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


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - materials - wireframe</title>
		<meta charset="utf-8">
		<style>
			body {
				margin: 0px;
				background-color: #000000;
				overflow: hidden;
			}
		</style>
	</head>
	<body>

		<script src="../build/three.min.js"></script>

		<script type="x-shader/x-vertex" id="vertexShader">

			attribute vec3 center;
			varying vec3 vCenter;

			void main() {

				vCenter = center;
				gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );

			}

		</script>

		<script type="x-shader/x-fragment" id="fragmentShader">

			#extension GL_OES_standard_derivatives : enable

			varying vec3 vCenter;

			float edgeFactorTri() {

				vec3 d = fwidth( vCenter.xyz );
				vec3 a3 = smoothstep( vec3( 0.0 ), d * 1.5, vCenter.xyz );
				return min( min( a3.x, a3.y ), a3.z );

			}

			void main() {

				gl_FragColor.rgb = mix( vec3( 1.0 ), vec3( 0.2 ), edgeFactorTri() );
				gl_FragColor.a = 1.0;
			}

		</script>

		<script>

			var camera, scene, renderer;
			var meshTris, meshLines, meshMixed;

			init();
			animate();

			function init() {

				camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 2000 );
				camera.position.z = 800;

				scene = new THREE.Scene();

				var size = 150;

				var geometryLines = new THREE.BoxGeometry( size, size, size );
				var geometryTris = new THREE.BoxGeometry( size, size, size );

				// wireframe using gl.LINES

				var materialLines = new THREE.MeshBasicMaterial( { wireframe: true } );

				meshLines = new THREE.Mesh( geometryLines, materialLines );
				meshLines.position.x = -150;
				scene.add( meshLines );

				//

				var vertexShader = document.getElementById( 'vertexShader' ).textContent;
				var fragmentShader = document.getElementById( 'fragmentShader' ).textContent;

				// wireframe using gl.TRIANGLES (interpreted as triangles)

				var attributesTris = { center: { type: 'v3', boundTo: 'faceVertices', value: [] } };
				var valuesTris = attributesTris.center.value;

				setupAttributes( geometryTris, valuesTris );

				var materialTris = new THREE.ShaderMaterial( { uniforms: {}, attributes: attributesTris, vertexShader: vertexShader, fragmentShader: fragmentShader } );

				meshTris = new THREE.Mesh( geometryTris, materialTris );
				meshTris.position.x = 150;
				scene.add( meshTris );

				// wireframe using gl.TRIANGLES (mixed triangles and quads)

				var mixedGeometry = new THREE.SphereGeometry( size / 2, 32, 16 );

				var attributesMixed = { center: { type: 'v3', boundTo: 'faceVertices', value: [] } };
				var valuesMixed = attributesMixed.center.value;

				setupAttributes( mixedGeometry, valuesMixed );

				var materialMixed = new THREE.ShaderMaterial( { uniforms: {}, attributes: attributesMixed, vertexShader: vertexShader, fragmentShader: fragmentShader } );

				meshMixed = new THREE.Mesh( mixedGeometry, materialMixed );
				meshMixed.position.x = -150;
				scene.add( meshMixed );


				// renderer

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

				// events

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

			}

			function setupAttributes( geometry, values ) {

				for( var f = 0; f < geometry.faces.length; f ++ ) {

					values[ f ] = [ new THREE.Vector3( 1, 0, 0 ), new THREE.Vector3( 0, 1, 0 ), new THREE.Vector3( 0, 0, 1 ) ];

				}

			}

			function onWindowResize() {

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

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

			}

			function animate() {

				requestAnimationFrame( animate );

				meshLines.rotation.x += 0.005;
				meshLines.rotation.y += 0.01;

				meshTris.rotation.x += 0.005;
				meshTris.rotation.y += 0.01;

				if ( meshMixed ) {

					meshMixed.rotation.x += 0.005;
					meshMixed.rotation.y += 0.01;

				}

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>