/**
* @author Mike Piecuch / https://github.com/mikepiecuch
*
* Based on research paper "Real-Time Fluid Dynamics for Games" by Jos Stam
* http://www.dgp.toronto.edu/people/stam/reality/Research/pdf/GDC03.pdf
*
*/
THREE.Fire = function ( geometry, options ) {
THREE.Mesh.call( this, geometry );
this.type = 'Fire';
this.clock = new THREE.Clock();
options = options || {};
var textureWidth = options.textureWidth || 512;
var textureHeight = options.textureHeight || 512;
var oneOverWidth = 1.0 / textureWidth;
var oneOverHeight = 1.0 / textureHeight;
var debug = ( options.debug === undefined ) ? false : options.debug;
this.color1 = options.color1 || new THREE.Color( 0xffffff );
this.color2 = options.color2 || new THREE.Color( 0xffa000 );
this.color3 = options.color3 || new THREE.Color( 0x000000 );
this.colorBias = ( options.colorBias === undefined ) ? 0.8 : options.colorBias;
this.diffuse = ( options.diffuse === undefined ) ? 1.33 : options.diffuse;
this.viscosity = ( options.viscosity === undefined ) ? 0.25 : options.viscosity;
this.expansion = ( options.expansion === undefined ) ? - 0.25 : options.expansion;
this.swirl = ( options.swirl === undefined ) ? 50.0 : options.swirl;
this.burnRate = ( options.burnRate === undefined ) ? 0.3 : options.burnRate;
this.drag = ( options.drag === undefined ) ? 0.35 : options.drag;
this.airSpeed = ( options.airSpeed === undefined ) ? 6.0 : options.airSpeed;
this.windVector = options.windVector || new THREE.Vector2( 0.0, 0.75 );
this.speed = ( options.speed === undefined ) ? 500.0 : options.speed;
this.massConservation = ( options.massConservation === undefined ) ? false : options.massConservation;
var size = textureWidth * textureHeight;
this.sourceData = new Uint8Array( 4 * size );
this.clearSources = function () {
for ( var y = 0; y < textureHeight; y ++ ) {
for ( var x = 0; x < textureWidth; x ++ ) {
var i = y * textureWidth + x;
var stride = i * 4;
this.sourceData[ stride ] = 0;
this.sourceData[ stride + 1 ] = 0;
this.sourceData[ stride + 2 ] = 0;
this.sourceData[ stride + 3 ] = 0;
}
}
this.sourceMaterial.uniforms[ "sourceMap" ].value = this.internalSource;
this.sourceMaterial.needsUpdate = true;
return this.sourceData;
};
this.addSource = function ( u, v, radius, density = null, windX = null, windY = null ) {
var startX = Math.max( Math.floor( ( u - radius ) * textureWidth ), 0 );
var startY = Math.max( Math.floor( ( v - radius ) * textureHeight ), 0 );
var endX = Math.min( Math.floor( ( u + radius ) * textureWidth ), textureWidth );
var endY = Math.min( Math.floor( ( v + radius ) * textureHeight ), textureHeight );
for ( var y = startY; y < endY; y ++ ) {
for ( var x = startX; x < endX; x ++ ) {
var diffX = x * oneOverWidth - u;
var diffY = y * oneOverHeight - v;
if ( diffX * diffX + diffY * diffY < radius * radius ) {
var i = y * textureWidth + x;
var stride = i * 4;
if ( density != null ) {
this.sourceData[ stride ] = Math.min( Math.max( density, 0.0 ), 1.0 ) * 255;
}
if ( windX != null ) {
var wind = Math.min( Math.max( windX, - 1.0 ), 1.0 );
