soylog

2016年2月8日

			var group;
			var container, controls, stats;
			var particlesData = [];
			var camera, scene, renderer;
			var positions, colors;
			var particles;
			var pointCloud;
			var particlePositions;
			var linesMesh;

			var maxParticleCount = 1000;
			var particleCount = 500;
			var r = 800;
			var rHalf = r / 2;

			var effectController = {
				showDots: true,
				showLines: true,
				minDistance: 150,
				limitConnections: false,
				maxConnections: 20,
				particleCount: 500
			};

			init();
			animate();

			function initGUI() {

				var gui = new dat.GUI();

				gui.add( effectController, "showDots" ).onChange( function( value ) { pointCloud.visible = value; } );
				gui.add( effectController, "showLines" ).onChange( function( value ) { linesMesh.visible = value; } );
				gui.add( effectController, "minDistance", 10, 300 );
				gui.add( effectController, "limitConnections" );
				gui.add( effectController, "maxConnections", 0, 30, 1 );
				gui.add( effectController, "particleCount", 0, maxParticleCount, 1 ).onChange( function( value ) {

					particleCount = parseInt( value );
					particles.setDrawRange( 0, particleCount );

				});

			}

			function init() {

				initGUI();

				container = document.getElementById( 'container' );

				//

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 4000 );
				camera.position.z = 1750;

				controls = new THREE.OrbitControls( camera, container );

				scene = new THREE.Scene();


				group = new THREE.Group();
				scene.add( group );

				var helper = new THREE.BoxHelper( new THREE.Mesh( new THREE.BoxGeometry( r, r, r ) ) );
				helper.material.color.setHex( 0x080808 );
				helper.material.blending = THREE.AdditiveBlending;
				helper.material.transparent = true;
				group.add( helper );

				var segments = maxParticleCount * maxParticleCount;

				positions = new Float32Array( segments * 3 );
				colors = new Float32Array( segments * 3 );

				var pMaterial = new THREE.PointsMaterial( {
					color: 0xFFFFFF,
					size: 3,
					blending: THREE.AdditiveBlending,
					transparent: true,
					sizeAttenuation: false
				} );

				particles = new THREE.BufferGeometry();
				particlePositions = new Float32Array( maxParticleCount * 3 );

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

					var x = Math.random() * r - r / 2;
					var y = Math.random() * r - r / 2;
					var z = Math.random() * r - r / 2;

					particlePositions[ i * 3     ] = x;
					particlePositions[ i * 3 + 1 ] = y;
					particlePositions[ i * 3 + 2 ] = z;

					// add it to the geometry
					particlesData.push( {
						velocity: new THREE.Vector3( -1 + Math.random() * 2, -1 + Math.random() * 2,  -1 + Math.random() * 2 ),
						numConnections: 0
					} );

				}

				particles.setDrawRange( 0, particleCount );
				particles.addAttribute( 'position', new THREE.BufferAttribute( particlePositions, 3 ).setDynamic( true ) );

				// create the particle system
				pointCloud = new THREE.Points( particles, pMaterial );
				group.add( pointCloud );

				var geometry = new THREE.BufferGeometry();

				geometry.addAttribute( 'position', new THREE.BufferAttribute( positions, 3 ).setDynamic( true ) );
				geometry.addAttribute( 'color', new THREE.BufferAttribute( colors, 3 ).setDynamic( true ) );

				geometry.computeBoundingSphere();

				geometry.setDrawRange( 0, 0 );

				var material = new THREE.LineBasicMaterial( {
					vertexColors: THREE.VertexColors,
					blending: THREE.AdditiveBlending,
					transparent: true
				} );

				linesMesh = new THREE.LineSegments( geometry, material );
				group.add( linesMesh );

				//

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

				renderer.gammaInput = true;
				renderer.gammaOutput = true;

				container.appendChild( renderer.domElement );

				//

				stats = new Stats();
				stats.domElement.style.position = 'absolute';
				stats.domElement.style.top = '0px';
				container.appendChild( stats.domElement );

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

			}

			function onWindowResize() {

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

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

			}

			function animate() {

				var vertexpos = 0;
				var colorpos = 0;
				var numConnected = 0;

				for ( var i = 0; i < particleCount; i++ )
					particlesData[ i ].numConnections = 0;

