samien
/
three.js
огледало от https://github.com/mrdoob/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - VolumeMesh</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">
	</head>
	<body>

		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - VolumeMesh<br/>
			Generation time: <span id="output">-</span>
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/",
					"three-mesh-bvh": "https://cdn.jsdelivr.net/npm/three-mesh-bvh@0.7.8/build/index.module.js"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';
			import { FullScreenQuad } from 'three/addons/postprocessing/Pass.js';
			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import { RoomEnvironment } from 'three/addons/environments/RoomEnvironment.js';
			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
			import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
			import * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';
			import { computeBoundsTree, disposeBoundsTree, acceleratedRaycast } from 'three-mesh-bvh';
			import { VolumeMesh } from 'three/addons/utils/VolumeMesh.js';
			import { RenderSDFLayerMaterial } from 'three/addons/utils/RenderSDFLayerMaterial.js';


			// Add BVH extension to THREE.BufferGeometry
			THREE.BufferGeometry.prototype.computeBoundsTree = computeBoundsTree;
			THREE.BufferGeometry.prototype.disposeBoundsTree = disposeBoundsTree;
			THREE.Mesh.prototype.raycast = acceleratedRaycast;

			const params = {
				resolution: 100,
				margin: 0.05,
				surface: 0.0,
				regenerate: () => regenerateVolume(),
				showMultiple: false,
				showLayers: true,
				layer: 0
			};

			let renderer, camera, scene, gui;
			let outputContainer;
			let sourceMesh, sourceMaterial;
			let volumeMeshes = [];
			let layerPass;

			init();

			async function init() {

				outputContainer = document.getElementById( 'output' );

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

				// scene setup
				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x111111 );

				// Setup environment map
				const pmremGenerator = new THREE.PMREMGenerator( renderer );
				const environment = new RoomEnvironment();
				const envMapRT = pmremGenerator.fromScene( environment );
				scene.environment = envMapRT.texture;
				environment.dispose();
				pmremGenerator.dispose();

				// camera setup
				camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 50 );
				camera.position.set( 1, 1, 2 );
				camera.far = 100;
				camera.updateProjectionMatrix();

				new OrbitControls( camera, renderer.domElement );

				// screen pass to render a single layer of the 3d texture
				layerPass = new FullScreenQuad( new RenderSDFLayerMaterial() );

				// Load model
				new GLTFLoader()
					.load( 'models/gltf/DamagedHelmet/glTF/DamagedHelmet.gltf', async ( gltf ) => {

						const object = gltf.scene;
						object.updateMatrixWorld( true );

						// Get material from first mesh
						object.traverse( c => {

							if ( c.isMesh && c.material && ! sourceMaterial ) {

								sourceMaterial = c.material;

							}

						} );

						// Merge into single geometry
						const geometries = [];
						object.traverse( c => {

							if ( c.geometry ) {

								const cloned = c.geometry.clone();
								cloned.applyMatrix4( c.matrixWorld );
								geometries.push( cloned );

							}

						} );

						const mergedGeometry = BufferGeometryUtils.mergeGeometries( geometries );
						mergedGeometry.center();

						// Compute BVH (required for VolumeMesh)
						mergedGeometry.computeBoundsTree( { maxLeafTris: 1 } );

						sourceMesh = new THREE.Mesh( mergedGeometry, sourceMaterial );

						// Generate the first volume mesh
						await regenerateVolume();

					} );

				// GUI
				gui = new GUI();
				gui.add( params, 'resolution', 32, 200, 1 ).name( 'Resolution' );
				gui.add( params, 'margin', 0, 0.5 ).name( 'Margin' );
				gui.add( params, 'surface', - 0.2, 0.5 ).name( 'Surface' ).onChange( () => {

					volumeMeshes.forEach( v => v.surface = params.surface );

				} );
				gui.add( params, 'regenerate' ).name( 'Regenerate' );
				gui.add( params, 'showMultiple' ).name( 'Show Multiple' ).onChange( ( value ) => {

					if ( value ) {

						createMultipleVolumes();

					} else {

						removeExtraVolumes();

					}

				} );
				gui.add( params, 'showLayers' );
				gui.add( params, 'layer', 0, params.resolution - 1, 1 );

				window.addEventListener( 'resize', onResize );

			}

			async function regenerateVolume() {

				if ( ! sourceMesh ) return;

				const startTime = window.performance.now();

