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


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgpu - skinning individual instancing</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 webgpu - skinning instancing individual">
		<meta property="og:type" content="website">
		<meta property="og:url" content="https://threejs.org/examples/webgpu_skinning_instancing_individual.html">
		<meta property="og:image" content="https://threejs.org/examples/screenshots/webgpu_skinning_instancing_individual.jpg">
		<link type="text/css" rel="stylesheet" href="example.css">
	</head>
	<body>

		<div id="info">
			<a href="https://threejs.org/" target="_blank" rel="noopener" class="logo-link"></a>

			<div class="title-wrapper">
				<a href="https://threejs.org/" target="_blank" rel="noopener">three.js</a><span>Skinning Individual Instancing</span>
			</div>

			<small>
				Per-instance poses are computed once and reused by every render pass.
			</small>
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.webgpu.js",
					"three/webgpu": "../build/three.webgpu.js",
					"three/tsl": "../build/three.tsl.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three/webgpu';
			import { Fn, add, attributeArray, color, instanceIndex, screenUV, storage, transformNormal, transformNormalToView, uint, uniform, vec4, vertexIndex } from 'three/tsl';

			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import { RoomEnvironment } from 'three/addons/environments/RoomEnvironment.js';
			import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
			import { Inspector } from 'three/addons/inspector/Inspector.js';

			import WebGPU from 'three/addons/capabilities/WebGPU.js';

			let camera, scene, renderer, controls;
			let mixer, timer, animatedObject, proportionBones, referenceMesh, footBones, groundFoot, dummy;
			let instanceMatrices, instanceMatricesNode, bellyWeightsNode;
			let computeSkinning;

			const skeletonStates = new Map();
			const timeOffsets = [];
			const variations = [];
			const leftFoot = new THREE.Vector3();
			const rightFoot = new THREE.Vector3();

			init();

			function createSourceVertexAttribute( geometry ) {

				const position = geometry.getAttribute( 'position' );
				const normal = geometry.getAttribute( 'normal' );
				const bellyPosition = position.clone();
				const data = new Float32Array( position.count * 12 );

				for ( let i = 0; i < position.count; i ++ ) {

					const amount = Math.max( 0, 1 - Math.abs( position.getY( i ) - 0.94 ) / 0.3 ) * 0.8;

					bellyPosition.setXYZ(
						i,
						position.getX( i ) * amount,
						0,
						position.getZ( i ) * amount
					);

					const offset = i * 12;

					data[ offset + 0 ] = position.getX( i );
					data[ offset + 1 ] = position.getY( i );
					data[ offset + 2 ] = position.getZ( i );
					data[ offset + 4 ] = normal.getX( i );
					data[ offset + 5 ] = normal.getY( i );
					data[ offset + 6 ] = normal.getZ( i );
					data[ offset + 8 ] = bellyPosition.getX( i );
					data[ offset + 9 ] = bellyPosition.getY( i );
					data[ offset + 10 ] = bellyPosition.getZ( i );

				}

				return new THREE.StorageBufferAttribute( data, 4 );

			}

			function getSkeletonState( skeleton, instanceCount ) {

				let state = skeletonStates.get( skeleton );

				if ( state === undefined ) {

					const boneCount = skeleton.bones.length;
					const boneMatrices = new THREE.StorageBufferAttribute( instanceCount * boneCount, 16 );

					state = {
						skeleton,
						boneCount,
						boneMatrices,
						boneMatricesNode: storage( boneMatrices, 'mat4', boneMatrices.count ).toReadOnly()
					};

					skeletonStates.set( skeleton, state );

				}

				return state;

			}

			function createComputedMesh( source, instanceCount ) {

				const geometry = source.geometry.clone();
				const material = source.material.clone();
				const vertexCount = geometry.getAttribute( 'position' ).count;
				const skeletonState = getSkeletonState( source.skeleton, instanceCount );