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

					// get the particle
					var particleData = particlesData[i];

					particlePositions[ i * 3     ] += particleData.velocity.x;
					particlePositions[ i * 3 + 1 ] += particleData.velocity.y;
					particlePositions[ i * 3 + 2 ] += particleData.velocity.z;

					if ( particlePositions[ i * 3 + 1 ] < -rHalf || particlePositions[ i * 3 + 1 ] > rHalf )
						particleData.velocity.y = -particleData.velocity.y;

					if ( particlePositions[ i * 3 ] < -rHalf || particlePositions[ i * 3 ] > rHalf )
						particleData.velocity.x = -particleData.velocity.x;

					if ( particlePositions[ i * 3 + 2 ] < -rHalf || particlePositions[ i * 3 + 2 ] > rHalf )
						particleData.velocity.z = -particleData.velocity.z;

					if ( effectController.limitConnections && particleData.numConnections >= effectController.maxConnections )
						continue;

					// Check collision
					for ( var j = i + 1; j < particleCount; j++ ) {

						var particleDataB = particlesData[ j ];
						if ( effectController.limitConnections && particleDataB.numConnections >= effectController.maxConnections )
							continue;

						var dx = particlePositions[ i * 3     ] - particlePositions[ j * 3     ];
						var dy = particlePositions[ i * 3 + 1 ] - particlePositions[ j * 3 + 1 ];
						var dz = particlePositions[ i * 3 + 2 ] - particlePositions[ j * 3 + 2 ];
						var dist = Math.sqrt( dx * dx + dy * dy + dz * dz );

						if ( dist < effectController.minDistance ) {

							particleData.numConnections++;
							particleDataB.numConnections++;

							var alpha = 1.0 - dist / effectController.minDistance;

							positions[ vertexpos++ ] = particlePositions[ i * 3     ];
							positions[ vertexpos++ ] = particlePositions[ i * 3 + 1 ];
							positions[ vertexpos++ ] = particlePositions[ i * 3 + 2 ];

							positions[ vertexpos++ ] = particlePositions[ j * 3     ];
							positions[ vertexpos++ ] = particlePositions[ j * 3 + 1 ];
							positions[ vertexpos++ ] = particlePositions[ j * 3 + 2 ];

							colors[ colorpos++ ] = alpha;
							colors[ colorpos++ ] = alpha;
							colors[ colorpos++ ] = alpha;

							colors[ colorpos++ ] = alpha;
							colors[ colorpos++ ] = alpha;
							colors[ colorpos++ ] = alpha;

							numConnected++;
						}
					}
				}


				linesMesh.geometry.setDrawRange( 0, numConnected * 2 );
				linesMesh.geometry.attributes.position.needsUpdate = true;
				linesMesh.geometry.attributes.color.needsUpdate = true;

				pointCloud.geometry.attributes.position.needsUpdate = true;

				requestAnimationFrame( animate );

				stats.update();
				render();

			}

			function render() {

				var time = Date.now() * 0.001;

				group.rotation.y = time * 0.1;
				renderer.render( scene, camera );

			}

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var group;

var container, controls, stats;

var particlesData = [];

var camera, scene, renderer;

var positions, colors;

var particles;

var pointCloud;

var particlePositions;

var linesMesh;

var maxParticleCount = 1000;

var particleCount = 500;

var r = 800;

var rHalf = r / 2;

var effectController = {

showDots: true,

showLines: true,

minDistance: 150,

limitConnections: false,

maxConnections: 20,

particleCount: 500

};

init();

animate();

function initGUI() {

var gui = new dat.GUI();

gui.add( effectController, "showDots" ).onChange( function( value ) { pointCloud.visible = value; } );

gui.add( effectController, "showLines" ).onChange( function( value ) { linesMesh.visible = value; } );

gui.add( effectController, "minDistance", 10, 300 );

gui.add( effectController, "limitConnections" );

gui.add( effectController, "maxConnections", 0, 30, 1 );

gui.add( effectController, "particleCount", 0, maxParticleCount, 1 ).onChange( function( value ) {

particleCount = parseInt( value );

particles.setDrawRange( 0, particleCount );

});

}

function init() {

initGUI();

container = document.getElementById( 'container' );

camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 4000 );

camera.position.z = 1750;

controls = new THREE.OrbitControls( camera, container );

scene = new THREE.Scene();

group = new THREE.Group();

scene.add( group );

var helper = new THREE.BoxHelper( new THREE.Mesh( new THREE.BoxGeometry( r, r, r ) ) );

helper.material.color.setHex( 0x080808 );

helper.material.blending = THREE.AdditiveBlending;

helper.material.transparent = true;

group.add( helper );

var segments = maxParticleCount * maxParticleCount;

positions = new Float32Array( segments * 3 );

colors = new Float32Array( segments * 3 );

var pMaterial = new THREE.PointsMaterial( {

color: 0xFFFFFF,

size: 3,

blending: THREE.AdditiveBlending,

transparent: true,

sizeAttenuation: false

} );

particles = new THREE.BufferGeometry();

particlePositions = new Float32Array( maxParticleCount * 3 );

