javascript
/
three.js
réplica de https://github.com/tazdij/three.js.git


			
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							<!doctype html>
<html lang="en">
	<head>
		<title>three.js webgl - postprocessing - godrays</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				background-color: #000000;
				margin: 0px;
				overflow: hidden;
				font-family:Monospace;
				font-size:13px;
				text-align:center;
				font-weight: bold;
				text-align:center;
			}

			a {
				color:#0078ff;
			}

			#info {
				color:#fff;
				position: absolute;
				top: 0px; width: 100%;
				padding: 5px;
				z-index:100;
			}
		</style>
	</head>

	<body>
		<script src="../build/Three.js"></script>

		<script src="js/Detector.js"></script>
		<script src="js/ShaderGodRays.js"></script>
		<script src="js/Stats.js"></script>

		<div id="info">
			<a href="http://github.com/mrdoob/three.js" target="_blank">three.js</a> - webgl god-rays example - tree by <a href="http://www.turbosquid.com/3d-models/free-tree-3d-model/592617" target="_blank">stanloshka</a>
		</div>


		<script>

			if ( ! Detector.webgl ) Detector.addGetWebGLMessage();

			var container, stats;
			var camera, scene, renderer, parameters, material_depth;
			
			var tree_mesh, sphere_mesh;

			var proj = new THREE.Projector();
			var sunPos = new THREE.Vector3( 0, 1000, -1000 );

			var mouseX = 0, mouseY = 0;

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

			var height = window.innerHeight-100;

			var postprocessing = { enabled  : true };

			init();
			animate();

			function init() {

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

				scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / height, 1, 3000 );
				camera.position.z = 200;
				scene.add( camera );

				renderer = new THREE.WebGLRenderer( { antialias: false } );
				renderer.setSize( window.innerWidth, height );
				container.appendChild( renderer.domElement );

				renderer.sortObjects = false;

				// todo - try with fog
				//scene.fog = new THREE.Fog( 0xffaa55, 1000, FAR );
				//THREE.ColorUtils.adjustHSV( scene.fog.color, 0.02, -0.15, -0.65 );

				material_depth = new THREE.MeshDepthMaterial();

				parameters = { color: 0x000000, shading: THREE.FlatShading };
				var zmat = new THREE.MeshBasicMaterial( parameters );

				// tree mesh	
				var jsonLoader = new THREE.JSONLoader();
				jsonLoader.load( "obj/tree/tree.js", function( geometry ) {

					var m = new THREE.Mesh( geometry, zmat );
					m.position.set( 0, -150, -150 );

					var sc = 400;
					m.scale.set( sc, sc, sc );
					m.matrixAutoUpdate = false;
					m.updateMatrix();
					scene.add( m );
					tree_mesh = m;

				} );

				var geo = new THREE.SphereGeometry( 1, 20, 10 );
				mesh = new THREE.Mesh( geo, zmat );

				var sc = 20;
				mesh.scale.set( sc, sc, sc );

				mesh.matrixAutoUpdate = false;
				mesh.updateMatrix();

				scene.add( mesh );
				sphere_mesh = mesh;
				
				scene.matrixAutoUpdate = false;

				initPostprocessing();

				renderer.autoClear = false;
				renderer.setClearColorHex( 0x000033, 1);

				renderer.domElement.style.position = 'absolute';
				renderer.domElement.style.top = "50px";
				renderer.domElement.style.left = "0px";

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

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

			}

			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 initPostprocessing() {

				postprocessing.scene = new THREE.Scene();

				postprocessing.camera = new THREE.OrthographicCamera( window.innerWidth / - 2, window.innerWidth / 2,  window.innerHeight / 2, window.innerHeight / - 2, -10000, 10000 );
				postprocessing.camera.position.z = 100;

				postprocessing.scene.add( postprocessing.camera );

				var pars = { minFilter: THREE.LinearFilter, magFilter: THREE.LinearFilter, format: THREE.RGBFormat };
				postprocessing.rtTextureColors = new THREE.WebGLRenderTarget( window.innerWidth, height, pars );
				
