samien
/
three.js
Mirror von https://github.com/mrdoob/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - IFCLoader</title>
		<meta charset="utf-8" />
		<meta
			name="viewport"
			content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0"
		/>
		<meta property="og:title" content="three.js webgl - IFCLoader" />
		<meta property="og:type" content="website" />
		<meta property="og:url" content="https://threejs.org/examples/webgl_loader_ifc.html" />
		<meta property="og:image" content="https://threejs.org/examples/screenshots/webgl_loader_ifc.jpg" />
		<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>
			-
			IFC loader using
			<a href="https://github.com/ThatOpen/engine_web-ifc" target="_blank" rel="noopener">web-ifc</a>.
			See <a href="https://github.com/ThatOpen" target="_blank" rel="noopener">main project repository</a> for more information and BIM tools.
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/",
					"web-ifc": "https://cdn.jsdelivr.net/npm/web-ifc@0.0.77/web-ifc-api.js"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';
			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';

			import { IfcAPI } from 'web-ifc';

			const WEB_IFC_VERSION = '0.0.77';
			const WEB_IFC_WASM_PATH = `https://cdn.jsdelivr.net/npm/web-ifc@${ WEB_IFC_VERSION }/`;

			let scene, camera, renderer;

			init();

			async function init() {

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x8cc7de );

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.1, 1000 );
				camera.position.set( 82.48, 22.09, - 45.24 );

				const directionalLight1 = new THREE.DirectionalLight( 0xffeeff, 2.5 );
				directionalLight1.position.set( 1, 1, 1 );
				scene.add( directionalLight1 );

				const directionalLight2 = new THREE.DirectionalLight( 0xffffff, 2.5 );
				directionalLight2.position.set( - 1, 0.5, - 1 );
				scene.add( directionalLight2 );

				const ambientLight = new THREE.AmbientLight( 0xffffee, 0.75 );
				scene.add( ambientLight );

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

				const controls = new OrbitControls( camera, renderer.domElement );
				controls.target.set( 30.86, 7.73, 0.15 );
				controls.update();
				controls.addEventListener( 'change', render );

				window.addEventListener( 'resize', onWindowResize );

				const ifcAPI = new IfcAPI();
				ifcAPI.SetWasmPath( WEB_IFC_WASM_PATH );
				await ifcAPI.Init();

				const response = await fetch( 'models/ifc/rac_advanced_sample_project.ifc' );
				const data = new Uint8Array( await response.arrayBuffer() );

				const modelID = ifcAPI.OpenModel( data, { COORDINATE_TO_ORIGIN: true } );
				loadAllGeometry( ifcAPI, modelID );
				ifcAPI.CloseModel( modelID );

				render();

			}

			function loadAllGeometry( ifcAPI, modelID ) {

				const opaqueGeometries = [];
				const transparentGeometries = [];
				const materialCache = {};

				ifcAPI.StreamAllMeshes( modelID, ( flatMesh ) => {

					const placedGeometries = flatMesh.geometries;

					for ( let i = 0; i < placedGeometries.size(); i ++ ) {

						const placedGeometry = placedGeometries.get( i );
						const mesh = getPlacedGeometry( ifcAPI, modelID, placedGeometry, materialCache );
						const geometry = mesh.geometry.applyMatrix4( mesh.matrix );

						if ( placedGeometry.color.w !== 1 ) {

							transparentGeometries.push( geometry );

						} else {

							opaqueGeometries.push( geometry );

						}

					}

				} );

				if ( opaqueGeometries.length > 0 ) {

					const merged = BufferGeometryUtils.mergeGeometries( opaqueGeometries );
					const material = new THREE.MeshPhongMaterial( { side: THREE.DoubleSide, vertexColors: true } );
					scene.add( new THREE.Mesh( merged, material ) );

