vanta.birds.min.js

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a=0,h=e.length;a<h;a++)Math.random()>.6||(i=(t=e[a]).position.distanceTo(this.position))>0&&i<=r&&(n.add(t.velocity),o++);if(o>0){n.divideScalar(o);var c=n.length();c>.1&&n.divideScalar(c/.1)}return n},this.cohesion=function(e){var t,i,n=new s.Vector3,o=new s.Vector3,r=0;const a=100*l.cohesion/20;for(var h=0,c=e.length;h<c;h++)Math.random()>.6||(i=(t=e[h]).position.distanceTo(this.position))>0&&i<=a&&(n.add(t.position),r++);r>0&&n.divideScalar(r),o.subVectors(n,this.position);var u=o.length();return u>.1&&o.divideScalar(u/.1),o},this.separation=function(e){var t,i,n=new s.Vector3,o=new s.Vector3;const r=100*l.separation/20;for(var a=0,h=e.length;a<h;a++)Math.random()>.6||(i=(t=e[a]).position.distanceTo(this.position))>0&&i<=r&&(o.subVectors(this.position,t.position),o.normalize(),o.divideScalar(i),n.add(o));return n}};const f="uniform float time;\nuniform float delta;\n\nvoid main() {\n\n  vec2 uv = gl_FragCoord.xy / resolution.xy;\n  vec4 tmpPos = texture2D( texturePosition, uv );\n  vec3 position = tmpPos.xyz;\n  vec3 velocity = texture2D( textureVelocity, uv ).xyz;\n\n  float phase = tmpPos.w;\n\n  phase = mod( ( phase + delta +\n    length( velocity.xz ) * delta * 3. +\n    max( velocity.y, 0.0 ) * delta * 6. ), 62.83 );\n\n  gl_FragColor = vec4( position + velocity * delta * 15. , phase );\n\n}",m="uniform float time;\nuniform float testing;\nuniform float delta; // about 0.016\nuniform float separationDistance; // 20\nuniform float alignmentDistance; // 40\nuniform float cohesionDistance;\nuniform float speedLimit;\nuniform float freedomFactor;\nuniform vec3 predator;\n\nconst float width = resolution.x;\nconst float height = resolution.y;\n\nconst float PI = 3.141592653589793;\nconst float PI_2 = PI * 2.0;\n// const float VISION = PI * 0.55;\n\nfloat zoneRadius = 40.0;\nfloat zoneRadiusSquared = 1600.0;\n\nfloat separationThresh = 0.45;\nfloat alignmentThresh = 0.65;\n\nconst float UPPER_BOUNDS = BOUNDS;\nconst float LOWER_BOUNDS = -UPPER_BOUNDS;\n\nfloat rand(vec2 co){\n  return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);\n}\n\nvoid main() {\n\n  zoneRadius = separationDistance + alignmentDistance + cohesionDistance;\n  separationThresh = separationDistance / zoneRadius;\n  alignmentThresh = ( separationDistance + alignmentDistance ) / zoneRadius;\n  zoneRadiusSquared = zoneRadius * zoneRadius;\n\n\n  vec2 uv = gl_FragCoord.xy / resolution.xy;\n  vec3 birdPosition, birdVelocity;\n\n  vec3 selfPosition = texture2D( texturePosition, uv ).xyz;\n  vec3 selfVelocity = texture2D( textureVelocity, uv ).xyz;\n\n  float dist;\n  vec3 dir; // direction\n  float distSquared;\n\n  float separationSquared = separationDistance * separationDistance;\n  float cohesionSquared = cohesionDistance * cohesionDistance;\n\n  float f;\n  float percent;\n\n  vec3 velocity = selfVelocity;\n\n  float limit = speedLimit;\n\n  dir = predator * UPPER_BOUNDS - selfPosition;\n  dir.z = 0.;\n  // dir.z *= 0.6;\n  dist = length( dir );\n  distSquared = dist * dist;\n\n  float preyRadius = 150.0;\n  float preyRadiusSq = preyRadius * preyRadius;\n\n  // move birds away from predator\n  if (dist < preyRadius) {\n\n    f = ( distSquared / preyRadiusSq - 1.0 ) * delta * 100.;\n    velocity += normalize( dir ) * f;\n    limit += 5.0;\n  }\n\n  // if (testing == 0.0) {}\n  // if ( rand( uv + time ) < freedomFactor ) {}\n\n  // Attract flocks to the center\n  vec3 central = vec3( 0., 0., 0. );\n  dir = selfPosition - central;\n  dist = length( dir );\n\n  dir.y *= 2.5;\n  velocity -= normalize( dir ) * delta * 5.;\n\n  for (float y=0.0;y<height;y++) {\n    for (float x=0.0;x<width;x++) {\n\n      vec2 ref = vec2( x + 0.5, y + 0.5 ) / resolution.xy;\n      birdPosition = texture2D( texturePosition, ref ).xyz;\n\n      dir = birdPosition - selfPosition;\n      dist = length(dir);\n\n      if (dist < 0.0001) continue;\n\n      distSquared = dist * dist;\n\n      if (distSquared > zoneRadiusSquared ) continue;\n\n      percent = distSquared / zoneRadiusSquared;\n\n      if ( percent < separationThresh ) { // low\n\n        // Separation - Move apart for comfort\n        f = (separationThresh / percent - 1.0) * delta;\n        velocity -= normalize(dir) * f;\n\n      } else if ( percent < alignmentThresh ) { // high\n\n        // Alignment - fly the same direction\n        float threshDelta = alignmentThresh - separationThresh;\n        float adjustedPercent = ( percent - separationThresh ) / threshDelta;\n\n        birdVelocity = texture2D( textureVelocity, ref ).xyz;\n\n        f = ( 0.5 - cos( adjustedPercent * PI_2 ) * 0.5 + 0.5 ) * delta;\n        velocity += normalize(birdVelocity) * f;\n\n      } else {\n\n        // Attraction / Cohesion - move closer\n        float threshDelta = 1.0 - alignmentThresh;\n        float adjustedPercent = ( percent - alignmentThresh ) / threshDelta;\n\n        f = ( 0.5 - ( cos( adjustedPercent * PI_2 ) * -0.5 + 0.5 ) ) * delta;\n\n        velocity += normalize(dir) * f;\n\n      }\n    }\n  }\n\n  // this make tends to fly around than down or up\n  // if (velocity.y > 0.) velocity.y *= (1. - 0.2 * delta);\n\n  // Speed Limits\n  if ( length( velocity ) > limit ) {\n    velocity = normalize( velocity ) * limit;\n  }\n\n  gl_FragColor = vec4( velocity, 1.0 );\n\n}",v="attribute vec2 reference;\nattribute float birdVertex;\n\nattribute vec3 birdColor;\n\nuniform sampler2D texturePosition;\nuniform sampler2D textureVelocity;\n\nvarying vec4 vColor;\nvarying float z;\n\nuniform float time;\nuniform float birdSize;\n\nvoid main() {\n\n  vec4 tmpPos = texture2D( texturePosition, reference );\n  vec3 pos = tmpPos.xyz;\n  vec3 velocity = normalize(texture2D( textureVelocity, reference ).xyz);\n\n  vec3 newPosition = position;\n\n  if ( birdVertex == 4.0 || birdVertex == 7.0 ) {\n    // flap wings\n    newPosition.y = sin( tmpPos.w ) * 5. * birdSize;\n  }\n\n  newPosition = mat3( modelMatrix ) * newPosition;\n\n  velocity.z *= -1.;\n  float xz = length( velocity.xz );\n  float xyz = 1.;\n  float x = sqrt( 1. - velocity.y * velocity.y );\n\n  float cosry = velocity.x / xz;\n  float sinry = velocity.z / xz;\n\n  float cosrz = x / xyz;\n  float sinrz = velocity.y / xyz;\n\n  mat3 maty =  mat3(\n    cosry, 0, -sinry,\n    0    , 1, 0     ,\n    sinry, 0, cosry\n  );\n\n  mat3 matz =  mat3(\n    cosrz , sinrz, 0,\n    -sinrz, cosrz, 0,\n    0     , 0    , 1\n  );\n  newPosition =  maty * matz * newPosition;\n  newPosition += pos;\n  z = newPosition.z;\n\n  vColor = vec4( birdColor, 1.0 );\n  gl_Position = projectionMatrix *  viewMatrix  * vec4( newPosition, 1.0 );\n}",y="varying vec4 vColor;\nvarying float z;\nuniform vec3 color;\nvoid main() {\n  // Fake colors for now\n  float rr = 0.2 + ( 1000. - z ) / 1000. * vColor.x;\n  float gg = 0.2 + ( 1000. - z ) / 1000. * vColor.y;\n  float bb = 0.2 + ( 1000. - z ) / 1000. * vColor.z;\n  gl_FragColor = vec4( rr, gg, bb, 1. );\n}",g=function(e){const t=e.image.data;let i=0;const n=t.length;return(()=>{const e=[];for(;i<n;){const