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annotate Resources/Nexus/js/nexus_three.js @ 45:967f947014ac nexus

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adding experimental support for nexus models
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 09 Apr 2024 22:13:01 +0200
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1 function NexusObject(url, renderer, render, material) {
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2 var gl = renderer.context;
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3 var geometry = new THREE.BufferGeometry();
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4 var positions = new Float32Array(3);
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5
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6
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7 geometry.addAttribute('position', new THREE.BufferAttribute(positions, 3));
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8
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9
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10 if(!material)
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11 this.autoMaterial = true;
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12
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13 THREE.Mesh.call( this, geometry, material);
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14 this.frustumCulled = false;
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15
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16 var mesh = this;
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17 var instance = this.instance = new Nexus.Instance(gl);
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18 instance.open(url);
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19 instance.onLoad = function() {
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20 var s = 1/instance.mesh.sphere.radius;
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21 var pos = instance.mesh.sphere.center;
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22 mesh.position.set(-pos[0]*s, -pos[1]*s, -pos[2]*s);
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23 mesh.scale.set(s, s, s);
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24 if(mesh.autoMaterial)
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25 mesh.material = new THREE.MeshLambertMaterial( { color: 0xffffff } );
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26
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27 if(this.mesh.vertex.normal) {
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28 var normals = new Float32Array(3);
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29 geometry.addAttribute( 'normal', new THREE.BufferAttribute(normals, 3));
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30 }
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31 if(this.mesh.vertex.color) {
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32 var colors = new Float32Array(4);
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33 geometry.addAttribute( 'color', new THREE.BufferAttribute(colors, 4));
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34 if(mesh.autoMaterial)
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35 mesh.material = new THREE.MeshLambertMaterial({ vertexColors: THREE.VertexColors });
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36 }
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37
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38 if(this.mesh.vertex.texCoord) {
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39 var uv = new Float32Array(2);
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40 geometry.addAttribute( 'uv', new THREE.BufferAttribute(uv, 2));
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41 if(mesh.autoMaterial) {
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42 var texture = new THREE.DataTexture( new Uint8Array([1, 1, 1]), 1, 1, THREE.RGBFormat );
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43 texture.needsUpdate = true;
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44 mesh.material = new THREE.MeshLambertMaterial( { color: 0xffffff, map: texture } );
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45 }
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46 }
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47
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48 if(this.mesh.face.index) {
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49 var indices = new Uint32Array(3);
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50 geometry.setIndex(new THREE.BufferAttribute( indices, 3) );
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51 }
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52 render();
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53 };
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54 instance.onUpdate = function() { render(); }
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55
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56 this.onAfterRender = function(renderer, scene, camera, geometry, material, group) {
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57 if(!instance.isReady) return;
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58 var s = renderer.getSize();
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59 instance.updateView([0, 0, s.width, s.height],
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60 camera.projectionMatrix.elements,
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61 mesh.modelViewMatrix.elements);
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62 var program = renderer.context.getParameter(gl.CURRENT_PROGRAM);
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63 instance.attributes['position'] = renderer.context.getAttribLocation(program, "position");
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64 instance.attributes['normal'] = renderer.context.getAttribLocation(program, "normal");
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65 instance.attributes['color'] = renderer.context.getAttribLocation(program, "color");
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66 instance.attributes['uv'] = renderer.context.getAttribLocation(program, "uv");
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67
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68 instance.render();
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69 }
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70 }
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71
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72 NexusObject.prototype = Object.create(THREE.Mesh.prototype);
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73
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74 NexusObject.prototype.raycast = function(raycaster, intersects) {
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75 var instance = this.instance;
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76 var nexus = instance.mesh;
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77 if(!nexus.sphere) return;
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78 var sp = nexus.sphere;
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79 var c = sp.center;
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80 var center = new THREE.Vector3(c[0], c[1], c[2]);
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81 var sphere = new THREE.Sphere(center, sp.radius);
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82 sphere.applyMatrix4( this.matrixWorld );
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83
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84 if ( raycaster.ray.intersectsSphere( sphere ) === false ) return;
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85 //just check the last level spheres.
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86 if(!nexus.sink) return;
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87
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88 var distance = -1.0;
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89 for(var i = 0; i < nexus.sink; i++) {
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90 var patch = nexus.nfirstpatch[i];
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91 if(nexus.patches[patch*3] != nexus.sink)
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92 continue;
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93 var x = nexus.nspheres[i*5];
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94 var y = nexus.nspheres[i*5+1];
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95 var z = nexus.nspheres[i*5+2];
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96 var r = nexus.nspheres[i*5+4]; //tight radius
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97 var sphere = new THREE.Sphere(new THREE.Vector3(x, y, z), r);
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98 sphere.applyMatrix4( this.matrixWorld );
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99 if ( raycaster.ray.intersectsSphere( sphere ) != false ) {
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100 var d = sphere.center.lengthSq();
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101 if(distance == -1.0 || d < distance)
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102 distance = d;
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103 }
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104 }
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105 if(distance == -1.0) return;
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106
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107 intersects.push({ distance: distance, object: this} );
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108 }