wind = ( wind < 0.0 ) ? Math.floor( wind * 127 ) + 255 : Math.floor( wind * 127 );
this.sourceData[ stride + 1 ] = wind;
}
if ( windY != null ) {
var wind = Math.min( Math.max( windY, - 1.0 ), 1.0 );
wind = ( wind < 0.0 ) ? Math.floor( wind * 127 ) + 255 : Math.floor( wind * 127 );
this.sourceData[ stride + 2 ] = wind;
}
}
}
}
this.internalSource.needsUpdate = true;
return this.sourceData;
};
// When setting source map, red channel is density. Green and blue channels
// encode x and y velocity respectively as signed chars:
// (0 -> 127 = 0.0 -> 1.0, 128 -> 255 = -1.0 -> 0.0 )
this.setSourceMap = function ( texture ) {
this.sourceMaterial.uniforms[ "sourceMap" ].value = texture;
};
var parameters = {
minFilter: THREE.NearestFilter,
magFilter: THREE.NearestFilter,
depthBuffer: false,
stencilBuffer: false
};
this.field0 = new THREE.WebGLRenderTarget( textureWidth, textureHeight, parameters );
this.field0.background = new THREE.Color( 0x000000 );
this.field1 = new THREE.WebGLRenderTarget( textureWidth, textureHeight, parameters );
this.field0.background = new THREE.Color( 0x000000 );
this.fieldProj = new THREE.WebGLRenderTarget( textureWidth, textureHeight, parameters );
this.field0.background = new THREE.Color( 0x000000 );
if ( ! THREE.Math.isPowerOfTwo( textureWidth ) ||
! THREE.Math.isPowerOfTwo( textureHeight ) ) {
this.field0.texture.generateMipmaps = false;
this.field1.texture.generateMipmaps = false;
this.fieldProj.texture.generateMipmaps = false;
}
this.fieldScene = new THREE.Scene();
this.fieldScene.background = new THREE.Color( 0x000000 );
this.orthoCamera = new THREE.OrthographicCamera( textureWidth / - 2, textureWidth / 2, textureHeight / 2, textureHeight / - 2, 1, 2 );
this.orthoCamera.position.z = 1;
this.fieldGeometry = new THREE.PlaneBufferGeometry( textureWidth, textureHeight );
this.internalSource = new THREE.DataTexture( this.sourceData, textureWidth, textureHeight, THREE.RGBAFormat );
// Source Shader
var shader = THREE.Fire.SourceShader;
this.sourceMaterial = new THREE.ShaderMaterial( {
uniforms: shader.uniforms,
vertexShader: shader.vertexShader,
fragmentShader: shader.fragmentShader,
transparent: false
} );
this.clearSources();
this.sourceMesh = new THREE.Mesh( this.fieldGeometry, this.sourceMaterial );
this.fieldScene.add( this.sourceMesh );
// Diffuse Shader
var shader = THREE.Fire.DiffuseShader;
this.diffuseMaterial = new THREE.ShaderMaterial( {
uniforms: shader.uniforms,
vertexShader: shader.vertexShader,
fragmentShader: shader.fragmentShader,
transparent: false
} );
this.diffuseMaterial.uniforms[ "oneOverWidth" ].value = oneOverWidth;
this.diffuseMaterial.uniforms[ "oneOverHeight" ].value = oneOverHeight;
this.diffuseMesh = new THREE.Mesh( this.fieldGeometry, this.diffuseMaterial );
this.fieldScene.add( this.diffuseMesh );
// Drift Shader
shader = THREE.Fire.DriftShader;
this.driftMaterial = new THREE.ShaderMaterial( {
uniforms: shader.uniforms,
vertexShader: shader.vertexShader,
fragmentShader: shader.fragmentShader,
transparent: false
} );
this.driftMaterial.uniforms[ "oneOverWidth" ].value = oneOverWidth;