				const sourceVertices = storage( createSourceVertexAttribute( geometry ), 'vec4', vertexCount * 3 ).toReadOnly();
				const skinIndices = storage( new THREE.StorageBufferAttribute( new Uint32Array( geometry.getAttribute( 'skinIndex' ).array ), 4 ), 'uvec4', vertexCount ).toReadOnly();
				const skinWeights = storage( new THREE.StorageBufferAttribute( geometry.getAttribute( 'skinWeight' ).array, 4 ), 'vec4', vertexCount ).toReadOnly();
				const bindMatrix = uniform( source.bindMatrix, 'mat4' );
				const bindMatrixInverse = uniform( source.bindMatrixInverse, 'mat4' );
				const vertices = attributeArray( instanceCount * vertexCount * 2, 'vec4' );

				computeSkinning = Fn( () => {

					const sourceVertex = instanceIndex.mod( uint( vertexCount ) );
					const meshInstance = instanceIndex.div( uint( vertexCount ) );
					const sourceOffset = sourceVertex.mul( uint( 3 ) );
					const targetOffset = instanceIndex.mul( uint( 2 ) );
					const boneOffset = meshInstance.mul( uint( skeletonState.boneCount ) );
					const skinIndex = skinIndices.element( sourceVertex );
					const skinWeight = skinWeights.element( sourceVertex );
					const morphPosition = sourceVertices.element( sourceOffset ).xyz.add( sourceVertices.element( sourceOffset.add( uint( 2 ) ) ).xyz.mul( bellyWeightsNode.element( meshInstance ) ) );
					const skinVertex = bindMatrix.mul( morphPosition );
					const boneMatX = skeletonState.boneMatricesNode.element( boneOffset.add( skinIndex.x ) );
					const boneMatY = skeletonState.boneMatricesNode.element( boneOffset.add( skinIndex.y ) );
					const boneMatZ = skeletonState.boneMatricesNode.element( boneOffset.add( skinIndex.z ) );
					const boneMatW = skeletonState.boneMatricesNode.element( boneOffset.add( skinIndex.w ) );
					const skinMatrix = add(
						skinWeight.x.mul( boneMatX ),
						skinWeight.y.mul( boneMatY ),
						skinWeight.z.mul( boneMatZ ),
						skinWeight.w.mul( boneMatW )
					);
					const skinPosition = bindMatrixInverse.mul( add(
						boneMatX.mul( skinWeight.x ).mul( skinVertex ),
						boneMatY.mul( skinWeight.y ).mul( skinVertex ),
						boneMatZ.mul( skinWeight.z ).mul( skinVertex ),
						boneMatW.mul( skinWeight.w ).mul( skinVertex )
					) ).xyz;
					const skinNormal = bindMatrixInverse.mul( skinMatrix ).mul( bindMatrix ).transformDirection( sourceVertices.element( sourceOffset.add( uint( 1 ) ) ).xyz ).xyz;
					const instanceMatrix = instanceMatricesNode.element( meshInstance );

					vertices.element( targetOffset ).assign( vec4( instanceMatrix.mul( skinPosition ).xyz, 1 ) );
					vertices.element( targetOffset.add( uint( 1 ) ) ).assign( vec4( transformNormal( skinNormal, instanceMatrix ), 0 ) );

				} )().compute( instanceCount * vertexCount ).setName( 'Compute Instanced Skinning' );

				const meshVertex = instanceIndex.mul( uint( vertexCount ) ).add( vertexIndex ).mul( uint( 2 ) );

				material.positionNode = vertices.element( meshVertex ).xyz;
				material.normalNode = transformNormalToView( vertices.element( meshVertex.add( uint( 1 ) ) ).xyz ).toVarying();

				const mesh = new THREE.Mesh( geometry, material );
				mesh.count = instanceCount;
				mesh.castShadow = true;
				mesh.frustumCulled = false;

				source.parent.add( mesh );
				source.visible = false;

			}

			async function init() {

				if ( WebGPU.isAvailable() === false ) {

					document.body.appendChild( WebGPU.getErrorMessage() );

					throw new Error( 'No WebGPU support' );

