webgl实现canvas粒子球旋转动画效果代码
代码语言：html
所属分类：粒子
代码描述：webgl实现canvas粒子球旋转动画效果代码
下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开
<html lang="en"><head>
<meta charset="UTF-8">
<style>
* {
padding: 0;
margin: 0;
overflow: hidden;
}
</style>
</head>
<body translate="no">
<script id="vs" type="x-shader/x-vertex">
attribute vec3 position;
attribute vec4 color;
uniform mat4 mvpMatrix;
uniform float pointSize;
varying vec4 vColor;
void main(void){
vColor = color;
gl_Position = mvpMatrix * vec4(position, 1.0);
gl_PointSize = pointSize;
}
</script>
<script id="fs" type="x-shader/x-fragment">
precision mediump float;
varying vec4 vColor;
void main(void){
gl_FragColor = vColor;
}
</script>
<script type="module">
export class Mat4 {
static create(){
return new Float32Array(16);
}
static identity(source){
let out = source;
if(out == null){out = Mat4.create();}
out[0] = 1; out[1] = 0; out[2] = 0; out[3] = 0;
out[4] = 0; out[5] = 1; out[6] = 0; out[7] = 0;
out[8] = 0; out[9] = 0; out[10] = 1; out[11] = 0;
out[12] = 0; out[13] = 0; out[14] = 0; out[15] = 1;
return out;
}
static copy(target, source){
let out = source;
if(target == null){
throw new Error('Mat4.copy: invalid argument');
}
if(out == null){out = Mat4.create();}
out[0] = target[0]; out[1] = target[1]; out[2] = target[2]; out[3] = target[3];
out[4] = target[4]; out[5] = target[5]; out[6] = target[6]; out[7] = target[7];
out[8] = target[8]; out[9] = target[9]; out[10] = target[10]; out[11] = target[11];
out[12] = target[12]; out[13] = target[13]; out[14] = target[14]; out[15] = target[15];
return out;
}
static multiply(mat0, mat1, source){
let out = source;
if(out == null){out = Mat4.create();}
let a = mat0[0], b = mat0[1], c = mat0[2], d = mat0[3],
e = mat0[4], f = mat0[5], g = mat0[6], h = mat0[7],
i = mat0[8], j = mat0[9], k = mat0[10], l = mat0[11],
m = mat0[12], n = mat0[13], o = mat0[14], p = mat0[15],
A = mat1[0], B = mat1[1], C = mat1[2], D = mat1[3],
E = mat1[4], F = mat1[5], G = mat1[6], H = mat1[7],
I = mat1[8], J = mat1[9], K = mat1[10], L = mat1[11],
M = mat1[12], N = mat1[13], O = mat1[14], P = mat1[15];
out[0] = A * a + B * e + C * i + D * m;
out[1] = A * b + B * f + C * j + D * n;
out[2] = A * c + B * g + C * k + D * o;
out[3] = A * d + B * h + C * l + D * p;
out[4] = E * a + F * e + G * i + H * m;
out[5] = E * b + F * f + G * j + H * n;
out[6] = E * c + F * g + G * k + H * o;
out[7] = E * d + F * h + G * l + H * p;
out[8] = I * a + J * e + K * i + L * m;
out[9] = I * b + J * f + K * j + L * n;
out[10] = I * c + J * g + K * k + L * o;
out[11] = I * d + J * h + K * l + L * p;
out[12] = M * a + N * e + O * i + P * m;
out[13] = M * b + N * f + O * j + P * n;
out[14] = M * c + N * g + O * k + P * o;