				}

				if ( transparentGeometries.length > 0 ) {

					const merged = BufferGeometryUtils.mergeGeometries( transparentGeometries );
					const material = new THREE.MeshPhongMaterial( {
						side: THREE.DoubleSide,
						vertexColors: true,
						transparent: true,
					} );
					scene.add( new THREE.Mesh( merged, material ) );

				}

			}

			function getPlacedGeometry( ifcAPI, modelID, placedGeometry, materialCache ) {

				const geometry = getBufferGeometry( ifcAPI, modelID, placedGeometry );
				const material = getMeshMaterial( placedGeometry.color, materialCache );
				const mesh = new THREE.Mesh( geometry, material );
				mesh.matrix = new THREE.Matrix4().fromArray( placedGeometry.flatTransformation );
				mesh.matrixAutoUpdate = false;
				return mesh;

			}

			function getBufferGeometry( ifcAPI, modelID, placedGeometry ) {

				const geometry = ifcAPI.GetGeometry( modelID, placedGeometry.geometryExpressID );
				const vertexData = ifcAPI.GetVertexArray( geometry.GetVertexData(), geometry.GetVertexDataSize() );
				const indexData = ifcAPI.GetIndexArray( geometry.GetIndexData(), geometry.GetIndexDataSize() );

				const bufferGeometry = ifcGeometryToBuffer( placedGeometry.color, vertexData, indexData );

				// Geometry is owned by the WASM heap and must be released.
				geometry.delete();
				return bufferGeometry;

			}

			function getMeshMaterial( color, materialCache ) {

				const id = `${ color.x }-${ color.y }-${ color.z }-${ color.w }`;
				const cached = materialCache[ id ];
				if ( cached ) return cached;

				const material = new THREE.MeshPhongMaterial( {
					color: new THREE.Color( color.x, color.y, color.z ),
					side: THREE.DoubleSide,
				} );

				if ( color.w !== 1 ) {

					material.transparent = true;
					material.opacity = color.w;

				}

				materialCache[ id ] = material;
				return material;

			}

			const _tmpColor = new THREE.Color();

			function ifcGeometryToBuffer( color, vertexData, indexData ) {

				// web-ifc returns interleaved [px, py, pz, nx, ny, nz] per vertex.
				const vertexCount = vertexData.length / 6;
				const positions = new Float32Array( vertexCount * 3 );
				const normals = new Float32Array( vertexCount * 3 );
				const colors = new Float32Array( vertexCount * 4 );

				// IFC stores colors in sRGB display space; convert to linear once per geometry.
				_tmpColor.setRGB( color.x, color.y, color.z, THREE.SRGBColorSpace );

				for ( let v = 0; v < vertexCount; v ++ ) {

					const src = v * 6;
					const dst3 = v * 3;
					const dst4 = v * 4;

					positions[ dst3 + 0 ] = vertexData[ src + 0 ];
					positions[ dst3 + 1 ] = vertexData[ src + 1 ];
					positions[ dst3 + 2 ] = vertexData[ src + 2 ];

					normals[ dst3 + 0 ] = vertexData[ src + 3 ];
					normals[ dst3 + 1 ] = vertexData[ src + 4 ];
					normals[ dst3 + 2 ] = vertexData[ src + 5 ];

					colors[ dst4 + 0 ] = _tmpColor.r;
					colors[ dst4 + 1 ] = _tmpColor.g;
					colors[ dst4 + 2 ] = _tmpColor.b;
					colors[ dst4 + 3 ] = color.w;

				}

				const geometry = new THREE.BufferGeometry();
				geometry.setAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
				geometry.setAttribute( 'normal', new THREE.BufferAttribute( normals, 3 ) );
				geometry.setAttribute( 'color', new THREE.BufferAttribute( colors, 4 ) );
				geometry.setIndex( new THREE.BufferAttribute( indexData, 1 ) );
				return geometry;

			}

			function onWindowResize() {

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

			}

			function render() {

				renderer.render( scene, camera );

			}

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