-
-
Notifications
You must be signed in to change notification settings - Fork 257
/
edgeIntersect.js
207 lines (151 loc) · 5.34 KB
/
edgeIntersect.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
import Stats from 'stats.js';
import * as dat from 'dat.gui';
import * as THREE from 'three';
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js';
import { acceleratedRaycast, computeBoundsTree, disposeBoundsTree, SAH } from '..';
THREE.Mesh.prototype.raycast = acceleratedRaycast;
THREE.BufferGeometry.prototype.computeBoundsTree = computeBoundsTree;
THREE.BufferGeometry.prototype.disposeBoundsTree = disposeBoundsTree;
const params = {
position: new THREE.Vector3(),
rotation: new THREE.Euler(),
scale: new THREE.Vector3( 1, 1, 1 ),
speed: 1,
displayMeshes: false,
distance: 1.1,
};
let stats;
let scene, camera, renderer, orbitControls;
let mesh1, mesh2, lineGroup, line, bgLine;
let lastTime = window.performance.now();
init();
render();
function init() {
const bgColor = 0x66093a;
// renderer setup
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setClearColor( bgColor, 1 );
renderer.outputEncoding = THREE.sRGBEncoding;
document.body.appendChild( renderer.domElement );
// scene setup
scene = new THREE.Scene();
scene.fog = new THREE.Fog( 0x263238 / 2, 20, 60 );
const light = new THREE.DirectionalLight( 0xffffff, 0.5 );
light.position.set( 1, 1, 1 );
scene.add( light );
scene.add( new THREE.AmbientLight( 0xffffff, 0.4 ) );
// geometry setup
const radius = 1;
const tube = 0.4;
const tubularSegments = 100;
const radialSegments = 40;
const geometry = new THREE.TorusKnotBufferGeometry( radius, tube, tubularSegments, radialSegments );
const material = new THREE.MeshPhongMaterial( {
color: 0xffffff,
side: THREE.DoubleSide,
shininess: 0.01,
polygonOffset: true,
polygonOffsetFactor: 1,
polygonOffsetUnits: 1,
} );
// const geometry = new THREE.BoxBufferGeometry();
// const geometry = new THREE.BufferGeometry();
// geometry.setFromPoints( [
// new THREE.Vector3( 1, 0, 0 ),
// new THREE.Vector3( - 1, 0, 0 ),
// new THREE.Vector3( 0, 1, 0 ),
// ] );
// geometry.computeVertexNormals();
geometry.computeBoundsTree( { maxLeafTris: 1, strategy: SAH } );
mesh1 = new THREE.Mesh( geometry, material );
mesh2 = new THREE.Mesh( geometry, material );
scene.add( mesh1, mesh2 );
const lineGeometry = new THREE.BufferGeometry();
lineGeometry.setFromPoints( [ new THREE.Vector3( 0, 1, 0 ), new THREE.Vector3( 0, - 1, 0 ) ] );
line = new THREE.LineSegments( lineGeometry, new THREE.LineBasicMaterial( { color: 0xE91E63 } ) );
bgLine = line.clone();
bgLine.material = new THREE.LineBasicMaterial( { color: 0xE91E63, transparent: true, opacity: 0.25, depthTest: false } );
lineGroup = new THREE.Group();
lineGroup.add( line, bgLine );
scene.add( lineGroup );
// camera setup
camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 50 );
camera.position.set( 2, 2, 2 );
camera.far = 100;
camera.updateProjectionMatrix();
orbitControls = new OrbitControls( camera, renderer.domElement );
// stats setup
stats = new Stats();
document.body.appendChild( stats.dom );
const gui = new dat.GUI();
gui.add( params, 'speed', 0, 10, 0.001 );
gui.add( params, 'distance', 0, 1.5, 0.001 );
gui.add( params, 'displayMeshes' );
gui.open();
window.addEventListener( 'resize', function () {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}, false );
}
function render() {
requestAnimationFrame( render );
const delta = window.performance.now() - lastTime;
lastTime = window.performance.now();
mesh1.position.y = - params.distance;
mesh1.rotation.x -= delta * 3 * 0.0001 * params.speed * 0.5;
mesh1.rotation.y -= delta * 1 * 0.0001 * params.speed * 0.5;
mesh1.rotation.z -= delta * 2 * 0.0001 * params.speed * 0.5;
mesh2.position.y = params.distance;
mesh2.rotation.x += delta * 0.0001 * params.speed;
mesh2.rotation.y += delta * 2 * 0.0001 * params.speed;
mesh2.rotation.z += delta * 3 * 0.0001 * params.speed;
mesh1.updateMatrixWorld();
mesh2.updateMatrixWorld();
const matrix2to1 = new THREE.Matrix4()
.copy( mesh1.matrixWorld )
.invert()
.multiply( mesh2.matrixWorld );
const edge = new THREE.Line3();
const results = [];
mesh1.geometry.boundsTree.bvhcast( mesh2.geometry.boundsTree, matrix2to1, {
intersectsTriangles( triangle1, triangle2 ) {
if ( triangle1.intersectsTriangle( triangle2, edge ) ) {
const { start, end } = edge;
results.push(
start.x,
start.y,
start.z,
end.x,
end.y,
end.z,
);
}
}
} );
if ( results.length ) {
const geometry = line.geometry;
const posArray = geometry.attributes.position.array;
if ( posArray.length < results.length ) {
geometry.dispose();
geometry.setAttribute( 'position', new THREE.BufferAttribute( new Float32Array( results ), 3, false ) );
} else {
posArray.set( results );
}
geometry.setDrawRange( 0, results.length / 3 );
geometry.attributes.position.needsUpdate = true;
lineGroup.position.copy( mesh1.position );
lineGroup.rotation.copy( mesh1.rotation );
lineGroup.scale.copy( mesh1.scale );
lineGroup.visible = true;
} else {
lineGroup.visible = false;
}
mesh1.visible = params.displayMeshes;
mesh2.visible = params.displayMeshes;
renderer.render( scene, camera );
stats.begin();
stats.end();
}