out[15] = M * d + N * h + O * l + P * p;
return out;
}
static scale(mat, vec, source){
let out = source;
if(out == null){out = Mat4.create();}
out[0] = mat[0] * vec[0];
out[1] = mat[1] * vec[0];
out[2] = mat[2] * vec[0];
out[3] = mat[3] * vec[0];
out[4] = mat[4] * vec[1];
out[5] = mat[5] * vec[1];
out[6] = mat[6] * vec[1];
out[7] = mat[7] * vec[1];
out[8] = mat[8] * vec[2];
out[9] = mat[9] * vec[2];
out[10] = mat[10] * vec[2];
out[11] = mat[11] * vec[2];
out[12] = mat[12];
out[13] = mat[13];
out[14] = mat[14];
out[15] = mat[15];
return out;
}
static translate(mat, vec, source){
let out = source;
if(out == null){out = Mat4.create();}
out[0] = mat[0]; out[1] = mat[1]; out[2] = mat[2]; out[3] = mat[3];
out[4] = mat[4]; out[5] = mat[5]; out[6] = mat[6]; out[7] = mat[7];
out[8] = mat[8]; out[9] = mat[9]; out[10] = mat[10]; out[11] = mat[11];
out[12] = mat[0] * vec[0] + mat[4] * vec[1] + mat[8] * vec[2] + mat[12];
out[13] = mat[1] * vec[0] + mat[5] * vec[1] + mat[9] * vec[2] + mat[13];
out[14] = mat[2] * vec[0] + mat[6] * vec[1] + mat[10] * vec[2] + mat[14];
out[15] = mat[3] * vec[0] + mat[7] * vec[1] + mat[11] * vec[2] + mat[15];
return out;
}
static rotate(mat, angle, axis, source){
let out = source;
if(out == null){out = Mat4.create();}
let sq = Math.sqrt(axis[0] * axis[0] + axis[1] * axis[1] + axis[2] * axis[2]);
if(!sq){return null;}
let a = axis[0], b = axis[1], c = axis[2];
if(sq != 1){sq = 1 / sq; a *= sq; b *= sq; c *= sq;}
let d = Math.sin(angle), e = Math.cos(angle), f = 1 - e,
g = mat[0], h = mat[1], i = mat[2], j = mat[3],
k = mat[4], l = mat[5], m = mat[6], n = mat[7],
o = mat[8], p = mat[9], q = mat[10], r = mat[11],
s = a * a * f + e,
t = b * a * f + c * d,
u = c * a * f - b * d,
v = a * b * f - c * d,
w = b * b * f + e,
x = c * b * f + a * d,
y = a * c * f + b * d,
z = b * c * f - a * d,
A = c * c * f + e;
if(angle){
if(mat != out){
out[12] = mat[12]; out[13] = mat[13];
out[14] = mat[14]; out[15] = mat[15];
}
}else{
out = mat;
}
out[0] = g * s + k * t + o * u;
out[1] = h * s + l * t + p * u;
out[2] = i * s + m * t + q * u;
out[3] = j * s + n * t + r * u;
out[4] = g * v + k * w + o * x;
out[5] = h * v + l * w + p * x;
out[6] = i * v + m * w + q * x;
out[7] = j * v + n * w + r * x;
out[8] = g * y + k * z + o * A;
out[9] = h * y + l * z + p * A;
out[10] = i * y + m * z + q * A;
out[11] = j * y + n * z + r * A;
return out;
}
static lookAt(eye, center, up, source){
let eyeX = eye[0], eyeY = eye[1], eyeZ = eye[2],
centerX = center[0], centerY = center[1], centerZ = center[2],
upX = up[0], upY = up[1], upZ = up[2];
if(eyeX == centerX && eyeY == centerY && eyeZ == centerZ){return Mat4.identity(source);}
let out = source;
if(out == null){out = Mat4.create();}
