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dice-instancing.html
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dice-instancing.html
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<!DOCTYPE html>
<html>
<head>
<title>Polyhedral Dice</title>
<meta name="description" content="Polyhedral Dice">
<link rel="icon" type="image/png" href="data:image/png;base64,iVBORw0KGgo=">
<script src="js/aframe-v1.3.0.js"></script>
<script src="js/aframe-environment-component.js"></script>
</head>
<body>
<script>
// material used by instances
let instanceMaterial = new THREE.ShaderMaterial({
uniforms:
{
time: { value: 0 },
map: { type: "map" },
lightColor: { type: "color", value: "#FFFFFF"},
darkColor: { type: "color", value: "#000000"},
},
vertexShader:
`
// automatically declared....
// attribute mat4 instanceMatrix;
// attribute vec3 instanceColor;
// instance attributes
attribute vec3 lightColor;
varying vec3 vLightColor;
attribute vec3 darkColor;
varying vec3 vDarkColor;
attribute float instanceIndex;
attribute vec3 instanceRandom;
uniform float time;
varying vec2 vUv;
mat4 rotationX(float angle)
{
float s = sin(angle);
float c = cos(angle);
return mat4(1.0, 0.0, 0.0, 0.0,
0.0, c, s, 0.0,
0.0, -s, c, 0.0,
0.0, 0.0, 0.0, 1.0);
}
mat4 rotationY(float angle)
{
float s = sin(angle);
float c = cos(angle);
return mat4( c, 0.0, -s, 0.0,
0.0, 1.0, 0.0, 0.0,
s, 0.0, c, 0.0,
0.0, 0.0, 0.0, 1.0);
}
mat4 rotationZ(float angle)
{
float s = sin(angle);
float c = cos(angle);
return mat4( c, s, 0.0, 0.0,
-s, c, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0);
}
void main()
{
float i = mod(instanceIndex / 1000.0 + time / 1000.0, 1.0);
float x = sin(i * 42.0 * 3.1416);
float y = 2.0 * i - 1.0;
float z = cos(i * 42.0 * 3.1416);
float d = sqrt(x*x + y*y + z*z) / 400.0;
x = x/d;
y = y/d;
z = z/d;
vec4 mvPosition = vec4(position, 0.0);
// local rotations
mvPosition = rotationX(time * instanceRandom.x) * rotationY(time * instanceRandom.y) * rotationZ(time * instanceRandom.z) * mvPosition;
// translate to point on sphere
mvPosition += vec4( x, y, z, 1.0 );
// extra matrix from instancing
mvPosition = instanceMatrix * mvPosition;
mvPosition = modelViewMatrix * mvPosition;
gl_Position = projectionMatrix * mvPosition;
vUv = uv;
vLightColor = lightColor;
vDarkColor = darkColor;
}
`,
fragmentShader: `
uniform sampler2D map;
varying vec2 vUv;
varying vec3 vLightColor;
varying vec3 vDarkColor;
void main()
{
vec4 color = texture2D(map, vUv);
if ( (color.r + color.g + color.b) / 3.0 > 0.8 )
color.rgb *= vLightColor;
else
color.rgb *= vDarkColor;
gl_FragColor = color;
}
`
}); // end of ShaderMaterial
// select random element from array
Array.prototype.random = function ()
{ return this[ Math.floor( this.length * Math.random() ) ]; };
// generate random float value in range
Math.randomFloat = function (min=0, max=100)
{ return min + (max - min) * Math.random(); };
AFRAME.registerComponent("dice-instances", {
schema: {
},
init: function ()
{
// inject some helpful functions for working with instanced meshes
THREE.InstancedMesh.prototype.createInstanceAttribute = function(attribName, vecSize, type="float")
{
let array;
if (type == "float")
array = new Float32Array(this.count * vecSize);
else if (type == "int")
array = new Int32Array(this.count * vecSize);
else
console.error("unknown attribute type: " + type);
this.geometry.setAttribute( attribName, new THREE.InstancedBufferAttribute(array, vecSize) );
};
THREE.InstancedMesh.prototype.setInstanceValueAtIndex = function(attribName, index, valueArray)
{
let offset = index * valueArray.length;
for (let i = 0; i < valueArray.length; i++)
this.geometry.getAttribute(attribName).array[offset + i] = valueArray[i];
};
// use to generate instance matrix transforms.
let dummy = new THREE.Object3D();
let colorArray = [ [1, 0.2, 0.2], [1, 0.5, 0.2], [1.0, 1.0, 0.0], [0.2, 0.8, 0.2], [0.5, 0.8, 1.0], [0.8, 0.5, 1.0] ];
// load a model -------------------------------------------------------
let loader = new THREE.GLTFLoader();
let self = this;
let callbackFunction = function(model)
{
// adding the mesh once
let mesh = model.scene.children[0];
let baseGeometry = mesh.geometry;
// let baseMaterial = mesh.material;
let baseMaterial = instanceMaterial;
baseMaterial.uniforms.map.value = mesh.material.map;
let megamesh = new THREE.InstancedMesh(baseGeometry, baseMaterial, 1000);
megamesh.createInstanceAttribute("lightColor", 3);
megamesh.createInstanceAttribute("darkColor", 3);
megamesh.createInstanceAttribute("instanceIndex", 1);
megamesh.createInstanceAttribute("instanceRandom", 3);
self.el.object3D.add(megamesh);
for (let i = 0; i < 1000; i++)
{
dummy.position.set(0, 0, 0);
dummy.rotation.set(0, 0, 0);
dummy.scale.set(0.0028, 0.0028, 0.0028)
dummy.updateMatrix();
megamesh.setMatrixAt(i, dummy.matrix);
megamesh.setInstanceValueAtIndex( "instanceIndex", i, [i] );
megamesh.setInstanceValueAtIndex( "instanceRandom", i,
[Math.randomFloat(-2,2), Math.randomFloat(-2,2), Math.randomFloat(-2,2)] );
if ( Math.random() < 0.333 )
{
megamesh.setInstanceValueAtIndex( "darkColor", i, colorArray.random() );
megamesh.setInstanceValueAtIndex( "lightColor", i, [1.0, 1.0, 1.0] );
}
else if ( Math.random() < 0.500 )
{
megamesh.setInstanceValueAtIndex( "lightColor", i, colorArray.random() );
megamesh.setInstanceValueAtIndex( "darkColor", i, [1.0, 1.0, 1.0] );
}
else
{
megamesh.setInstanceValueAtIndex( "lightColor", i, colorArray.random() );
megamesh.setInstanceValueAtIndex( "darkColor", i, [0.2, 0.2, 0.2] );
}
}
};
loader.load("models/dice/d20.glb", callbackFunction)
},
tick: function(time, deltaTime)
{
time /= 1000;
instanceMaterial.uniforms.time.value = time;
},
});
</script>
<a-scene environment="preset: starry; ground: none;" background="color: #000000;">
<a-entity camera look-controls wasd-controls="acceleration: 5" position="0 1.6 0">
<a-entity light="type: point; color: #888888; distance: 20;"></a-entity>
</a-entity>
<a-entity dice-instances position="0 1.6 -1.7"></a-entity>
</a-scene>
</body>
</html>