				}

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.01, 60 );
				camera.position.set( 4.6, 3.3, 6.2 );

				scene = new THREE.Scene();
				scene.backgroundNode = screenUV.y.mix( color( 0x8f989c ), color( 0xe7eaeb ) );

				timer = new THREE.Timer();
				timer.connect( document );

				scene.add( new THREE.HemisphereLight( 0xffffff, 0x939b9e, 1.2 ) );

				const directionalLight = new THREE.DirectionalLight( 0xfffbf4, 2.8 );
				directionalLight.position.set( - 4, 10, 8 );
				directionalLight.castShadow = true;
				directionalLight.shadow.mapSize.set( 2048, 2048 );
				directionalLight.shadow.camera.left = - 5;
				directionalLight.shadow.camera.right = 5;
				directionalLight.shadow.camera.top = 5;
				directionalLight.shadow.camera.bottom = - 5;
				directionalLight.shadow.camera.near = 0.1;
				directionalLight.shadow.camera.far = 30;
				directionalLight.shadow.camera.updateProjectionMatrix();
				scene.add( directionalLight );

				const rimLight = new THREE.DirectionalLight( 0xe8f4ff, 0.85 );
				rimLight.position.set( 7, 5, - 5 );
				scene.add( rimLight );

				const ground = new THREE.Mesh(
					new THREE.PlaneGeometry( 400, 400 ),
					new THREE.ShadowMaterial( { color: 0x5d6568, opacity: 0.3 } )
				);

				ground.rotation.x = - Math.PI / 2;
				ground.receiveShadow = true;
				scene.add( ground );

				new GLTFLoader().load( 'models/gltf/Michelle.glb', function ( gltf ) {

					const object = gltf.scene;
					const instanceCount = 30;
					const duration = gltf.animations[ 0 ].duration;
					const skinnedMeshes = [];

					dummy = new THREE.Object3D();
					animatedObject = object;
					mixer = new THREE.AnimationMixer( object );
					mixer.clipAction( gltf.animations[ 0 ] ).play();

					object.traverse( ( child ) => {

						if ( child.isSkinnedMesh === true ) skinnedMeshes.push( child );

					} );

					referenceMesh = skinnedMeshes[ 0 ];
					const skeleton = referenceMesh.skeleton;
					const getBone = ( name ) => skeleton.bones.find( ( bone ) => bone.name.endsWith( name ) );
					const proportionTargets = [
						getBone( 'Head' ), getBone( 'Spine' ), getBone( 'Spine2' ),
						getBone( 'LeftArm' ), getBone( 'RightArm' ),
						getBone( 'LeftForeArm' ), getBone( 'RightForeArm' ),
						getBone( 'LeftUpLeg' ), getBone( 'RightUpLeg' ),
						getBone( 'LeftLeg' ), getBone( 'RightLeg' )
					];

					proportionBones = {
						head: proportionTargets[ 0 ],
						belly: proportionTargets[ 1 ],
						chest: proportionTargets[ 2 ],
						arms: proportionTargets.slice( 3, 7 ),
						legs: proportionTargets.slice( 7 ),
						baseScales: proportionTargets.map( ( bone ) => bone.scale.clone() )
					};
					footBones = [ getBone( 'LeftFoot' ), getBone( 'RightFoot' ) ];

					const bodyTypes = [
						{ width: 0.92, height: 1.09, depth: 0.92, belly: 0, headScale: 0.96, bellyWidth: 0.98, chestWidth: 0.98, armLength: 1.03, legLength: 1.04 },
						{ width: 1.0, height: 1.05, depth: 0.99, belly: 0, headScale: 0.98, bellyWidth: 1.0, chestWidth: 1.03, armLength: 1.02, legLength: 1.02 },
						{ width: 1.0, height: 1.0, depth: 1.0, belly: 0, headScale: 1.0, bellyWidth: 1.0, chestWidth: 1.0, armLength: 1.0, legLength: 1.0 },
						{ width: 1.08, height: 0.9, depth: 1.1, belly: 0.75, headScale: 1.06, bellyWidth: 1.12, chestWidth: 1.0, armLength: 0.9, legLength: 0.9 },
						{ width: 1.2, height: 0.8, depth: 1.22, belly: 1.6, headScale: 1.12, bellyWidth: 1.24, chestWidth: 1.04, armLength: 0.72, legLength: 0.7 }
					];

					const bellyWeights = new THREE.StorageBufferAttribute( instanceCount, 1 );
					instanceMatrices = new THREE.StorageBufferAttribute( instanceCount, 16 );
					bellyWeightsNode = storage( bellyWeights, 'float', instanceCount ).toReadOnly();
					instanceMatricesNode = storage( instanceMatrices, 'mat4', instanceCount ).toReadOnly();