let x0, x1, x2, y0, y1, y2, z0, z1, z2, l;
z0 = eyeX - center[0]; z1 = eyeY - center[1]; z2 = eyeZ - center[2];
l = 1 / Math.sqrt(z0 * z0 + z1 * z1 + z2 * z2);
z0 *= l; z1 *= l; z2 *= l;
x0 = upY * z2 - upZ * z1;
x1 = upZ * z0 - upX * z2;
x2 = upX * z1 - upY * z0;
l = Math.sqrt(x0 * x0 + x1 * x1 + x2 * x2);
if(!l){
x0 = 0; x1 = 0; x2 = 0;
}else{
l = 1 / l;
x0 *= l; x1 *= l; x2 *= l;
}
y0 = z1 * x2 - z2 * x1; y1 = z2 * x0 - z0 * x2; y2 = z0 * x1 - z1 * x0;
l = Math.sqrt(y0 * y0 + y1 * y1 + y2 * y2);
if(!l){
y0 = 0; y1 = 0; y2 = 0;
}else{
l = 1 / l;
y0 *= l; y1 *= l; y2 *= l;
}
out[0] = x0; out[1] = y0; out[2] = z0; out[3] = 0;
out[4] = x1; out[5] = y1; out[6] = z1; out[7] = 0;
out[8] = x2; out[9] = y2; out[10] = z2; out[11] = 0;
out[12] = -(x0 * eyeX + x1 * eyeY + x2 * eyeZ);
out[13] = -(y0 * eyeX + y1 * eyeY + y2 * eyeZ);
out[14] = -(z0 * eyeX + z1 * eyeY + z2 * eyeZ);
out[15] = 1;
return out;
}
static perspective(fovy, aspect, near, far, source){
let out = source;
if(out == null){out = Mat4.create();}
let t = near * Math.tan(fovy * Math.PI / 360);
let r = t * aspect;
let a = r * 2, b = t * 2, c = far - near;
out[0] = near * 2 / a;
out[1] = 0;
out[2] = 0;
out[3] = 0;
out[4] = 0;
out[5] = near * 2 / b;
out[6] = 0;
out[7] = 0;
out[8] = 0;
out[9] = 0;
out[10] = -(far + near) / c;
out[11] = -1;
out[12] = 0;
out[13] = 0;
out[14] = -(far * near * 2) / c;
out[15] = 0;
return out;
}
static ortho(left, right, top, bottom, near, far, source){
let out = source;
if(out == null){out = Mat4.create();}
let h = (right - left);
let v = (top - bottom);
let d = (far - near);
out[0] = 2 / h;
out[1] = 0;
out[2] = 0;
out[3] = 0;
out[4] = 0;
out[5] = 2 / v;
out[6] = 0;
out[7] = 0;
out[8] = 0;
out[9] = 0;
out[10] = -2 / d;
out[11] = 0;
out[12] = -(left + right) / h;
out[13] = -(top + bottom) / v;
out[14] = -(far + near) / d;
out[15] = 1;
return out;
}
static transpose(mat, source){
let out = source;
if(out == null){out = Mat4.create();}
out[0] = mat[0]; out[1] = mat[4];
out[2] = mat[8]; out[3] = mat[12];
out[4] = mat[1]; out[5] = mat[5];
out[6] = mat[9]; out[7] = mat[13];
out[8] = mat[2]; out[9] = mat[6];
out[10] = mat[10]; out[11] = mat[14];
out[12] = mat[3]; out[13] = mat[7];
out[14] = mat[11]; out[15] = mat[15];
return out;
}
static inverse(mat, source){
let out = source;
if(out == null){out = Mat4.create();}
let a = mat[0], b = mat[1], c = mat[2], d = mat[3],
e = mat[4], f = mat[5], g = mat[6], h = mat[7],
i = mat[8], j = mat[9], k = mat[10], l = mat[11],
m = mat[12], n = mat[13], o = mat[14], p = mat[15],
q = a * f - b * e, r = a * g - c * e,
s = a * h - d * e, t = b * g - c * f,
u = b * h - d * f, v = c * h - d * g,
w = i * n - j * m, x = i * o - k * m,