this.driftMaterial.uniforms[ "oneOverHeight" ].value = oneOverHeight;
this.driftMesh = new THREE.Mesh( this.fieldGeometry, this.driftMaterial );
this.fieldScene.add( this.driftMesh );
// Projection Shader 1
shader = THREE.Fire.ProjectionShader1;
this.projMaterial1 = new THREE.ShaderMaterial( {
uniforms: shader.uniforms,
vertexShader: shader.vertexShader,
fragmentShader: shader.fragmentShader,
transparent: false
} );
this.projMaterial1.uniforms[ "oneOverWidth" ].value = oneOverWidth;
this.projMaterial1.uniforms[ "oneOverHeight" ].value = oneOverHeight;
this.projMesh1 = new THREE.Mesh( this.fieldGeometry, this.projMaterial1 );
this.fieldScene.add( this.projMesh1 );
// Projection Shader 2
shader = THREE.Fire.ProjectionShader2;
this.projMaterial2 = new THREE.ShaderMaterial( {
uniforms: shader.uniforms,
vertexShader: shader.vertexShader,
fragmentShader: shader.fragmentShader,
transparent: false
} );
this.projMaterial2.uniforms[ "oneOverWidth" ].value = oneOverWidth;
this.projMaterial2.uniforms[ "oneOverHeight" ].value = oneOverHeight;
this.projMesh2 = new THREE.Mesh( this.fieldGeometry, this.projMaterial2 );
this.fieldScene.add( this.projMesh2 );
// Projection Shader 3
shader = THREE.Fire.ProjectionShader3;
this.projMaterial3 = new THREE.ShaderMaterial( {
uniforms: shader.uniforms,
vertexShader: shader.vertexShader,
fragmentShader: shader.fragmentShader,
transparent: false
} );
this.projMaterial3.uniforms[ "oneOverWidth" ].value = oneOverWidth;
this.projMaterial3.uniforms[ "oneOverHeight" ].value = oneOverHeight;
this.projMesh3 = new THREE.Mesh( this.fieldGeometry, this.projMaterial3 );
this.fieldScene.add( this.projMesh3 );
// Color Shader
if ( debug ) {
shader = THREE.Fire.DebugShader;
} else {
shader = THREE.Fire.ColorShader;
}
this.material = new THREE.ShaderMaterial( {
uniforms: shader.uniforms,
vertexShader: shader.vertexShader,
fragmentShader: shader.fragmentShader,
transparent: true
} );
this.material.uniforms[ "densityMap" ].value = this.field1.texture;
this.configShaders = function ( dt ) {
this.diffuseMaterial.uniforms[ "diffuse" ].value = dt * 0.05 * this.diffuse;
this.diffuseMaterial.uniforms[ "viscosity" ].value = dt * 0.05 * this.viscosity;
this.diffuseMaterial.uniforms[ "expansion" ].value = Math.exp( this.expansion * - 1.0 );
this.diffuseMaterial.uniforms[ "swirl" ].value = Math.exp( this.swirl * - 0.1 );
this.diffuseMaterial.uniforms[ "drag" ].value = Math.exp( this.drag * - 0.1 );
this.diffuseMaterial.uniforms[ "burnRate" ].value = this.burnRate * dt * 0.01;
this.driftMaterial.uniforms[ "windVector" ].value = this.windVector;
this.driftMaterial.uniforms[ "airSpeed" ].value = dt * this.airSpeed * 0.001 * textureHeight;
this.material.uniforms[ "color1" ].value = this.color1;
this.material.uniforms[ "color2" ].value = this.color2;
this.material.uniforms[ "color3" ].value = this.color3;
this.material.uniforms[ "colorBias" ].value = this.colorBias;
};
this.clearDiffuse = function () {
this.diffuseMaterial.uniforms[ "expansion" ].value = 1.0;
this.diffuseMaterial.uniforms[ "swirl" ].value = 1.0;
