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
|
function init() {
class Point {
constructor(x, y) {
this.x = x;
this.y = y;
}
add(that) {
return new Point(
this.x + that.x,
this.y + that.y
);
}
sub(that) {
return new Point(
this.x - that.x,
this.y - that.y
);
}
dist(that) {
let a = this.x - that.x;
let b = this.y - that.y;
return Math.sqrt(a * a + b * b)
}
}
class Face {
indices = [];
constructor(a, b, c, d) {
this.indices.push(a);
this.indices.push(b);
this.indices.push(c);
this.indices.push(d);
}
}
class Cloth {
VertexWeight = 1;
geometry = new THREE.Geometry();
faces = [];
vertexWeights = [];
springs = [];
getSprings(faceIndex) {
}
static CreateBasic(width, height, numPointsWidth, numPointsHeight) {
let vertices = [];
let faces = [];
let stepWidth = width / (numPointsWidth - 1);
let stepHeight = height / (numPointsHeight - 1);
for (let y = 0; y < numPointsHeight; y++) {
for (let x = 0; x < numPointsWidth; x++) {
vertices.push(
new THREE.Vector3(x * stepWidth, height - y * stepHeight, 0)
);
}
}
function getVertexIndex(x, y) {
return y * numPointsWidth + x;
}
for (let y = 0; y < numPointsHeight - 1; y++) {
for (let x = 0; x < numPointsWidth - 1; x++) {
faces.push(
new Face(
getVertexIndex(x, y),
getVertexIndex(x, y + 1),
getVertexIndex(x + 1, y),
getVertexIndex(x + 1, y + 1),
)
);
}
}
return this.CreateExplicit(vertices, faces);
}
static CreateExplicit(vertices, faces) {
let result = new Cloth();
for (let i in vertices) {
result.geometry.vertices.push(vertices[i]);
result.vertexWeights.push(0);
}
for (let i in faces) {
let face = faces[i];
result.geometry.faces.push(new THREE.Face3(
face.a, face.b, face.c
));
result.geometry.faces.push(new THREE.Face3(
face.c, face.b, face.d
));
let xLength =
result.geometry.vertices[face.b]
.sub(result.geometry.vertices[face.a])
.length();
let yLength =
result.geometry.vertices[face.c]
.sub(result.geometry.vertices[face.a])
.length();
let weight = xLength * yLength / 2;
xLength =
result.geometry.vertices[face.b]
.sub(result.geometry.vertices[face.d])
.length();
yLength =
result.geometry.vertices[face.c]
.sub(result.geometry.vertices[face.d])
.length();
weight += xLength * yLength / 2;
result.vertexWeights[face.a] += weight / 4;
result.vertexWeights[face.b] += weight / 4;
result.vertexWeights[face.c] += weight / 4;
result.vertexWeights[face.d] += weight / 4;
}
result.geometry.computeBoundingSphere();
return result;
}
}
let mousePos = new Point();
const canvasSpace = 200;
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / (window.innerHeight - canvasSpace), 0.1, 1000);
const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight - canvasSpace);
document.getElementById("threejscontainer").appendChild(renderer.domElement);
const directionalLight = new THREE.DirectionalLight(0xffffff, 1);
scene.add(directionalLight);
let cloth = Cloth.CreateBasic(10, 10, 4, 4);
const material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });
const mesh = new THREE.Mesh(cloth.geometry, material);
scene.add(mesh);
camera.position.y = 5;
camera.position.z = 10;
function animate(dt) {
requestAnimationFrame(animate);
renderer.render(scene, camera);
}
let canvas = document.getElementsByTagName("canvas")[0];
let resize = function () {
w = window.innerWidth;
h = window.innerHeight - 200;
canvas.width = w;
canvas.height = h;
}
window.onresize = resize;
resize();
if (canvas.getContext) {
ctx = canvas.getContext('2d');
animate(performance.now());
}
canvas.onmousemove = (evt) => {
mousePos.x = evt.clientX;
mousePos.y = evt.clientY;
};
}
|