				// Switching the depth formats to luminance from rgb doesn't seem to work. I didn't
				// investigate further for now.
				// pars.format = THREE.LuminanceFormat;
				
				// I would have this quarter size and use it as one of the ping-pong render
				// targets but the aliasing causes some temporal flickering
				postprocessing.rtTextureDepth = new THREE.WebGLRenderTarget( window.innerWidth, height, pars );
				
				// Aggressive downsize god-ray ping-pong render targets to minimize cost 
				var w = window.innerWidth / 4.0;
				var h = height / 4.0;
				postprocessing.rtTextureGodRays1 = new THREE.WebGLRenderTarget( w, h, pars );
				postprocessing.rtTextureGodRays2 = new THREE.WebGLRenderTarget( w, h, pars );
				
				// god-ray shaders

				var godray_gen_shader = THREE.ShaderGodRays[ "godrays_generate" ];
				postprocessing.godray_gen_uniforms = THREE.UniformsUtils.clone( godray_gen_shader.uniforms );
				postprocessing.materialGodraysGenerate = new THREE.ShaderMaterial( {

					uniforms: postprocessing.godray_gen_uniforms,
					vertexShader: godray_gen_shader.vertexShader,
					fragmentShader: godray_gen_shader.fragmentShader

				} );

				var godrays_combine_shader = THREE.ShaderGodRays[ "godrays_combine" ];
				postprocessing.godray_combine_uniforms = THREE.UniformsUtils.clone( godrays_combine_shader.uniforms );
				postprocessing.materialGodraysCombine = new THREE.ShaderMaterial( {

					uniforms: postprocessing.godray_combine_uniforms,
					vertexShader: godrays_combine_shader.vertexShader,
					fragmentShader: godrays_combine_shader.fragmentShader

				} );

				var godrays_fake_sun_shader = THREE.ShaderGodRays[ "godrays_fake_sun" ];
				postprocessing.godrays_fake_sun_uniforms = THREE.UniformsUtils.clone( godrays_fake_sun_shader.uniforms );
				postprocessing.materialGodraysFakeSun = new THREE.ShaderMaterial( {

					uniforms: postprocessing.godrays_fake_sun_uniforms,
					vertexShader: godrays_fake_sun_shader.vertexShader,
					fragmentShader: godrays_fake_sun_shader.fragmentShader

				} );
				
				postprocessing.quad = new THREE.Mesh( new THREE.PlaneGeometry( window.innerWidth, window.innerHeight ), postprocessing.materialGodraysGenerate );
				postprocessing.quad.position.z = -9900;
				postprocessing.quad.rotation.x = Math.PI / 2;
				postprocessing.scene.add( postprocessing.quad );

			}

			function animate() {

				requestAnimationFrame( animate, renderer.domElement );
				
				render();
				stats.update();

			}

			function render() {

				if ( sphere_mesh ) {

					var radius = 100;
					sphere_mesh.position.x = 200*Math.cos(Date.now()/4000);
					sphere_mesh.position.z = 200*Math.sin(Date.now()/4000)-100;
					sphere_mesh.updateMatrix();

				}

				camera.position.x += ( mouseX - camera.position.x ) * 0.036;
				camera.position.y += ( - (mouseY) - camera.position.y ) * 0.036;

				camera.lookAt( scene.position );
				
				if ( postprocessing.enabled ) {

					// Find the screenspace position of the sun
					var sspos = new THREE.Vector3( sunPos.x, sunPos.y, sunPos.z);
					proj.projectVector(sspos,camera);
					sspos.x = (sspos.x+1)/2;
					sspos.y = (sspos.y+1)/2;

					// Give it to the god-ray and sun shaders
					postprocessing.godray_gen_uniforms[ "vSunPositionScreenSpace" ].value = new THREE.Vector2(sspos.x,sspos.y);
					postprocessing.godrays_fake_sun_uniforms[ "vSunPositionScreenSpace" ].value = new THREE.Vector2(sspos.x,sspos.y);
					
