javascript
/
three.js
зеркало из https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - gpgpu - flocking</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<link type="text/css" rel="stylesheet" href="main.css">
		<style>
			body {
				background-color: #fff;
				color: #444;
			}
			a {
				color:#08f;
			}
		</style>
	</head>
	<body>

		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl gpgpu birds + GLTF mesh<br/>
			Flamingo by <a href="http://mirada.com/">mirada</a> from <a href="http://ro.me">rome</a><br/>
			Move mouse to disturb birds. 
		</div>

		<!-- shader for bird's position -->
		<script id="fragmentShaderPosition" type="x-shader/x-fragment">

			uniform float time;
			uniform float delta;

			void main()	{

				vec2 uv = gl_FragCoord.xy / resolution.xy;
				vec4 tmpPos = texture2D( texturePosition, uv );
				vec3 position = tmpPos.xyz;
				vec3 velocity = texture2D( textureVelocity, uv ).xyz;

				float phase = tmpPos.w;

				phase = mod( ( phase + delta +
					length( velocity.xz ) * delta * 3. +
					max( velocity.y, 0.0 ) * delta * 6. ), 62.83 );

				gl_FragColor = vec4( position + velocity * delta * 15. , phase );

			}

		</script>

		<!-- shader for bird's velocity -->
		<script id="fragmentShaderVelocity" type="x-shader/x-fragment">

			uniform float time;
			uniform float testing;
			uniform float delta; // about 0.016
			uniform float separationDistance; // 20
			uniform float alignmentDistance; // 40
			uniform float cohesionDistance; //
			uniform float freedomFactor;
			uniform vec3 predator;

			const float width = resolution.x;
			const float height = resolution.y;

			const float PI = 3.141592653589793;
			const float PI_2 = PI * 2.0;
			// const float VISION = PI * 0.55;

			float zoneRadius = 40.0;
			float zoneRadiusSquared = 1600.0;

			float separationThresh = 0.45;
			float alignmentThresh = 0.65;

			const float UPPER_BOUNDS = BOUNDS;
			const float LOWER_BOUNDS = -UPPER_BOUNDS;

			const float SPEED_LIMIT = 9.0;

			float rand( vec2 co ){
				return fract( sin( dot( co.xy, vec2(12.9898,78.233) ) ) * 43758.5453 );
			}

			void main() {

				zoneRadius = separationDistance + alignmentDistance + cohesionDistance;
				separationThresh = separationDistance / zoneRadius;
				alignmentThresh = ( separationDistance + alignmentDistance ) / zoneRadius;
				zoneRadiusSquared = zoneRadius * zoneRadius;


				vec2 uv = gl_FragCoord.xy / resolution.xy;
				vec3 birdPosition, birdVelocity;

				vec3 selfPosition = texture2D( texturePosition, uv ).xyz;
				vec3 selfVelocity = texture2D( textureVelocity, uv ).xyz;

				float dist;
				vec3 dir; // direction
				float distSquared;

				float separationSquared = separationDistance * separationDistance;
				float cohesionSquared = cohesionDistance * cohesionDistance;

				float f;
				float percent;

				vec3 velocity = selfVelocity;

				float limit = SPEED_LIMIT;

				dir = predator * UPPER_BOUNDS - selfPosition;
				dir.z = 0.;
				// dir.z *= 0.6;
				dist = length( dir );
				distSquared = dist * dist;

				float preyRadius = 150.0;
				float preyRadiusSq = preyRadius * preyRadius;


				// move birds away from predator
				if ( dist < preyRadius ) {

					f = ( distSquared / preyRadiusSq - 1.0 ) * delta * 100.;
					velocity += normalize( dir ) * f;
					limit += 5.0;
				}


