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01.html
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<html>
<head>
<title>Hyper sphere</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<script type="text/javascript" src="gl-matrix-min.js"></script>
<script id="shader-fs" type="x-shader/x-fragment">
precision mediump float;
varying vec4 xyzt;
void main(void) {
float r = sin(xyzt[0]*5.0)/2.0+0.5;
float g = sin(xyzt[1]*5.0)/2.0+0.5;
float b = sin(xyzt[2]*5.0)/2.0+0.5;
float t = sin(xyzt[3]*5.0)/2.0+0.5;
gl_FragColor = vec4(r, g, b, t);
}
</script>
<script id="shader-vs" type="x-shader/x-vertex">
attribute vec4 aVertexPosition;
uniform mat4 uMVMatrix;
uniform mat4 uPMatrix;
uniform mat4 uR1Matrix;
uniform mat4 uR2Matrix;
uniform mat4 uR3Matrix;
varying vec4 xyzt;
void main(void) {
xyzt = aVertexPosition;
gl_Position = uPMatrix * uMVMatrix * (vec4(0.0, 0.0, 0.0, 8.0) + uR3Matrix * uR2Matrix * uR1Matrix * aVertexPosition);
}
</script>
<script type="text/javascript">
var sin = Math.sin;
var cos = Math.cos;
var k = 3.1415926/180.0;
var gl;
function initGL(canvas) {
try {
gl = canvas.getContext("experimental-webgl");
gl.viewportWidth = canvas.width;
gl.viewportHeight = canvas.height;
} catch (e) {
}
if (!gl) {
alert("Could not initialise WebGL, sorry :-(");
}
}
function getShader(gl, id) {
var shaderScript = document.getElementById(id);
if (!shaderScript) {
return null;
}
var str = "";
var k = shaderScript.firstChild;
while (k) {
if (k.nodeType == 3) {
str += k.textContent;
}
k = k.nextSibling;
}
var shader;
if (shaderScript.type == "x-shader/x-fragment") {
shader = gl.createShader(gl.FRAGMENT_SHADER);
} else if (shaderScript.type == "x-shader/x-vertex") {
shader = gl.createShader(gl.VERTEX_SHADER);
} else {
return null;
}
gl.shaderSource(shader, str);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
alert(gl.getShaderInfoLog(shader));
return null;
}
return shader;
}
var shaderProgram;
function initShaders() {
var fragmentShader = getShader(gl, "shader-fs");
var vertexShader = getShader(gl, "shader-vs");
shaderProgram = gl.createProgram();
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
alert("Could not initialise shaders");
}
gl.useProgram(shaderProgram);
shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);
shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMatrix");
shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");
shaderProgram.r1MatrixUniform = gl.getUniformLocation(shaderProgram, "uR1Matrix");
shaderProgram.r2MatrixUniform = gl.getUniformLocation(shaderProgram, "uR2Matrix");
shaderProgram.r3MatrixUniform = gl.getUniformLocation(shaderProgram, "uR3Matrix");
}
var mvMatrix = mat4.create();
var pMatrix = mat4.create();
function setMatrixUniforms(a1,a2, a3) {
gl.uniformMatrix4fv(shaderProgram.pMatrixUniform , false, pMatrix);
gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mvMatrix);
gl.uniformMatrix4fv(shaderProgram.r1MatrixUniform, false, rotX1X2(a1));
gl.uniformMatrix4fv(shaderProgram.r2MatrixUniform, false, rotX2X3(a3));
gl.uniformMatrix4fv(shaderProgram.r3MatrixUniform, false, rotX3X4(a3));
}
function rotX1X2(a) {
return mat4.fromValues(
cos(a), sin(a), 0, 0,
-sin(a), cos(a), 0, 0,
0, 0, 1, 0,