this.diffuseMaterial.uniforms[ "drag" ].value = 1.0;
this.diffuseMaterial.uniforms[ "burnRate" ].value = 0.0;
};
this.swapTextures = function () {
var swap = this.field0;
this.field0 = this.field1;
this.field1 = swap;
};
this.saveRenderState = function ( renderer ) {
this.savedRenderTarget = renderer.getRenderTarget();
this.savedVrEnabled = renderer.vr.enabled;
this.savedShadowAutoUpdate = renderer.shadowMap.autoUpdate;
this.savedAntialias = renderer.antialias;
this.savedToneMapping = renderer.toneMapping;
};
this.restoreRenderState = function ( renderer ) {
renderer.vr.enabled = this.savedVrEnabled;
renderer.shadowMap.autoUpdate = this.savedShadowAutoUpdate;
renderer.setRenderTarget( this.savedRenderTarget );
renderer.antialias = this.savedAntialias;
renderer.toneMapping = this.savedToneMapping;
};
this.renderSource = function ( renderer ) {
this.sourceMesh.visible = true;
this.sourceMaterial.uniforms[ "densityMap" ].value = this.field0.texture;
renderer.setRenderTarget( this.field1 );
renderer.render( this.fieldScene, this.orthoCamera );
this.sourceMesh.visible = false;
this.swapTextures();
};
this.renderDiffuse = function ( renderer ) {
this.diffuseMesh.visible = true;
this.diffuseMaterial.uniforms[ "densityMap" ].value = this.field0.texture;
renderer.setRenderTarget( this.field1 );
renderer.render( this.fieldScene, this.orthoCamera );
this.diffuseMesh.visible = false;
this.swapTextures();
};
this.renderDrift = function ( renderer ) {
this.driftMesh.visible = true;
this.driftMaterial.uniforms[ "densityMap" ].value = this.field0.texture;
renderer.setRenderTarget( this.field1 );
renderer.render( this.fieldScene, this.orthoCamera );
this.driftMesh.visible = false;
this.swapTextures();
};
this.renderProject = function ( renderer ) {
// Projection pass 1
this.projMesh1.visible = true;
this.projMaterial1.uniforms[ "densityMap" ].value = this.field0.texture;
renderer.setRenderTarget( this.fieldProj );
renderer.render( this.fieldScene, this.orthoCamera );
this.projMesh1.visible = false;
this.projMaterial2.uniforms[ "densityMap" ].value = this.fieldProj.texture;
// Projection pass 2
this.projMesh2.visible = true;
for ( var i = 0; i < 20; i ++ ) {
renderer.setRenderTarget( this.field1 );
renderer.render( this.fieldScene, this.orthoCamera );
var temp = this.field1;
this.field1 = this.fieldProj;
this.fieldProj = temp;
this.projMaterial2.uniforms[ "densityMap" ].value = this.fieldProj.texture;
}
this.projMesh2.visible = false;
this.projMaterial3.uniforms[ "densityMap" ].value = this.field0.texture;
this.projMaterial3.uniforms[ "projMap" ].value = this.fieldProj.texture;
// Projection pass 3
this.projMesh3.visible = true;
renderer.setRenderTarget( this.field1 );
renderer.render( this.fieldScene, this.orthoCamera );
this.projMesh3.visible = false;
this.swapTextures();
};
this.onBeforeRender = function ( renderer ) {
var delta = this.clock.getDelta();
if ( delta > 0.1 ) {
delta = 0.1;
}
var dt = delta * ( this.speed * 0.1 );
this.configShaders( dt );
this.saveRenderState( renderer );
renderer.vr.enabled = false; // Avoid camera modification and recursion