					for ( let i = 0; i < instanceCount; i ++ ) {

						const bodyType = bodyTypes[ i % bodyTypes.length ];
						const isChild = i % 2 === 0;
						const size = isChild ? ( i % 4 === 0 ? 0.68 : 0.78 ) : 1;
						const innerRing = i < 10;
						const ringIndex = innerRing ? i : i - 10;
						const ringCount = innerRing ? 10 : 20;
						const angle = ringIndex / ringCount * Math.PI * 2;
						const radius = innerRing ? 175 : 340;

						timeOffsets.push( duration * i / instanceCount );
						variations.push( {
							... bodyType,
							size,
							x: Math.sin( angle ) * radius,
							y: Math.cos( angle ) * radius
						} );
						bellyWeights.array[ i ] = bodyType.belly;

					}

					bellyWeights.needsUpdate = true;
					animatedObject.updateMatrixWorld( true );
					skeleton.update();
					groundFoot = getFootCoordinate();

					for ( const child of skinnedMeshes ) createComputedMesh( child, instanceCount );

					scene.add( object );

				} );

				renderer = new THREE.WebGPURenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				renderer.shadowMap.enabled = true;
				renderer.shadowMap.type = THREE.PCFSoftShadowMap;
				renderer.toneMapping = THREE.NeutralToneMapping;
				renderer.toneMappingExposure = 0.96;
				renderer.inspector = new Inspector();
				document.body.appendChild( renderer.domElement );
				await renderer.init();
				scene.environment = new THREE.PMREMGenerator( renderer ).fromScene( new RoomEnvironment(), 0.04 ).texture;

				controls = new OrbitControls( camera, renderer.domElement );
				controls.target.set( 0, 0.75, 0 );
				controls.enableDamping = true;
				controls.minDistance = 3;
				controls.maxDistance = 25;
				controls.maxPolarAngle = Math.PI / 2;
				controls.update();

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

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

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

			}

			function applyProportions( variation ) {

				const { head, belly, chest, arms, legs, baseScales } = proportionBones;
				const bones = [ head, belly, chest, ... arms, ... legs ];

				for ( let i = 0; i < bones.length; i ++ ) bones[ i ].scale.copy( baseScales[ i ] );

				head.scale.multiplyScalar( variation.headScale );
				belly.scale.x *= variation.bellyWidth;
				belly.scale.z *= variation.bellyWidth;
				chest.scale.x *= variation.chestWidth;
				chest.scale.z *= variation.chestWidth;

				for ( const bone of arms ) bone.scale.y *= variation.armLength;
				for ( const bone of legs ) bone.scale.y *= variation.legLength;

			}

			function getFootCoordinate() {

				footBones[ 0 ].getWorldPosition( leftFoot );
				footBones[ 1 ].getWorldPosition( rightFoot );
				referenceMesh.worldToLocal( leftFoot );
				referenceMesh.worldToLocal( rightFoot );

				return Math.max( leftFoot.z, rightFoot.z );

			}

			function updateInstanceMatrix( index, variation ) {

				const foot = getFootCoordinate();

				dummy.position.set( variation.x, variation.y, groundFoot - foot * variation.height * variation.size );
				dummy.scale.set( variation.width, variation.depth, variation.height ).multiplyScalar( variation.size );
				dummy.updateMatrix();
				dummy.matrix.toArray( instanceMatrices.array, index * 16 );

			}

			function animate() {

				timer.update();
				controls.update();

				if ( mixer ) {

					const elapsed = timer.getElapsed();

					for ( let i = 0; i < timeOffsets.length; i ++ ) {

						mixer.setTime( elapsed + timeOffsets[ i ] );
						applyProportions( variations[ i ] );
						animatedObject.updateMatrixWorld( true );

						for ( const state of skeletonStates.values() ) {

							state.skeleton.update();
							state.boneMatrices.array.set( state.skeleton.boneMatrices, i * state.boneCount * 16 );

						}

						updateInstanceMatrix( i, variations[ i ] );

					}

					for ( const state of skeletonStates.values() ) state.boneMatrices.needsUpdate = true;
					instanceMatrices.needsUpdate = true;
					renderer.compute( computeSkinning );

				}

				renderer.render( scene, camera );

			}

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