y = i * p - l * m, z = j * o - k * n,
A = j * p - l * n, B = k * p - l * o,
ivd = 1 / (q * B - r * A + s * z + t * y - u * x + v * w);
out[0] = ( f * B - g * A + h * z) * ivd;
out[1] = (-b * B + c * A - d * z) * ivd;
out[2] = ( n * v - o * u + p * t) * ivd;
out[3] = (-j * v + k * u - l * t) * ivd;
out[4] = (-e * B + g * y - h * x) * ivd;
out[5] = ( a * B - c * y + d * x) * ivd;
out[6] = (-m * v + o * s - p * r) * ivd;
out[7] = ( i * v - k * s + l * r) * ivd;
out[8] = ( e * A - f * y + h * w) * ivd;
out[9] = (-a * A + b * y - d * w) * ivd;
out[10] = ( m * u - n * s + p * q) * ivd;
out[11] = (-i * u + j * s - l * q) * ivd;
out[12] = (-e * z + f * x - g * w) * ivd;
out[13] = ( a * z - b * x + c * w) * ivd;
out[14] = (-m * t + n * r - o * q) * ivd;
out[15] = ( i * t - j * r + k * q) * ivd;
return out;
}
static toVecIV(mat, vec){
let a = mat[0], b = mat[1], c = mat[2], d = mat[3],
e = mat[4], f = mat[5], g = mat[6], h = mat[7],
i = mat[8], j = mat[9], k = mat[10], l = mat[11],
m = mat[12], n = mat[13], o = mat[14], p = mat[15];
let x = vec[0], y = vec[1], z = vec[2], w = vec[3];
let out = [];
out[0] = x * a + y * e + z * i + w * m;
out[1] = x * b + y * f + z * j + w * n;
out[2] = x * c + y * g + z * k + w * o;
out[3] = x * d + y * h + z * l + w * p;
vec = out;
return out;
}
static vpFromCameraProperty(position, centerPoint, upDirection, fovy, aspect, near, far, vmat, pmat, vpmat){
Mat4.lookAt(position, centerPoint, upDirection, vmat);
Mat4.perspective(fovy, aspect, near, far, pmat);
Mat4.multiply(pmat, vmat, vpmat);
return {
view: vmat,
projection: pmat,
viewProjection: vpmat,
};
}
static screenPositionFromMvp(mat, vec, width, height){
let halfWidth = width * 0.5;
let halfHeight = height * 0.5;
let v = Mat4.toVecIV(mat, [vec[0], vec[1], vec[2], 1.0]);
if(v[3] <= 0.0){return [NaN, NaN];}
v[0] /= v[3]; v[1] /= v[3]; v[2] /= v[3];
return [
halfWidth + v[0] * halfWidth,
halfHeight - v[1] * halfHeight
];
}
static compose(translation, qtn, scale, source){
let out = source;
if(out == null){out = Mat4.create();}
let x = qtn[0], y = qtn[1], z = qtn[2], w = qtn[3];
let x2 = x + x, y2 = y + y, z2 = z + z;
let xx = x * x2, xy = x * y2, xz = x * z2;
let yy = y * y2, yz = y * z2, zz = z * z2;
let wx = w * x2, wy = w * y2, wz = w * z2;
let sx = scale[0], sy = scale[1], sz = scale[2];
out[0] = (1 - (yy + zz)) * sx;
out[1] = (xy + wz) * sx;
out[2] = (xz - wy) * sx;
out[3] = 0;
out[4] = (xy - wz) * sy;
out[5] = (1 - (xx + zz)) * sy;
out[6] = (yz + wx) * sy;
out[7] = 0;
out[8] = (xz + wy) * sz;
out[9] = (yz - wx) * sz;
out[10] = (1 - (xx + yy)) * sz;
out[11] = 0;
out[12] = translation[0];
out[13] = translation[1];
out[14] = translation[2];
out[15] = 1;
return out;
}
}
export class Vec3 {