renderer.shadowMap.autoUpdate = false; // Avoid re-computing shadows
renderer.antialias = false;
renderer.toneMapping = THREE.NoToneMapping;
this.sourceMesh.visible = false;
this.diffuseMesh.visible = false;
this.driftMesh.visible = false;
this.projMesh1.visible = false;
this.projMesh2.visible = false;
this.projMesh3.visible = false;
this.renderSource( renderer );
this.clearDiffuse();
for ( var i = 0; i < 21; i ++ ) {
this.renderDiffuse( renderer );
}
this.configShaders( dt );
this.renderDiffuse( renderer );
this.renderDrift( renderer );
if ( this.massConservation ) {
this.renderProject( renderer );
this.renderProject( renderer );
}
// Final result out for coloring
this.material.map = this.field1.texture;
this.material.transparent = true;
this.material.minFilter = THREE.LinearFilter,
this.material.magFilter = THREE.LinearFilter,
this.restoreRenderState( renderer );
};
};
THREE.Fire.prototype = Object.create( THREE.Mesh.prototype );
THREE.Fire.prototype.constructor = THREE.Fire;
THREE.Fire.SourceShader = {
uniforms: {
'sourceMap': {
value: null
},
'densityMap': {
value: null
}
},
vertexShader: [
'varying vec2 vUv;',
'void main() {',
' vUv = uv;',
' vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );',
' gl_Position = projectionMatrix * mvPosition;',
'}'
].join( "\n" ),
fragmentShader: [
'uniform sampler2D sourceMap;',
'uniform sampler2D densityMap;',
'varying vec2 vUv;',
'void main() {',
' vec4 source = texture2D( sourceMap, vUv );',
' vec4 current = texture2D( densityMap, vUv );',
' vec2 v0 = (current.gb - step(0.5, current.gb)) * 2.0;',
' vec2 v1 = (source.gb - step(0.5, source.gb)) * 2.0;',
' vec2 newVel = v0 + v1;',
' newVel = clamp(newVel, -0.99, 0.99);',
' newVel = newVel * 0.5 + step(0.0, -newVel);',
' float newDensity = source.r + current.a;',
' float newTemp = source.r + current.r;',
' newDensity = clamp(newDensity, 0.0, 1.0);',
' newTemp = clamp(newTemp, 0.0, 1.0);',
' gl_FragColor = vec4(newTemp, newVel.xy, newDensity);',
'}'
].join( "\n" )
};
THREE.Fire.DiffuseShader = {
uniforms: {
'oneOverWidth': {
value: null
},
'oneOverHeight': {
value: null
},
'diffuse': {
value: null
},
'viscosity': {
value: null
},
'expansion': {
value: null
},
'swirl': {
value: null
},
'drag': {
value: null
},
'burnRate': {
value: null
},
'densityMap': {
value: null
}
},
vertexShader: [
'varying vec2 vUv;',
'void main() {',
' vUv = uv;',
' vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );',
' gl_Position = projectionMatrix * mvPosition;',
'}'
].join( "\n" ),
fragmentShader: [
'uniform float oneOverWidth;',
'uniform float oneOverHeight;',
'uniform float diffuse;',
'uniform float viscosity;',
'uniform float expansion;',
'uniform float swirl;',
'uniform float burnRate;',
'uniform float drag;',
'uniform sampler2D densityMap;',
'varying vec2 vUv;',
'void main() {',
' vec4 dC = texture2D( densityMap, vUv );',
' vec4 dL = texture2D( densityMap, vec2(vUv.x - oneOverWidth, vUv.y) );',
' vec4 dR = texture2D( densityMap, vec2(vUv.x + oneOverWidth, vUv.y) );',
' vec4 dU = texture2D( densityMap, vec2(vUv.x, vUv.y - oneOverHeight) );',