				// Remove existing volume meshes
				volumeMeshes.forEach( v => {

					scene.remove( v );
					v.dispose();

				} );
				volumeMeshes = [];

				// Create new VolumeMesh - this is all you need!
				const volume = new VolumeMesh( {
					resolution: params.resolution,
					margin: params.margin,
					surface: params.surface,
					roughness: 1.0,
					metalness: 1.0
				} );

				// Generate the SDF from the source mesh
				await volume.generate( sourceMesh );

				// Add to scene
				scene.add( volume );
				volumeMeshes.push( volume );

				const delta = window.performance.now() - startTime;
				outputContainer.innerText = `${ delta.toFixed( 2 ) }ms`;
				console.log( `VolumeMesh generated in ${delta.toFixed( 2 )}ms` );

				// If showing multiple, create them
				if ( params.showMultiple ) {

					createMultipleVolumes();

				}

			}

			async function createMultipleVolumes() {

				if ( volumeMeshes.length === 0 || ! sourceMesh ) return;

				// Position the first one
				volumeMeshes[ 0 ].position.x = - 1.5;

				// Create 2 more volumes
				for ( let i = 1; i < 3; i ++ ) {

					const volume = new VolumeMesh( {
						resolution: params.resolution,
						margin: params.margin,
						surface: params.surface,
						roughness: 1.0,
						metalness: 1.0
					} );

					// Reuse the SDF texture from the first volume
					volume.sdfTexture = volumeMeshes[ 0 ].sdfTexture;
					volume.inverseBoundsMatrix.copy( volumeMeshes[ 0 ].inverseBoundsMatrix );

					// Copy material properties
					if ( sourceMesh.material ) {

						const mat = sourceMesh.material;
						if ( mat.map ) volume.material.map = mat.map;
						if ( mat.normalMap ) volume.material.normalMap = mat.normalMap;
						if ( mat.metalnessMap ) volume.material.metalnessMap = mat.metalnessMap;
						if ( mat.roughnessMap ) volume.material.roughnessMap = mat.roughnessMap;
						if ( mat.aoMap ) volume.material.aoMap = mat.aoMap;
						volume.material.needsUpdate = true;

					}

					// Set scale and position
					const sdfBoundsMatrix = volume.inverseBoundsMatrix.clone().invert();
					const boundsCenter = new THREE.Vector3();
					const boundsQuat = new THREE.Quaternion();
					const boundsScale = new THREE.Vector3();
					sdfBoundsMatrix.decompose( boundsCenter, boundsQuat, boundsScale );

					volume.scale.copy( boundsScale );
					volume.position.copy( boundsCenter );
					volume.position.x = i * 1.5;
					volume.updateMatrixWorld();

					scene.add( volume );
					volumeMeshes.push( volume );

				}

			}

			function removeExtraVolumes() {

				// Keep only the first volume
				while ( volumeMeshes.length > 1 ) {

					const v = volumeMeshes.pop();
					scene.remove( v );
					// Don't dispose the shared texture, only dispose materials
					v.geometry.dispose();
					v.material.dispose();

				}

				// Reset position of the first one
				if ( volumeMeshes.length > 0 ) {

					const sdfBoundsMatrix = volumeMeshes[ 0 ].inverseBoundsMatrix.clone().invert();
					const boundsCenter = new THREE.Vector3();
					const boundsQuat = new THREE.Quaternion();
					const boundsScale = new THREE.Vector3();
					sdfBoundsMatrix.decompose( boundsCenter, boundsQuat, boundsScale );

					volumeMeshes[ 0 ].position.copy( boundsCenter );
					volumeMeshes[ 0 ].updateMatrixWorld();

				}

			}

			function onResize() {

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

			}

			function render() {

				renderer.render( scene, camera );

				if ( params.showLayers && volumeMeshes.length > 0 ) {

					const layerSize = 256;
					renderer.setScissorTest( true );
					renderer.setScissor( 0, window.innerHeight - layerSize, layerSize, layerSize );
					renderer.setViewport( 0, window.innerHeight - layerSize, layerSize, layerSize );

					layerPass.material.uniforms.sdfTex.value = volumeMeshes[ 0 ].sdfTexture;
					layerPass.material.uniforms.layer.value = params.layer * ( 1 / params.resolution );

					layerPass.render( renderer );

					renderer.setScissorTest( false );
					renderer.setViewport( 0, 0, window.innerWidth, window.innerHeight );

				}

			}

		</script>

	</body>
</html>