static create(){
return new Float32Array(3);
}
static copy(target, source){
let out = source;
if(target == null){
throw new Error('Vec3.copy: invalid argument');
}
if(out == null){out = Vec3.create();}
out[0] = target[0];
out[1] = target[1];
out[2] = target[2];
return out;
}
static length(v){
return Math.sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2]);
}
static distance(v0, v1){
let out = Vec3.create();
out[0] = v1[0] - v0[0];
out[1] = v1[1] - v0[1];
out[2] = v1[2] - v0[2];
return out;
}
static normalize(v){
let out = Vec3.create();
let l = Vec3.length(v);
if(l > 0){
let e = 1.0 / l;
out[0] = v[0] * e;
out[1] = v[1] * e;
out[2] = v[2] * e;
}else{
out[0] = 0.0;
out[1] = 0.0;
out[2] = 0.0;
}
return out;
}
static dot(v0, v1){
return v0[0] * v1[0] + v0[1] * v1[1] + v0[2] * v1[2];
}
static cross(v0, v1){
let out = Vec3.create();
out[0] = v0[1] * v1[2] - v0[2] * v1[1];
out[1] = v0[2] * v1[0] - v0[0] * v1[2];
out[2] = v0[0] * v1[1] - v0[1] * v1[0];
return out;
}
static faceNormal(v0, v1, v2){
let out = Vec3.create();
let vec1 = [v1[0] - v0[0], v1[1] - v0[1], v1[2] - v0[2]];
let vec2 = [v2[0] - v0[0], v2[1] - v0[1], v2[2] - v0[2]];
out[0] = vec1[1] * vec2[2] - vec1[2] * vec2[1];
out[1] = vec1[2] * vec2[0] - vec1[0] * vec2[2];
out[2] = vec1[0] * vec2[1] - vec1[1] * vec2[0];
return Vec3.normalize(out);
}
}
export class Vec2 {
/**
* ２つの要素を持つベクトルを生成する
* @return {Float32Array} ベクトル格納用の配列
*/
static create(){
return new Float32Array(2);
}
static copy(target, source){
let out = source;
if(target == null){
throw new Error('Vec2.copy: invalid argument');
}
if(out == null){out = Vec2.create();}
out[0] = target[0];
out[1] = target[1];
return out;
}
static length(v){
return Math.sqrt(v[0] * v[0] + v[1] * v[1]);
}
static distance(v0, v1){
let out = Vec2.create();
out[0] = v1[0] - v0[0];
out[1] = v1[1] - v0[1];
return out;
}
static normalize(v){
let out = Vec2.create();
let l = Vec2.length(v);
if(l > 0){
let e = 1.0 / l;
out[0] = v[0] * e;
out[1] = v[1] * e;
}
return out;
}
static dot(v0, v1){
return v0[0] * v1[0] + v0[1] * v1[1];
}
static cross(v0, v1){
return v0[0] * v1[1] - v0[1] * v1[0];
}
}
export class Qtn {
static create(){
return new Float32Array(4);
}
static identity(source){
let out = source;
if(out == null){out = Qtn.create();}
out[0] = 0; out[1] = 0; out[2] = 0; out[3] = 1;
return out;
}
static copy(target, source){
let out = source;
if(target == null){
throw new Error('Qtn.copy: invalid argument');
}
if(out == null){out = Qtn.create();}
out[0] = target[0];
out[1] = target[1];
out[2] = target[2];
out[3] = target[3];
return out;
}
static inverse(qtn, source){
let out = source;
if(out == null){out = Qtn.create();}
out[0] = -qtn[0];
out[1] = -qtn[1];