n=Math.random()*c-u,o=Math.random()*c-u,r=Math.random()*c-u;t[i+0]=n,t[i+1]=o,t[i+2]=r,t[i+3]=1,e.push(i+=4)}return e})()},w=function(e){const t=e.image.data;let i=0;const n=t.length;return(()=>{const e=[];for(;i<n;){const n=Math.random()-.5,o=Math.random()-.5,r=Math.random()-.5;t[i+0]=10*n,t[i+1]=10*o,t[i+2]=10*r,t[i+3]=1,e.push(i+=4)}return e})()};s.BirdGeometry=function(e){e.quantity&&(l=Math.pow(2,e.quantity),h=l*l);const t=3*h,i=3*t;s.BufferGeometry.call(this);const n=new s.BufferAttribute(new Float32Array(3*i),3),o=new s.BufferAttribute(new Float32Array(3*i),3),r=new s.BufferAttribute(new Float32Array(2*i),2),a=new s.BufferAttribute(new Float32Array(i),1);this.addAttribute("position",n),this.addAttribute("birdColor",o),this.addAttribute("reference",r),this.addAttribute("birdVertex",a);let c=0;const u=function(){for(let e=0;e<arguments.length;e++)n.array[c++]=arguments[e]},d=e.wingSpan||20,p=e.birdSize||1;for(let e=0;e<h;e++)u(0,-0,-20*p,0,4*p,-20*p,0,0,30*p),u(0,0,-15*p,-d*p,0,0,0,0,15*p),u(0,0,15*p,d*p,0,0,0,0,-15*p);const f={};for(c=0;c<3*t;c++){const t=~~(c/3),i=t%l/l,n=~~(t/l)/l,s=~~(c/9)/h,u=s.toString(),d=-1!=e.colorMode.indexOf("Gradient");let p;p=!d&&f[u]?f[u]:e.effect.getNewCol(s),d||f[u]||(f[u]=p),o.array[3*c+0]=p.r,o.array[3*c+1]=p.g,o.array[3*c+2]=p.b,r.array[2*c]=i,r.array[2*c+1]=n,a.array[c]=c%9}return this.scale(.2,.2,.2)},s.BirdGeometry.prototype=Object.create(s.BufferGeometry.prototype);class b extends n.b{static initClass(){this.prototype.defaultOptions={backgroundColor:465199,color1:16711680,color2:53759,colorMode:"varianceGradient",birdSize:1,wingSpan:30,speedLimit:5,separation:20,alignment:20,cohesion:20,quantity:5}}constructor(e){s=e.THREE||s,super(e)}initComputeRenderer(){this.gpuCompute=new r(l,l,this.renderer);const e=this.gpuCompute.createTexture(),t=this.gpuCompute.createTexture();g(e),w(t),this.velocityVariable=this.gpuCompute.addVariable("textureVelocity",m,t),this.positionVariable=this.gpuCompute.addVariable("texturePosition",f,e),this.gpuCompute.setVariableDependencies(this.velocityVariable,[this.positionVariable,this.velocityVariable]),this.gpuCompute.setVariableDependencies(this.positionVariable,[this.positionVariable,this.velocityVariable]),this.positionUniforms=this.positionVariable.material.uniforms,this.velocityUniforms=this.velocityVariable.material.uniforms,this.positionUniforms.time={value:0},this.positionUniforms.delta={value:0},this.velocityUniforms.time={value:1},this.velocityUniforms.delta={value:0},this.velocityUniforms.testing={value:1},this.velocityUniforms.separationDistance={value:1},this.velocityUniforms.alignmentDistance={value:1},this.velocityUniforms.cohesionDistance={value:1},this.velocityUniforms.speedLimit={value:1},this.velocityUniforms.freedomFactor={value:1},this.velocityUniforms.predator={value:new s.Vector3},this.velocityVariable.material.defines.BOUNDS=c.toFixed(2),this.velocityVariable.wrapS=s.RepeatWrapping,this.velocityVariable.wrapT=s.RepeatWrapping,this.positionVariable.wrapS=s.RepeatWrapping,this.positionVariable.wrapT=s.RepeatWrapping;const i=this.gpuCompute.init();null!==i&&console.error(i)}initGpgpuBirds(){const e=Object.assign({},this.options,{effect:this}),t=new s.BirdGeometry(e);this.birdUniforms={color:{value:new s.Color(16720384)},texturePosition:{value:null},textureVelocity:{value:null},time:{value:1},delta:{value:0},birdSize:{value:this.options.birdSize}};const i=new s.ShaderMaterial({uniforms:this.birdUniforms,vertexShader:v,fragmentShader:y,side:s.DoubleSide}),n=new s.Mesh(t,i);return n.rotation.y=Math.PI/2,n.matrixAutoUpdate=!1,n.updateMatrix(),this.scene.add(n)}getNewCol(e){const t=this.options,i=null!