				// if (testing == 0.0) {}
				// if ( rand( uv + time ) < freedomFactor ) {}


				// Attract flocks to the center
				vec3 central = vec3( 0., 0., 0. );
				dir = selfPosition - central;
				dist = length( dir );

				dir.y *= 2.5;
				velocity -= normalize( dir ) * delta * 5.;

				for ( float y = 0.0; y < height; y++ ) {
					for ( float x = 0.0; x < width; x++ ) {

						vec2 ref = vec2( x + 0.5, y + 0.5 ) / resolution.xy;
						birdPosition = texture2D( texturePosition, ref ).xyz;

						dir = birdPosition - selfPosition;
						dist = length( dir );

						if ( dist < 0.0001 ) continue;

						distSquared = dist * dist;

						if ( distSquared > zoneRadiusSquared ) continue;

						percent = distSquared / zoneRadiusSquared;

						if ( percent < separationThresh ) { // low

							// Separation - Move apart for comfort
							f = ( separationThresh / percent - 1.0 ) * delta;
							velocity -= normalize( dir ) * f;

						} else if ( percent < alignmentThresh ) { // high

							// Alignment - fly the same direction
							float threshDelta = alignmentThresh - separationThresh;
							float adjustedPercent = ( percent - separationThresh ) / threshDelta;

							birdVelocity = texture2D( textureVelocity, ref ).xyz;

							f = ( 0.5 - cos( adjustedPercent * PI_2 ) * 0.5 + 0.5 ) * delta;
							velocity += normalize( birdVelocity ) * f;

						} else {

							// Attraction / Cohesion - move closer
							float threshDelta = 1.0 - alignmentThresh;
							float adjustedPercent = ( percent - alignmentThresh ) / threshDelta;

							f = ( 0.5 - ( cos( adjustedPercent * PI_2 ) * -0.5 + 0.5 ) ) * delta;

							velocity += normalize( dir ) * f;

						}

					}

				}

				// this make tends to fly around than down or up
				// if (velocity.y > 0.) velocity.y *= (1. - 0.2 * delta);

				// Speed Limits
				if ( length( velocity ) > limit ) {
					velocity = normalize( velocity ) * limit;
				}

				gl_FragColor = vec4( velocity, 1.0 );

			}

		</script>

		<script type="module">

			import * as THREE from '../build/three.module.js';
			import Stats from './jsm/libs/stats.module.js';
			import { GUI } from './jsm/libs/dat.gui.module.js';
			import { GLTFLoader } from './jsm/loaders/GLTFLoader.js';
			import { GPUComputationRenderer } from './jsm/misc/GPUComputationRenderer.js';

			/* TEXTURE WIDTH FOR SIMULATION */
			var WIDTH = 64
			var BIRDS = WIDTH * WIDTH;
			
			/* BAKE ANIMATION INTO TEXTURE and CREATE GEOMETRY FROM BASE MODEL */
			var BirdGeometry = new THREE.BufferGeometry();
			var textureAnimation, durationAnimation, originalMaterial,birdMesh, materialShader, vertexPerBird;
			function nextPowerOf2( n ) { return Math.pow( 2, Math.ceil( Math.log( n ) / Math.log( 2 ) ) ) };

			Math.lerp = function (value1, value2, amount) {

				amount = Math.max( Math.min( amount, 1 ), 0 );
				return value1 + (value2 - value1) * amount;
				
			};

			var geos = [ 'Parrot', 'Flamingo', 'Horse' ]
			var colors = [ 0xccFFFF, 0xffdeff, 0xffdede ]
			var selectModel = Math.floor( Math.random() * geos.length )
			new GLTFLoader().load( 'models/gltf/' + geos[ selectModel ] + '.glb', function ( gltf ) {

				var animations = gltf.animations;
				durationAnimation = Math.round( animations[ 0 ].duration * 60 );
				var birdGeo = gltf.scene.children[ 0 ].geometry;
				originalMaterial = gltf.scene.children[ 0 ].material;
				var morphAttributes = birdGeo.morphAttributes.position;
				var tHeight = nextPowerOf2( durationAnimation );
				var tWidth = nextPowerOf2( birdGeo.getAttribute( 'position' ).count );
				vertexPerBird = birdGeo.getAttribute( 'position' ).count;
				var tData = new Float32Array( 3 * tWidth * tHeight );