' vec4 dD = texture2D( densityMap, vec2(vUv.x, vUv.y + oneOverHeight) );',
' vec4 dUL = texture2D( densityMap, vec2(vUv.x - oneOverWidth, vUv.y - oneOverHeight) );',
' vec4 dUR = texture2D( densityMap, vec2(vUv.x + oneOverWidth, vUv.y - oneOverHeight) );',
' vec4 dDL = texture2D( densityMap, vec2(vUv.x - oneOverWidth, vUv.y + oneOverHeight) );',
' vec4 dDR = texture2D( densityMap, vec2(vUv.x + oneOverWidth, vUv.y + oneOverHeight) );',
' dC.yz = (dC.yz - step(0.5, dC.yz)) * 2.0;',
' dL.yz = (dL.yz - step(0.5, dL.yz)) * 2.0;',
' dR.yz = (dR.yz - step(0.5, dR.yz)) * 2.0;',
' dU.yz = (dU.yz - step(0.5, dU.yz)) * 2.0;',
' dD.yz = (dD.yz - step(0.5, dD.yz)) * 2.0;',
' dUL.yz = (dUL.yz - step(0.5, dUL.yz)) * 2.0;',
' dUR.yz = (dUR.yz - step(0.5, dUR.yz)) * 2.0;',
' dDL.yz = (dDL.yz - step(0.5, dDL.yz)) * 2.0;',
' dDR.yz = (dDR.yz - step(0.5, dDR.yz)) * 2.0;',
' vec4 result = (dC + vec4(diffuse, viscosity, viscosity, diffuse) * ( dL + dR + dU + dD + dUL + dUR + dDL + dDR )) / (1.0 + 8.0 * vec4(diffuse, viscosity, viscosity, diffuse)) - vec4(0.0, 0.0, 0.0, 0.001);',
' float temperature = result.r;',
' temperature = clamp(temperature - burnRate, 0.0, 1.0);',
' vec2 velocity = result.yz;',
' vec2 expansionVec = vec2(dL.w - dR.w, dU.w - dD.w);',
' vec2 swirlVec = vec2((dL.z - dR.z) * 0.5, (dU.y - dD.y) * 0.5);',
' velocity = velocity + (1.0 - expansion) * expansionVec + (1.0 - swirl) * swirlVec;',
' velocity = velocity - (1.0 - drag) * velocity;',
' gl_FragColor = vec4(temperature, velocity * 0.5 + step(0.0, -velocity), result.w);',
' gl_FragColor = gl_FragColor * step(oneOverWidth, vUv.x);',
' gl_FragColor = gl_FragColor * step(oneOverHeight, vUv.y);',
' gl_FragColor = gl_FragColor * step(vUv.x, 1.0 - oneOverWidth);',
' gl_FragColor = gl_FragColor * step(vUv.y, 1.0 - oneOverHeight);',
'}'
].join( "\n" )
};
THREE.Fire.DriftShader = {
uniforms: {
'oneOverWidth': {
value: null
},
'oneOverHeight': {
value: null
},
'windVector': {
value: new THREE.Vector2( 0.0, 0.0 )
},
'airSpeed': {
value: null
},
'densityMap': {
value: null
}
},
vertexShader: [
'varying vec2 vUv;',
'void main() {',
' vUv = uv;',
' vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );',
' gl_Position = projectionMatrix * mvPosition;',
'}'
].join( "\n" ),
fragmentShader: [
'uniform float oneOverWidth;',
'uniform float oneOverHeight;',
'uniform vec2 windVector;',
'uniform float airSpeed;',
'uniform sampler2D densityMap;',
'varying vec2 vUv;',
'void main() {',
' vec2 velocity = texture2D( densityMap, vUv ).gb;',
' velocity = (velocity - step(0.5, velocity)) * 2.0;',
' velocity = velocity + windVector;',
' vec2 sourcePos = vUv - airSpeed * vec2(oneOverWidth, oneOverHeight) * velocity;',
' vec2 units = sourcePos / vec2(oneOverWidth, oneOverHeight);',
' vec2 intPos = floor(units);',
' vec2 frac = units - intPos;',
' intPos = intPos * vec2(oneOverWidth, oneOverHeight);',
' vec4 dX0Y0 = texture2D( densityMap, intPos + vec2(0.0, -oneOverHeight) );',
' vec4 dX1Y0 = texture2D( densityMap, intPos + vec2(oneOverWidth, 0.0) );',
