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Introduces angularVelocity/spread for spinning particles #25

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Introduces angularVelocity/spread for spinning particles #25

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14 changes: 13 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -172,6 +172,18 @@ var particleEmitter = new ShaderParticleEmitter({
// [OPTIONAL] Acceleration variance.
accelerationSpread: new THREE.Vector3(0, 0, 0),

// [OPTIONAL] The intial angle of each particle
angle: 0,

// [OPTIONAL] How fast each particle is spinning
angularVelocity: 0,

// [OPTIONAL] Particle spin velocity variance
angularVelocitySpread: 0,

// [OPTIONAL] Align the particles in the direciton they are moving
angleAlignVelocity: true


// [OPTIONAL] Velocity base vector.
velocity: new THREE.Vector3(0, 0, 0),
Expand Down Expand Up @@ -269,4 +281,4 @@ See the [issues page](https://github.com/squarefeet/ShaderParticleEngine/issues)

Thanks
======
Huge thanks are extended to [Stemkoski](http://stemkoski.github.io/Three.js/) for his initial particle engine, and to [Mr Doob, AlteredQualia, et. al](https://github.com/mrdoob/three.js/graphs/contributors) for their awesome work on [THREE.js](http://threejs.org/).
Huge thanks are extended to [Stemkoski](http://stemkoski.github.io/Three.js/) for his initial particle engine, and to [Mr Doob, AlteredQualia, et. al](https://github.com/mrdoob/three.js/graphs/contributors) for their awesome work on [THREE.js](http://threejs.org/).
9 changes: 8 additions & 1 deletion build/ShaderParticles.js
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Original file line number Diff line number Diff line change
Expand Up @@ -342,6 +342,7 @@ function ShaderParticleGroup( options ) {
sizeEnd: { type: 'f', value: [] },

angle: { type: 'f', value: [] },
angularVelocity: { type: 'f', value: [] },
angleAlignVelocity: { type: 'f', value: [] },

colorStart: { type: 'c', value: [] },
Expand Down Expand Up @@ -444,6 +445,7 @@ ShaderParticleGroup.prototype = {
sizeStart = a.sizeStart.value,
sizeEnd = a.sizeEnd.value,
angle = a.angle.value,
angularVelocity = a.angularVelocity.value,
angleAlignVelocity = a.angleAlignVelocity.value,
colorStart = a.colorStart.value,
colorMiddle = a.colorMiddle.value,
Expand Down Expand Up @@ -477,6 +479,7 @@ ShaderParticleGroup.prototype = {
sizeEnd[i] = emitter.sizeEnd;

angle[i] = that._randomFloat( emitter.angle, emitter.angleSpread );
angularVelocity[i] = that._randomFloat( emitter.angularVelocity, emitter.angularVelocitySpread );
angleAlignVelocity[i] = emitter.angleAlignVelocity ? 1.0 : 0.0;

age[i] = 0.0;
Expand Down Expand Up @@ -723,6 +726,7 @@ ShaderParticleGroup.shaders = {
'attribute float sizeStart;',
'attribute float sizeEnd;',
'attribute float angle;',
'attribute float angularVelocity;',
'attribute float angleAlignVelocity;',

// values to be passed to the fragment shader
Expand Down Expand Up @@ -779,7 +783,7 @@ ShaderParticleGroup.shaders = {
'vAngle = -atan(pos.y, pos.x);',
'}',
'else {',
'vAngle = 0.0;',
'vAngle = angle + ( angularVelocity * age );',
'}',

// Determine point size .
Expand Down Expand Up @@ -880,6 +884,9 @@ function ShaderParticleEmitter( options ) {
that.angleSpread = parseFloat( typeof options.angleSpread === 'number' ? options.angleSpread : 0 );
that.angleAlignVelocity = options.angleAlignVelocity || false;

that.angularVelocity = parseFloat( typeof options.angularVelocity === 'number' ? options.angularVelocity : 0 );
that.angularVelocitySpread = parseFloat( typeof options.angularVelocitySpread === 'number' ? options.angularVelocitySpread : 0 );

that.colorStart = options.colorStart instanceof THREE.Color ? options.colorStart : new THREE.Color( 'white' );
that.colorStartSpread = options.colorStartSpread instanceof THREE.Vector3 ? options.colorStartSpread : new THREE.Vector3(0,0,0);
that.colorEnd = options.colorEnd instanceof THREE.Color ? options.colorEnd : that.colorStart.clone();
Expand Down
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