				for( var i = 0 ; i < tWidth ; i++ ){

					for( var j = 0 ; j < tHeight ; j++ ){

						var offset = j * tWidth * 3;

						var curFrame = j;
						var curMorph = Math.floor( j / durationAnimation * morphAttributes.length );
						var nextMorph = ( Math.floor( j / durationAnimation * morphAttributes.length ) + 1 ) % morphAttributes.length;
						var lerpAmount = j / durationAnimation * morphAttributes.length % 1;

						if( j < durationAnimation ){

							tData[ offset + i * 3 ] = Math.lerp( morphAttributes[ curMorph ].array[ i * 3 ], morphAttributes[ nextMorph ].array[ i * 3 ], lerpAmount );
							tData[ offset + i * 3 + 1 ] = Math.lerp( morphAttributes[ curMorph ].array[ i * 3 + 1 ], morphAttributes[ nextMorph ].array[ i * 3 + 1 ], lerpAmount );
							tData[ offset + i * 3 + 2 ] = Math.lerp( morphAttributes[ curMorph ].array[ i * 3 + 2 ], morphAttributes[ nextMorph ].array[ i * 3 + 2 ], lerpAmount );
						
						}
					}

				}
				
				textureAnimation = new THREE.DataTexture( tData, tWidth, tHeight, THREE.RGBFormat, THREE.FloatType );
				textureAnimation.needsUpdate = true;

				var vertices = [], color = [], reference = [], seeds = [], indices = [];
				var totalVertices = birdGeo.getAttribute( 'position' ).count * 3 * BIRDS;
				for( var i = 0 ; i < totalVertices ; i++ ){

					var bIndex = i % ( birdGeo.getAttribute( 'position' ).count * 3 );
					vertices.push( birdGeo.getAttribute( 'position' ).array[ bIndex ] );
					color.push( birdGeo.getAttribute( 'color' ).array[ bIndex ] );

				}

				var r = Math.random();
				for( var i = 0 ; i < birdGeo.getAttribute( 'position' ).count * BIRDS ; i++ ){
					
					var bIndex = i % ( birdGeo.getAttribute( 'position' ).count );
					var bird = Math.floor( i / birdGeo.getAttribute( 'position' ).count );
					if( bIndex == 0 ) r = Math.random();
					var j = ~ ~ bird;
					var x = ( j % WIDTH ) / WIDTH;
					var y = ~ ~ ( j / WIDTH ) / WIDTH;
					reference.push( x, y, bIndex / tWidth, durationAnimation / tHeight );
					seeds.push( bird, r, Math.random(), Math.random() );

				}

				for( var i = 0 ; i < birdGeo.index.array.length * BIRDS ; i++ ){

					var offset = Math.floor( i / birdGeo.index.array.length ) * ( birdGeo.getAttribute( 'position' ).count );				
					indices.push( birdGeo.index.array[ i % birdGeo.index.array.length ] + offset );

				}

				BirdGeometry.setAttribute( 'position', new THREE.BufferAttribute( new Float32Array( vertices ), 3 ) );
				BirdGeometry.setAttribute( 'birdColor', new THREE.BufferAttribute( new Float32Array( color ), 3 ) );
				BirdGeometry.setAttribute( 'color', new THREE.BufferAttribute( new Float32Array( color ), 3 ) );
				BirdGeometry.setAttribute( 'reference', new THREE.BufferAttribute( new Float32Array( reference ), 4 ) );
				BirdGeometry.setAttribute( 'seeds', new THREE.BufferAttribute( new Float32Array( seeds ), 4 ) );