out[2] = -qtn[2];
out[3] = qtn[3];
return out;
}
static normalize(source){
let x = source[0], y = source[1], z = source[2];
let l = Math.sqrt(x * x + y * y + z * z);
if(l === 0){
source[0] = 0;
source[1] = 0;
source[2] = 0;
}else{
l = 1 / l;
source[0] = x * l;
source[1] = y * l;
source[2] = z * l;
}
return source;
}
static multiply(qtn0, qtn1, source){
let out = source;
if(out == null){out = Qtn.create();}
let ax = qtn0[0], ay = qtn0[1], az = qtn0[2], aw = qtn0[3];
let bx = qtn1[0], by = qtn1[1], bz = qtn1[2], bw = qtn1[3];
out[0] = ax * bw + aw * bx + ay * bz - az * by;
out[1] = ay * bw + aw * by + az * bx - ax * bz;
out[2] = az * bw + aw * bz + ax * by - ay * bx;
out[3] = aw * bw - ax * bx - ay * by - az * bz;
return out;
}
static rotate(angle, axis, source){
let out = source;
if(out == null){out = Qtn.create();}
let a = axis[0], b = axis[1], c = axis[2];
let sq = Math.sqrt(axis[0] * axis[0] + axis[1] * axis[1] + axis[2] * axis[2]);
if(sq !== 0){
let l = 1 / sq;
a *= l;
b *= l;
c *= l;
}
let s = Math.sin(angle * 0.5);
out[0] = a * s;
out[1] = b * s;
out[2] = c * s;
out[3] = Math.cos(angle * 0.5);
return out;
}
static toVecIII(vec, qtn, source){
let out = source;
if(out == null){out = Vec3.create();}
let qp = Qtn.create();
let qq = Qtn.create();
let qr = Qtn.create();
Qtn.inverse(qtn, qr);
qp[0] = vec[0];
qp[1] = vec[1];
qp[2] = vec[2];
Qtn.multiply(qr, qp, qq);
Qtn.multiply(qq, qtn, qr);
out[0] = qr[0];
out[1] = qr[1];
out[2] = qr[2];
return out;
}
static toMatIV(qtn, source){
let out = source;
if(out == null){out = Mat4.create();}
let x = qtn[0], y = qtn[1], z = qtn[2], w = qtn[3];
let x2 = x + x, y2 = y + y, z2 = z + z;
let xx = x * x2, xy = x * y2, xz = x * z2;
let yy = y * y2, yz = y * z2, zz = z * z2;
let wx = w * x2, wy = w * y2, wz = w * z2;
out[0] = 1 - (yy + zz);
out[1] = xy - wz;
out[2] = xz + wy;
out[3] = 0;
out[4] = xy + wz;
out[5] = 1 - (xx + zz);
out[6] = yz - wx;
out[7] = 0;
out[8] = xz - wy;
out[9] = yz + wx;
out[10] = 1 - (xx + yy);
out[11] = 0;
out[12] = 0;
out[13] = 0;
out[14] = 0;
out[15] = 1;
return out;
}
static slerp(qtn0, qtn1, time, source){
let out = source;
if(out == null){out = Qtn.create();}
let ht = qtn0[0] * qtn1[0] + qtn0[1] * qtn1[1] + qtn0[2] * qtn1[2] + qtn0[3] * qtn1[3];
let hs = 1.0 - ht * ht;
if(hs <= 0.0){
out[0] = qtn0[0];
out[1] = qtn0[1];
out[2] = qtn0[2];
out[3] = qtn0[3];
}else{
hs = Math.sqrt(hs);
if(Math.abs(hs) < 0.0001){
out[0] = (qtn0[0] * 0.5 + qtn1[0] * 0.5);
out[1] = (qtn0[1] * 0.5 + qtn1[1] * 0.5);
out[2] = (qtn0[2] * 0.5 + qtn1[2] * 0.5);
out[3] = (qtn0[3] * 0.5 + qtn1[3] * 0.5);
}else{
let ph = Math.acos(ht);
let pt = ph * time;
let t0 = Math.sin(ph - pt) / hs;
let t1 = Math.sin(pt) / hs;