' vec4 dX0Y1 = texture2D( densityMap, intPos + vec2(0.0, oneOverHeight) );',
' vec4 dX1Y1 = texture2D( densityMap, intPos + vec2(oneOverWidth, oneOverHeight) );',
' dX0Y0.gb = (dX0Y0.gb - step(0.5, dX0Y0.gb)) * 2.0;',
' dX1Y0.gb = (dX1Y0.gb - step(0.5, dX1Y0.gb)) * 2.0;',
' dX0Y1.gb = (dX0Y1.gb - step(0.5, dX0Y1.gb)) * 2.0;',
' dX1Y1.gb = (dX1Y1.gb - step(0.5, dX1Y1.gb)) * 2.0;',
' vec4 source = mix(mix(dX0Y0, dX1Y0, frac.x), mix(dX0Y1, dX1Y1, frac.x), frac.y);',
' source.gb = source.gb * 0.5 + step(0.0, -source.gb);',
' gl_FragColor = source;',
'}'
].join( "\n" )
};
THREE.Fire.ProjectionShader1 = {
uniforms: {
'oneOverWidth': {
value: null
},
'oneOverHeight': {
value: null
},
'densityMap': {
value: null
}
},
vertexShader: [
'varying vec2 vUv;',
'void main() {',
' vUv = uv;',
' vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );',
' gl_Position = projectionMatrix * mvPosition;',
'}'
].join( "\n" ),
fragmentShader: [
'uniform float oneOverWidth;',
'uniform float oneOverHeight;',
'uniform sampler2D densityMap;',
'varying vec2 vUv;',
'void main() {',
' float dL = texture2D( densityMap, vec2(vUv.x - oneOverWidth, vUv.y) ).g;',
' float dR = texture2D( densityMap, vec2(vUv.x + oneOverWidth, vUv.y) ).g;',
' float dU = texture2D( densityMap, vec2(vUv.x, vUv.y - oneOverHeight) ).b;',
' float dD = texture2D( densityMap, vec2(vUv.x, vUv.y + oneOverHeight) ).b;',
' dL = (dL - step(0.5, dL)) * 2.0;',
' dR = (dR - step(0.5, dR)) * 2.0;',
' dU = (dU - step(0.5, dU)) * 2.0;',
' dD = (dD - step(0.5, dD)) * 2.0;',
' float h = (oneOverWidth + oneOverHeight) * 0.5;',
' float div = -0.5 * h * (dR - dL + dD - dU);',
' gl_FragColor = vec4( 0.0, 0.0, div * 0.5 + step(0.0, -div), 0.0);',
'}'
].join( "\n" )
};
THREE.Fire.ProjectionShader2 = {
uniforms: {
'oneOverWidth': {
value: null
},
'oneOverHeight': {
value: null
},
'densityMap': {
value: null
}
},
vertexShader: [
'varying vec2 vUv;',
'void main() {',
' vUv = uv;',
' vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );',
' gl_Position = projectionMatrix * mvPosition;',
'}'
].join( "\n" ),
fragmentShader: [
'uniform float oneOverWidth;',
'uniform float oneOverHeight;',
'uniform sampler2D densityMap;',
'varying vec2 vUv;',
'void main() {',
' float div = texture2D( densityMap, vUv ).b;',
' float pL = texture2D( densityMap, vec2(vUv.x - oneOverWidth, vUv.y) ).g;',
' float pR = texture2D( densityMap, vec2(vUv.x + oneOverWidth, vUv.y) ).g;',
' float pU = texture2D( densityMap, vec2(vUv.x, vUv.y - oneOverHeight) ).g;',
' float pD = texture2D( densityMap, vec2(vUv.x, vUv.y + oneOverHeight) ).g;',
' float divNorm = (div - step(0.5, div)) * 2.0;',
' pL = (pL - step(0.5, pL)) * 2.0;',
' pR = (pR - step(0.5, pR)) * 2.0;',
' pU = (pU - step(0.5, pU)) * 2.0;',
' pD = (pD - step(0.5, pD)) * 2.0;',
' float p = (divNorm + pR + pL + pD + pU) * 0.25;',
' gl_FragColor = vec4( 0.0, p * 0.5 + step(0.0, -p), div, 0.0);',
'}'
].join( "\n" )
};
THREE.Fire.ProjectionShader3 = {
uniforms: {
'oneOverWidth': {
value: null
},
'oneOverHeight': {
value: null
},
'densityMap': {
value: null
},
'projMap': {
value: null
}
},
vertexShader: [