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

var x = Math.random() * r - r / 2;

var y = Math.random() * r - r / 2;

var z = Math.random() * r - r / 2;

particlePositions[ i * 3 ] = x;

particlePositions[ i * 3 + 1 ] = y;

particlePositions[ i * 3 + 2 ] = z;

// add it to the geometry

particlesData.push( {

velocity: new THREE.Vector3( -1 + Math.random() * 2, -1 + Math.random() * 2, -1 + Math.random() * 2 ),

numConnections: 0

} );

}

particles.setDrawRange( 0, particleCount );

particles.addAttribute( 'position', new THREE.BufferAttribute( particlePositions, 3 ).setDynamic( true ) );

// create the particle system

pointCloud = new THREE.Points( particles, pMaterial );

group.add( pointCloud );

var geometry = new THREE.BufferGeometry();

geometry.addAttribute( 'position', new THREE.BufferAttribute( positions, 3 ).setDynamic( true ) );

geometry.addAttribute( 'color', new THREE.BufferAttribute( colors, 3 ).setDynamic( true ) );

geometry.computeBoundingSphere();

geometry.setDrawRange( 0, 0 );

var material = new THREE.LineBasicMaterial( {

vertexColors: THREE.VertexColors,

blending: THREE.AdditiveBlending,

transparent: true

} );

linesMesh = new THREE.LineSegments( geometry, material );

group.add( linesMesh );

renderer = new THREE.WebGLRenderer( { antialias: true } );

renderer.setPixelRatio( window.devicePixelRatio );

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

renderer.gammaInput = true;

renderer.gammaOutput = true;

container.appendChild( renderer.domElement );

stats = new Stats();

stats.domElement.style.position = 'absolute';

stats.domElement.style.top = '0px';

container.appendChild( stats.domElement );

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

}

function onWindowResize() {

camera.aspect = window.innerWidth / window.innerHeight;

camera.updateProjectionMatrix();

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

}

function animate() {

var vertexpos = 0;

var colorpos = 0;

var numConnected = 0;

for ( var i = 0; i < particleCount; i++ )

particlesData[ i ].numConnections = 0;

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

// get the particle

var particleData = particlesData[i];

particlePositions[ i * 3 ] += particleData.velocity.x;

particlePositions[ i * 3 + 1 ] += particleData.velocity.y;

particlePositions[ i * 3 + 2 ] += particleData.velocity.z;

if ( particlePositions[ i * 3 + 1 ] < -rHalf || particlePositions[ i * 3 + 1 ] > rHalf )

particleData.velocity.y = -particleData.velocity.y;

if ( particlePositions[ i * 3 ] < -rHalf || particlePositions[ i * 3 ] > rHalf )

particleData.velocity.x = -particleData.velocity.x;

if ( particlePositions[ i * 3 + 2 ] < -rHalf || particlePositions[ i * 3 + 2 ] > rHalf )

particleData.velocity.z = -particleData.velocity.z;

if ( effectController.limitConnections && particleData.numConnections >= effectController.maxConnections )

continue;

// Check collision

for ( var j = i + 1; j < particleCount; j++ ) {

var particleDataB = particlesData[ j ];

if ( effectController.limitConnections && particleDataB.numConnections >= effectController.maxConnections )

continue;

var dx = particlePositions[ i * 3 ] - particlePositions[ j * 3 ];

var dy = particlePositions[ i * 3 + 1 ] - particlePositions[ j * 3 + 1 ];

var dz = particlePositions[ i * 3 + 2 ] - particlePositions[ j * 3 + 2 ];

var dist = Math.sqrt( dx * dx + dy * dy + dz * dz );

if ( dist < effectController.minDistance ) {

particleData.numConnections++;

particleDataB.numConnections++;

var alpha = 1.0 - dist / effectController.minDistance;

positions[ vertexpos++ ] = particlePositions[ i * 3 ];

positions[ vertexpos++ ] = particlePositions[ i * 3 + 1 ];

positions[ vertexpos++ ] = particlePositions[ i * 3 + 2 ];

positions[ vertexpos++ ] = particlePositions[ j * 3 ];

positions[ vertexpos++ ] = particlePositions[ j * 3 + 1 ];

positions[ vertexpos++ ] = particlePositions[ j * 3 + 2 ];

colors[ colorpos++ ] = alpha;

numConnected++;

}

linesMesh.geometry.setDrawRange( 0, numConnected * 2 );

linesMesh.geometry.attributes.position.needsUpdate = true;

linesMesh.geometry.attributes.color.needsUpdate = true;

pointCloud.geometry.attributes.position.needsUpdate = true;

requestAnimationFrame( animate );

stats.update();

render();

}

function render() {

var time = Date.now() * 0.001;

group.rotation.y = time * 0.1;

renderer.render( scene, camera );

}

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