0, 0, 0, 1,
);
}
function rotX2X3(a) {
return mat4.fromValues(
1, 0, 0, 0,
0, cos(a), sin(a), 0,
0,-sin(a), cos(a), 0,
0, 0, 0, 1
);
}
function rotX1X3(a) {
return mat4.fromValues(
cos(a), 0, sin(a), 0,
0 , 1, 0, 0,
-sin(a), 0, cos(a), 0,
0 , 0, 0, 1
);
}
function rotX3X4(a) {
return mat4.fromValues(
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, cos(a), sin(a),
0, 0,-sin(a), cos(a),
);
}
var triangleVertexPositionBuffer;
var squareVertexPositionBuffer;
function generateMeridians(r) {
var s = 15.0;
var vertices = [];
for(var a1=0; a1<180; a1+=s) {
for(var a2=0; a2<180; a2+=s) {
for(var a3=0; a3<3600; a3+=s) {
vertices.push(r*cos(k*a1));
vertices.push(r*sin(k*a1)*cos(k*a2));
vertices.push(r*sin(k*a1)*sin(k*a2)*cos(k*a3));
vertices.push(r*sin(k*a1)*sin(k*a2)*sin(k*a3));
// vertices.push(1.0)
}
}
}
return vertices;
}
function generateRandom(r, cnt) {
vertices = []
for(var i=0; i<cnt; i++) {
a1 = Math.random()*180.0;
a2 = Math.random()*180.0;
a3 = Math.random()*360.0;
vertices.push(r*cos(k*a1));
vertices.push(r*sin(k*a1)*cos(k*a2));
vertices.push(r*sin(k*a1)*sin(k*a2)*cos(k*a3));
// vertices.push(r*sin(k*a1)*sin(k*a2)*sin(k*a3));
vertices.push(1.0);
}
return vertices;
}
function generateRandom2(r, cnt) {
vertices = []
for(var i=0; i<cnt; i++) {
a1 = Math.random()-0.5;
a2 = Math.random()-0.5;
a3 = Math.random()-0.5;
a4 = Math.random()-0.5;
l = Math.sqrt(a1*a1+a2*a2+a3*a3+a4*a4);
var n = r/l;
a1 *= n
a2 *= n;
a3 *= n;
a4 *= n;
vertices.push(a1-a2/50.0);
vertices.push(a2+a1/50.0);
vertices.push(a3);
vertices.push(a4);
vertices.push(a1+a2/50.0);
vertices.push(a2-a1/50.0);
vertices.push(a3);
vertices.push(a4);
}
return vertices;
}
function initBuffers() {
triangleVertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, triangleVertexPositionBuffer);
// var vertices = generateMeridians(5.0);
var vertices =generateRandom2(5.0, 60000);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
triangleVertexPositionBuffer.itemSize = 4;
triangleVertexPositionBuffer.numItems = vertices.length/4;
}
var a1 = 0.0, a2 = 0.0, a3 = 0.0;
function drawScene() {
gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
mat4.perspective(-pMatrix, 45, gl.viewportWidth / gl.viewportHeight, 0.0, 10000.0);
// mat4.ortho(pMatrix,-10, 10, -10, 10, 0.01, 100.0);
// mat4.fromTranslation(mvMatrix, [0.0, 0.0, -10.0]);
gl.bindBuffer(gl.ARRAY_BUFFER, triangleVertexPositionBuffer);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, triangleVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
a1 += 0.001;
a2 += 0.002;
a3 += 0.01;
setMatrixUniforms(a1, a2, a3);
gl.drawArrays(gl.LINES, 0, triangleVertexPositionBuffer.numItems);
}
function animate() {
gl.clearColor(0.0, 0.0, 0.0, 0.0);
//gl.enable(gl.DEPTH_TEST);
gl.enable(gl.BLEND);
gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
drawScene();
}
function webGLStart() {
var canvas = document.getElementById("canvas");
initGL(canvas);
initShaders();
initBuffers();
setInterval(animate, 1000/60);
}
</script>
</head>
<body onload="webGLStart();" style="background:black;">
<canvas
id="canvas"
style="border: none;position:absolute; margin: auto; left:0; top:0; bottom:0; right:0;"
width="800"
height="800"></canvas>
</body>
</html>