examples/webgl_materials_modified.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - materials - modified</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:#000;
				color:#fff;
				padding:0;
				margin:0;
				font-weight: bold;
				overflow:hidden;
			}

			a { color: #ffffff; }

			#info {
				position: absolute;
				top: 0px; width: 100%;
				color: #ffffff;
				padding: 5px;
				font-family:Monospace;
				font-size:13px;
				text-align:center;
				z-index:1000;
			}

			#webglmessage {
				background:rgb(200,100,0) !important;
				color:#fff;
			}

		</style>
	</head>

	<body>
		<div id="info">
			<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> wegbl - modified material.
			<a href="http://graphics.cs.williams.edu/data/meshes.xml#14" target="_blank" rel="noopener">Lee Perry-Smith</a> head.
		</div>

		<script src="../build/three.js"></script>
		<script src="js/controls/OrbitControls.js"></script>
		<script src="js/loaders/GLTFLoader.js"></script>

		<script src="js/WebGL.js"></script>
		<script src="js/libs/stats.min.js"></script>

		<script>

			if ( WEBGL.isWebGLAvailable() === false ) {

				document.body.appendChild( WEBGL.getWebGLErrorMessage() );

			}

			var camera, scene, renderer, stats;

			var materialShader;

			init();
			animate();

			function init() {

				camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 10000 );
				camera.position.z = 1500;

				scene = new THREE.Scene();

				var material = new THREE.MeshNormalMaterial();
				material.onBeforeCompile = function ( shader ) {

					shader.uniforms.time = { value: 0 };

					shader.vertexShader = 'uniform float time;\n' + shader.vertexShader;
					shader.vertexShader = shader.vertexShader.replace(
						'#include <begin_vertex>',
						[
							'float theta = sin( time + position.y ) / 2.0;',
							'float c = cos( theta );',
							'float s = sin( theta );',
							'mat3 m = mat3( c, 0, s, 0, 1, 0, -s, 0, c );',
							'vec3 transformed = vec3( position ) * m;',
							'vNormal = vNormal * m;'
						].join( '\n' )
					);

					materialShader = shader;

				};

				var loader = new THREE.GLTFLoader();
				loader.load( 'models/gltf/LeePerrySmith/LeePerrySmith.glb', function ( gltf ) {

					var mesh = new THREE.Mesh( gltf.scene.children[ 0 ].geometry, material );
					mesh.position.y = - 50;
					mesh.scale.setScalar( 100 );
					scene.add( mesh );

				} );

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

				var controls = new THREE.OrbitControls( camera, renderer.domElement );

				//

				stats = new Stats();
				document.body.appendChild( stats.dom );

				// EVENTS

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

			}

			//

			function onWindowResize() {

				var width = window.innerWidth;
				var height = window.innerHeight;

				camera.aspect = width / height;
				camera.updateProjectionMatrix();

				renderer.setSize( width, height );

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();

				stats.update();

			}

			function render() {

				if ( materialShader ) {

					materialShader.uniforms.time.value = performance.now() / 1000;

				}

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>