				BirdGeometry.setIndex( indices );

				init();
				animate();

			} );

			var container, stats;
			var camera, scene, renderer;
			var mouseX = 0, mouseY = 0;

			var windowHalfX = window.innerWidth / 2;
			var windowHalfY = window.innerHeight / 2;

			var BOUNDS = 800, BOUNDS_HALF = BOUNDS / 2;

			var last = performance.now();

			var gpuCompute;
			var velocityVariable;
			var positionVariable;
			var positionUniforms;
			var velocityUniforms;
			var birdUniforms;

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 3000 );
				camera.position.z = 350;

				scene = new THREE.Scene();
				scene.background = new THREE.Color( colors[ selectModel ] );
				scene.fog = new THREE.Fog( colors[ selectModel ], 100, 1000 );

				// LIGHTS

				var hemiLight = new THREE.HemisphereLight( colors[ selectModel ], 0xffffff, 1.6 );
				hemiLight.color.setHSL( 0.6, 1, 0.6 );
				hemiLight.groundColor.setHSL( 0.095, 1, 0.75 );
				hemiLight.position.set( 0, 50, 0 );
				scene.add( hemiLight );

				var dirLight = new THREE.DirectionalLight( 0x00CED1, 0.6 );
				dirLight.color.setHSL( 0.1, 1, 0.95 );
				dirLight.position.set( - 1, 1.75, 1 );
				dirLight.position.multiplyScalar( 30 );
				scene.add( dirLight );

				renderer = new THREE.WebGLRenderer( { antialias : true, alpha : true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );

				initComputeRenderer();

				stats = new Stats();
				container.appendChild( stats.dom );

				document.addEventListener( 'mousemove', onDocumentMouseMove, false );
				document.addEventListener( 'touchstart', onDocumentTouchStart, false );
				document.addEventListener( 'touchmove', onDocumentTouchMove, false );

				window.addEventListener( 'resize', onWindowResize, false );

				var gui = new GUI();

				var effectController = {

					separation: 20.0,
					alignment: 20.0,
					cohesion: 20.0,
					freedom: 0.75,
					size: 0.1,
					count: BIRDS

				};

				var valuesChanger = function () {

					velocityUniforms[ "separationDistance" ].value = effectController.separation;
					velocityUniforms[ "alignmentDistance" ].value = effectController.alignment;
					velocityUniforms[ "cohesionDistance" ].value = effectController.cohesion;
					velocityUniforms[ "freedomFactor" ].value = effectController.freedom;
					if( materialShader ) materialShader.uniforms[ "size" ].value = effectController.size;
					BirdGeometry.setDrawRange ( 0, vertexPerBird * effectController.count )

				};

				valuesChanger();

				gui.add( effectController, "separation", 0.0, 100.0, 1.0 ).onChange( valuesChanger );
				gui.add( effectController, "alignment", 0.0, 100, 0.001 ).onChange( valuesChanger );
				gui.add( effectController, "cohesion", 0.0, 100, 0.025 ).onChange( valuesChanger );
				gui.add( effectController, "size", 0, 1, 0.01 ).onChange( valuesChanger );
				gui.add( effectController, "count", 0, BIRDS, 1 ).onChange( valuesChanger );
				gui.close();

				initBirds();

			}

			function initComputeRenderer() {

				gpuCompute = new GPUComputationRenderer( WIDTH, WIDTH, renderer );

				var dtPosition = gpuCompute.createTexture();
				var dtVelocity = gpuCompute.createTexture();
				fillPositionTexture( dtPosition );
				fillVelocityTexture( dtVelocity );

				velocityVariable = gpuCompute.addVariable( "textureVelocity", document.getElementById( 'fragmentShaderVelocity' ).textContent, dtVelocity );
				positionVariable = gpuCompute.addVariable( "texturePosition", document.getElementById( 'fragmentShaderPosition' ).textContent, dtPosition );