=t.color1?t.color1:4456448,n=null!=t.color2?t.color2:6684672,o=new s.Color(i),r=new s.Color(n);let a,l;if(l=-1!=t.colorMode.indexOf("Gradient")?Math.random():e,0==t.colorMode.indexOf("variance")){const e=(o.r+Math.random()*r.r).clamp(0,1),t=(o.g+Math.random()*r.g).clamp(0,1),i=(o.b+Math.random()*r.b).clamp(0,1);a=new s.Color(e,t,i)}else a=0==t.colorMode.indexOf("mix")?new s.Color(i+l*n):o.lerp(r,l);return a}onInit(){this.camera=new s.PerspectiveCamera(75,this.width/this.height,1,3e3),this.camera.position.z=350,this.fog=new s.Fog(16777215,100,1e3),this.mouseX=this.mouseY=0;const e=this.birds=[],t=this.boids=[],i=this.options;let n,o;if(a)try{this.initComputeRenderer(),this.valuesChanger=this.valuesChanger.bind(this),this.valuesChanger(),this.initGpgpuBirds()}catch(e){console.error("[vanta.js] birds init error: ",e)}else{const a=6*Math.pow(2,i.quantity);for(var r=0;r<a;r++){(n=t[r]=new p(i)).position.x=400*Math.random()-200,n.position.y=400*Math.random()-200,n.position.z=400*Math.random()-200,n.velocity.x=2*Math.random()-1,n.velocity.y=2*Math.random()-1,n.velocity.z=2*Math.random()-1,n.setWorldSize(500,500,300);const c=-1!=i.colorMode.indexOf("Gradient"),u=new d(i);for(var l=0;l<u.faces.length;l++)if(c)for(var h=0;h<3;h++){const e=this.getNewCol();u.faces[l].vertexColors[h]=e}else{const e=this.getNewCol(r/a);u.faces[l].vertexColors[0]=e,u.faces[l].vertexColors[1]=e,u.faces[l].vertexColors[2]=e}(o=e[r]=new s.Mesh(u,new s.MeshBasicMaterial({color:16777215,side:s.DoubleSide,vertexColors:s.VertexColors}))).phase=Math.floor(62.83*Math.random()),o.position.x=t[r].position.x,o.position.y=t[r].position.y,o.position.z=t[r].position.z,this.scene.add(o)}}}valuesChanger(){this.velocityUniforms&&(this.velocityUniforms.separationDistance.value=this.options.separation,this.velocityUniforms.alignmentDistance.value=this.options.alignment,this.velocityUniforms.speedLimit.value=this.options.speedLimit,this.velocityUniforms.cohesionDistance.value=this.options.cohesion)}onUpdate(){this.now=performance.now(),this.last||(this.last=this.now);let e=(this.now-this.last)/1e3;if(e>1&&(e=1),this.last=this.now,a)this.positionUniforms.time.value=this.now,this.positionUniforms.delta.value=e,this.velocityUniforms.time.value=this.now,this.velocityUniforms.delta.value=e,this.birdUniforms.time.value=this.now,this.birdUniforms.delta.value=e,this.velocityUniforms.predator.value.set(this.mouseX,-this.mouseY,0),this.mouseX=1e4,this.mouseY=1e4,this.gpuCompute.compute(),this.birdUniforms.texturePosition.value=this.gpuCompute.getCurrentRenderTarget(this.positionVariable).texture,this.birdUniforms.textureVelocity.value=this.gpuCompute.getCurrentRenderTarget(this.velocityVariable).texture;else{const e=this.birds,n=this.boids;let o,r;for(var t=0,i=e.length;t<i;t++)(o=n[t]).run(n),(r=e[t]).rotation.y=Math.atan2(-o.velocity.z,o.velocity.x),r.rotation.z=Math.asin(o.velocity.y/o.velocity.length()),r.phase=(r.phase+(Math.max(0,r.rotation.z)+.1))%62.83,r.geometry.vertices[5].y=r.geometry.vertices[4].y=5*Math.sin(r.phase)*this.options.birdSize,r.geometry.verticesNeedUpdate=!0,r.position.x=n[t].position.x,r.position.y=n[t].position.y,r.position.z=n[t].position.z}}onMouseMove(e,t){if(this.mouseX=e-.5,this.mouseY=t-.5,!a){const e=this.boids;let t;for(var i=new s.Vector3(this.mouseX*this.width,-this.mouseY*this.height,0),n=0,o=e.length;n<o;n++)t=e[n],i.z=t.position.z,t.repulse(i)}}onDestroy(){}onResize(){}}b.initClass();t.default=n.a.register("BIRDS",b)}})}));