					// -- Draw sky and sun --
					
					// Clear colors and depths, will clear to sky color
					renderer.clearTarget(postprocessing.rtTextureColors,true,true,false);
					
					// Sun render. Runs a shader that gives a brightness based on the screen
					// space distance to the sun. Not very efficient, so i make a scissor
					// rect around the suns position to avoid rendering surrounding pixels.
					var sunsqH = 0.74 * height; // .74 depends on extent of sun from shader
					var sunsqW = 0.74 * height; // both dep on height because sun is aspect-corrected
					sspos.x *= window.innerWidth;
					sspos.y *= height;
					renderer.setScissor( sspos.x-sunsqW/2,sspos.y-sunsqH/2,sunsqW,sunsqH );
					renderer.enableScissorTest( true );
					postprocessing.godrays_fake_sun_uniforms[ "fAspect" ].value = window.innerWidth / height;
					postprocessing.scene.overrideMaterial = postprocessing.materialGodraysFakeSun;
					renderer.render( postprocessing.scene, postprocessing.camera, postprocessing.rtTextureColors );
					renderer.enableScissorTest( false );
					
					// -- Draw scene objects --
					
					// Colors
					scene.overrideMaterial = null;
					renderer.render( scene, camera, postprocessing.rtTextureColors );
					
					// Depth
					scene.overrideMaterial = material_depth;
					renderer.render( scene, camera, postprocessing.rtTextureDepth, true );

					// -- Render god-rays --

					// Maximum length of god-rays (in texture space [0,1]X[0,1])
					var filterLen = 1.0;
					// Samples taken by filter
					var TAPS_PER_PASS = 6.0;

					// Pass order could equivalently be 3,2,1 (instead of 1,2,3), which
					// would start with a small filter support and grow to large. however
					// the large-to-small order produces less objectionable aliasing artifacts that
					// appear as a glimmer along the length of the beams

					// pass 1 - render into first ping-pong target
					var pass = 1.0;
					var stepLen = filterLen*Math.pow(TAPS_PER_PASS, -pass);
					postprocessing.godray_gen_uniforms[ "fStepSize" ].value = stepLen;
					postprocessing.godray_gen_uniforms[ "tInput" ].texture = postprocessing.rtTextureDepth;
					postprocessing.scene.overrideMaterial = postprocessing.materialGodraysGenerate;
					renderer.render( postprocessing.scene, postprocessing.camera, postprocessing.rtTextureGodRays2 );

					// pass 2 - render into second ping-pong target
					pass = 2.0;
					stepLen = filterLen*Math.pow(TAPS_PER_PASS, -pass);
					postprocessing.godray_gen_uniforms[ "fStepSize" ].value = stepLen;
					postprocessing.godray_gen_uniforms[ "tInput" ].texture = postprocessing.rtTextureGodRays2;
					renderer.render( postprocessing.scene, postprocessing.camera , postprocessing.rtTextureGodRays1  );

					// pass 3 - 1st RT
					pass = 3.0;
					stepLen = filterLen*Math.pow(TAPS_PER_PASS, -pass);
					postprocessing.godray_gen_uniforms[ "fStepSize" ].value = stepLen;
					postprocessing.godray_gen_uniforms[ "tInput" ].texture = postprocessing.rtTextureGodRays1;
					renderer.render( postprocessing.scene, postprocessing.camera , postprocessing.rtTextureGodRays2  );

					// final pass - composite god-rays onto colors
					postprocessing.godray_combine_uniforms["tColors"].texture = postprocessing.rtTextureColors;
					postprocessing.godray_combine_uniforms["tGodRays"].texture = postprocessing.rtTextureGodRays2;
					postprocessing.scene.overrideMaterial = postprocessing.materialGodraysCombine;
					renderer.render( postprocessing.scene, postprocessing.camera );
					postprocessing.scene.overrideMaterial = null;

				} else {

					renderer.clear();
					renderer.render( scene, camera );

				}

			}
		</script>
	</body>
</html>