				gpuCompute.setVariableDependencies( velocityVariable, [ positionVariable, velocityVariable ] );
				gpuCompute.setVariableDependencies( positionVariable, [ positionVariable, velocityVariable ] );

				positionUniforms = positionVariable.material.uniforms;
				velocityUniforms = velocityVariable.material.uniforms;

				positionUniforms[ "time" ] = { value: 0.0 };
				positionUniforms[ "delta" ] = { value: 0.0 };
				velocityUniforms[ "time" ] = { value: 1.0 };
				velocityUniforms[ "delta" ] = { value: 0.0 };
				velocityUniforms[ "testing" ] = { value: 1.0 };
				velocityUniforms[ "separationDistance" ] = { value: 1.0 };
				velocityUniforms[ "alignmentDistance" ] = { value: 1.0 };
				velocityUniforms[ "cohesionDistance" ] = { value: 1.0 };
				velocityUniforms[ "freedomFactor" ] = { value: 1.0 };
				velocityUniforms[ "predator" ] = { value: new THREE.Vector3() };
				velocityVariable.material.defines.BOUNDS = BOUNDS.toFixed( 2 );

				velocityVariable.wrapS = THREE.RepeatWrapping;
				velocityVariable.wrapT = THREE.RepeatWrapping;
				positionVariable.wrapS = THREE.RepeatWrapping;
				positionVariable.wrapT = THREE.RepeatWrapping;
				
				var error = gpuCompute.init();
				if ( error !== null ) {
				    console.error( error );
				}
			}

			function initBirds() {

				var geometry = BirdGeometry;

				var m = new THREE.MeshStandardMaterial({
					vertexColors : true,
					flatShading : true,
					roughness : 1,
					metalness : 0
				})

				m.onBeforeCompile = ( shader ) => {

					shader.uniforms.texturePosition = { value : null };
					shader.uniforms.textureVelocity = { value : null };
					shader.uniforms.textureAnimation = { value : textureAnimation };
					shader.uniforms.time = { value : 1.0 };
					shader.uniforms.size = { value : 0.1 };
					shader.uniforms.delta = { value : 0.0 };

					var token = '#define STANDARD';
        			var insert = 'attribute vec4 reference;';
					insert += 'attribute vec4 seeds;';
					insert += 'attribute vec3 birdColor;';
					insert += 'uniform sampler2D texturePosition;';
					insert += 'uniform sampler2D textureVelocity;';
					insert += 'uniform sampler2D textureAnimation;';
					insert += 'uniform float size;';
					insert += 'uniform float time;';

					shader.vertexShader = shader.vertexShader.replace( token, token + '\n' + insert );

					var token = '#include <begin_vertex>';
					var insert = 'vec4 tmpPos = texture2D( texturePosition, reference.xy );';
				
					insert += 'vec3 pos = tmpPos.xyz;';
					insert += 'vec3 velocity = normalize(texture2D( textureVelocity, reference.xy ).xyz);';
					insert += 'vec3 aniPos = texture2D( textureAnimation, vec2( reference.z, mod( ( time + seeds.x ) * ( ( 0.0004 + seeds.y / 10000.0) + normalize( velocity ) / 20000.0 ), reference.w ) ) ).xyz;';
					insert += 'vec3 newPosition = position;';
					
					insert += 'newPosition = mat3( modelMatrix ) * ( newPosition + aniPos );';
					insert += 'newPosition *= size + seeds.y * size * 0.2;';
					
					insert += 'velocity.z *= -1.;';
					insert += 'float xz = length( velocity.xz );';
					insert += 'float xyz = 1.;';
					insert += 'float x = sqrt( 1. - velocity.y * velocity.y );';

					insert += 'float cosry = velocity.x / xz;';
					insert += 'float sinry = velocity.z / xz;';

					insert += 'float cosrz = x / xyz;';
					insert += 'float sinrz = velocity.y / xyz;';

					insert += 'mat3 maty =  mat3( cosry, 0, -sinry, 0    , 1, 0     , sinry, 0, cosry );';
					insert += 'mat3 matz =  mat3( cosrz , sinrz, 0, -sinrz, cosrz, 0, 0     , 0    , 1 );';

					insert += 'newPosition =  maty * matz * newPosition;';
					insert += 'newPosition += pos;';
					
					insert += 'vec3 transformed = vec3( newPosition );';
					
        			shader.vertexShader = shader.vertexShader.replace( token, insert );

					materialShader = shader;