out[0] = qtn0[0] * t0 + qtn1[0] * t1;
out[1] = qtn0[1] * t0 + qtn1[1] * t1;
out[2] = qtn0[2] * t0 + qtn1[2] * t1;
out[3] = qtn0[3] * t0 + qtn1[3] * t1;
}
}
return out;
}
}
/**
* Geometry
* @class Geometry
*/
export class Geometry {
/**
* 板ポリゴンの頂点情報を生成する
* @param {number} width - 板ポリゴンの一辺の幅
* @param {number} height - 板ポリゴンの一辺の高さ
* @param {Array.<number>} color - RGBA を 0.0 から 1.0 の範囲で指定した配列
* @return {object}
* @property {Array.<number>} position - 頂点座標
* @property {Array.<number>} normal - 頂点法線
* @property {Array.<number>} color - 頂点カラー
* @property {Array.<number>} texCoord - テクスチャ座標
* @property {Array.<number>} index - 頂点インデックス（gl.TRIANGLES）
* @example
* let planeData = Geometry.plane(2.0, 2.0, [1.0, 1.0, 1.0, 1.0]);
*/
static plane(width, height, color){
let w, h;
w = width / 2;
h = height / 2;
let pos = [
-w, h, 0.0,
w, h, 0.0,
-w, -h, 0.0,
w, -h, 0.0
];
let nor = [
0.0, 0.0, 1.0,
0.0, 0.0, 1.0,
0.0, 0.0, 1.0,
0.0, 0.0, 1.0
];
let col = [
color[0], color[1], color[2], color[3],
color[0], color[1], color[2], color[3],
color[0], color[1], color[2], color[3],
color[0], color[1], color[2], color[3]
];
let st = [
0.0, 0.0,
1.0, 0.0,
0.0, 1.0,
1.0, 1.0
];
let idx = [
0, 1, 2,
2, 1, 3
];
return {position: pos, normal: nor, color: col, texCoord: st, index: idx}
}
/**
* 円（XY 平面展開）の頂点情報を生成する
* @param {number} split - 円の円周の分割数
* @param {number} rad - 円の半径
* @param {Array.<number>} color - RGBA を 0.0 から 1.0 の範囲で指定した配列
* @return {object}
* @property {Array.<number>} position - 頂点座標
* @property {Array.<number>} normal - 頂点法線
* @property {Array.<number>} color - 頂点カラー
* @property {Array.<number>} texCoord - テクスチャ座標
* @property {Array.<number>} index - 頂点インデックス（gl.TRIANGLES）
* @example
* let circleData = Geometry.circle(64, 1.0, [1.0, 1.0, 1.0, 1.0]);
*/
static circle(split, rad, color){
let i, j = 0;
let pos = [], nor = [],
col = [], st = [], idx = [];
pos.push(0.0, 0.0, 0.0);
nor.push(0.0, 0.0, 1.0);
col.push(color[0], color[1], color[2], color[3]);
st.push(0.5, 0.5);
for(i = 0; i < split; i++){
let r = Math.PI * 2.0 / split * i;
let rx = Math.cos(r);
let ry = Math.sin(r);
pos.push(rx * rad, ry * rad, 0.0);
nor.push(0.0, 0.0, 1.0);
col.push(color[0], color[1], color[2], color[3]);
st.push((rx + 1.0) * 0.5, 1.0 - (ry + 1.0) * 0.5);
if(i === split - 1){
idx.push(0, j + 1, 1);
}else{
idx.push(0, j + 1, j + 2);
}
++j;
}
return {position: pos, normal: nor, color: col, texCoord: st, index: idx}
}
/**
* キューブの頂点情報を生成する
* @param {number} side - 正立方体の一辺の長さ
* @param {Array.<number>} color - RGBA を 0.0 から 1.0 の範囲で指定した配列
* @return {object}
* @property {Array.<number>} position - 頂点座標
* @property {Array.<number>} n.........完整代码请登录后点击上方下载按钮下载查看
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