.z < 0 &&
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direction.x * v3.x + direction.y * v3.y + direction.z * v3.z < 0
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) {
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currentFace.sent = false;
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continue;
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}
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if (!vertex1.sent) { data.push(vertex1.toList()); vertex1.sent = true; sent++;}
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if (!vertex2.sent) { data.push(vertex2.toList()); vertex2.sent = true; sent++;}
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if (!vertex3.sent) { data.push(vertex3.toList()); vertex3.sent = true; sent++;}
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var normal1 = self.normals[currentFace.aNormal];
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var normal2 = self.normals[currentFace.bNormal];
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var normal3 = self.normals[currentFace.cNormal];
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if (normal1 !== undefined && !normal1.sent) { data.push(normal1.toList()); normal1.sent = true; sent++;}
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if (normal2 !== undefined && !normal2.sent) { data.push(normal2.toList()); normal2.sent = true; sent++;}
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if (normal3 !== undefined && !normal3.sent) { data.push(normal3.toList()); normal3.sent = true; sent++;}
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var tex1 = self.texCoords[currentFace.aTexture];
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var tex2 = self.texCoords[currentFace.bTexture];
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var tex3 = self.texCoords[currentFace.cTexture];
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if (tex1 !== undefined && !tex1.sent) { data.push(tex1.toList()); tex1.sent = true; sent++;}
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if (tex2 !== undefined && !tex2.sent) { data.push(tex2.toList()); tex2.sent = true; sent++;}
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if (tex3 !== undefined && !tex3.sent) { data.push(tex3.toList()); tex3.sent = true; sent++;}
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currentFace.index = currentMesh.faceIndex;
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data.push(currentFace.toList(self.meshIndex)); currentFace.sent = true;
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sent++;
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}
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// console.log(self.meshIndex);
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// console.log(data);
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// Emit self.chunk faces (and the corresponding vertices if not emitted)
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socket.emit('elements', data);
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});
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}
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module.exports = geo;
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