'varying vec2 vUv;',
'void main() {',
' vUv = uv;',
' vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );',
' gl_Position = projectionMatrix * mvPosition;',
'}'
].join( "\n" ),
fragmentShader: [
'uniform float oneOverWidth;',
'uniform float oneOverHeight;',
'uniform sampler2D densityMap;',
'uniform sampler2D projMap;',
'varying vec2 vUv;',
'void main() {',
' vec4 orig = texture2D(densityMap, vUv);',
' float pL = texture2D( projMap, vec2(vUv.x - oneOverWidth, vUv.y) ).g;',
' float pR = texture2D( projMap, vec2(vUv.x + oneOverWidth, vUv.y) ).g;',
' float pU = texture2D( projMap, vec2(vUv.x, vUv.y - oneOverHeight) ).g;',
' float pD = texture2D( projMap, vec2(vUv.x, vUv.y + oneOverHeight) ).g;',
' float uNorm = (orig.g - step(0.5, orig.g)) * 2.0;',
' float vNorm = (orig.b - step(0.5, orig.b)) * 2.0;',
' pL = (pL - step(0.5, pL)) * 2.0;',
' pR = (pR - step(0.5, pR)) * 2.0;',
' pU = (pU - step(0.5, pU)) * 2.0;',
' pD = (pD - step(0.5, pD)) * 2.0;',
' float h = (oneOverWidth + oneOverHeight) * 0.5;',
' float u = uNorm - (0.5 * (pR - pL) / h);',
' float v = vNorm - (0.5 * (pD - pU) / h);',
' gl_FragColor = vec4( orig.r, u * 0.5 + step(0.0, -u), v * 0.5 + step(0.0, -v), orig.a);',
'}'
].join( "\n" )
};
THREE.Fire.ColorShader = {
uniforms: {
'color1': {
value: null
},
'color2': {
value: null
},
'color3': {
value: null
},
'colorBias': {
value: null
},
'densityMap': {
value: null
}
},
vertexShader: [
'varying vec2 vUv;',
'void main() {',
' vUv = uv;',
' vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );',
' gl_Position = projectionMatrix * mvPosition;',
'}'
].join( "\n" ),
fragmentShader: [
'uniform vec3 color1;',
'uniform vec3 color2;',
'uniform vec3 color3;',
'uniform float colorBias;',
'uniform sampler2D densityMap;',
'varying vec2 vUv;',
'void main() {',
' float density = texture2D( densityMap, vUv ).a;',
' float temperature = texture2D( densityMap, vUv ).r;',
' float bias = clamp(colorBias, 0.0001, 0.9999);',
' vec3 blend1 = mix(color3, color2, temperature / bias) * (1.0 - step(bias, temperature));',
' vec3 blend2 = mix(color2, color1, (temperature - bias) / (1.0 - bias) ) * step(bias, temperature);',
' gl_FragColor = vec4(blend1 + blend2, density);',
'}'
].join( "\n" )
};
THREE.Fire.DebugShader = {
uniforms: {
'color1': {
value: null
},
'color2': {
value: null
},
'color3': {
value: null
},
'colorBias': {
value: null
},
'densityMap': {
value: null
}
},
vertexShader: [
'varying vec2 vUv;',
'void main() {',
' vUv = uv;',
' vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );',
' gl_Position = projectionMatrix * mvPosition;',
'}'
].join( "\n" ),
fragmentShader: [
'uniform sampler2D densityMap;',
'varying vec2 vUv;',
'void main() {',
' float density;',
' density = texture2D( densityMap, vUv ).a;',
' vec2 vel = texture2D( densityMap, vUv ).gb;',
' vel = (vel - step(0.5, vel)) * 2.0;',
' float r = density;',
' float g = max(abs(vel.x), density * 0.5);',
' float b = max(abs(vel.y), density * 0.5);',
' float a = max(density * 0.5, max(abs(vel.x), abs(vel.y)));',
' gl_FragColor = vec4(r, g, b, a);',
'}'
].join( "\n" )
};