				}    

				birdMesh = new THREE.Mesh( geometry, m );
				birdMesh.rotation.y = Math.PI / 2;
				
				birdMesh.castShadow = true;
				birdMesh.receiveShadow = true;

				scene.add( birdMesh );

			}

			function fillPositionTexture( texture ) {

				var theArray = texture.image.data;

				for ( var k = 0, kl = theArray.length; k < kl; k += 4 ) {

					var x = Math.random() * BOUNDS - BOUNDS_HALF;
					var y = Math.random() * BOUNDS - BOUNDS_HALF;
					var z = Math.random() * BOUNDS - BOUNDS_HALF;

					theArray[ k + 0 ] = x;
					theArray[ k + 1 ] = y;
					theArray[ k + 2 ] = z;
					theArray[ k + 3 ] = 1;

				}

			}

			function fillVelocityTexture( texture ) {

				var theArray = texture.image.data;

				for ( var k = 0, kl = theArray.length; k < kl; k += 4 ) {

					var x = Math.random() - 0.5;
					var y = Math.random() - 0.5;
					var z = Math.random() - 0.5;

					theArray[ k + 0 ] = x * 10;
					theArray[ k + 1 ] = y * 10;
					theArray[ k + 2 ] = z * 10;
					theArray[ k + 3 ] = 1;

				}

			}


			function onWindowResize() {

				windowHalfX = window.innerWidth / 2;
				windowHalfY = window.innerHeight / 2;

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function onDocumentMouseMove( event ) {

				mouseX = event.clientX - windowHalfX;
				mouseY = event.clientY - windowHalfY;

			}

			function onDocumentTouchStart( event ) {

				if ( event.touches.length === 1 ) {

					event.preventDefault();

					mouseX = event.touches[ 0 ].pageX - windowHalfX;
					mouseY = event.touches[ 0 ].pageY - windowHalfY;

				}

			}

			function onDocumentTouchMove( event ) {

				if ( event.touches.length === 1 ) {

					event.preventDefault();

					mouseX = event.touches[ 0 ].pageX - windowHalfX;
					mouseY = event.touches[ 0 ].pageY - windowHalfY;

				}

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}

			function render() {

				var now = performance.now();
				var delta = ( now - last ) / 1000;
				
				if ( delta > 1 ) delta = 1; // safety cap on large deltas
				last = now;

				positionUniforms[ "time" ].value = now;
				positionUniforms[ "delta" ].value = delta;
				velocityUniforms[ "time" ].value = now;
				velocityUniforms[ "delta" ].value = delta;
				if( materialShader ) materialShader.uniforms[ "time" ].value = now;
				if( materialShader ) materialShader.uniforms[ "delta" ].value = delta;

				velocityUniforms[ "predator" ].value.set( 0.5 * mouseX / windowHalfX, - 0.5 * mouseY / windowHalfY, 0 );

				mouseX = 10000;
				mouseY = 10000;

				gpuCompute.compute();
				
				if( materialShader ) materialShader.uniforms[ "texturePosition" ].value = gpuCompute.getCurrentRenderTarget( positionVariable ).texture;
				if( materialShader ) materialShader.uniforms[ "textureVelocity" ].value = gpuCompute.getCurrentRenderTarget( velocityVariable ).texture;
				
				renderer.render( scene, camera );
			}

		</script>
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