three.js SkinnedMesh

2023-02-16 17:47 更新

具有Skeleton（骨架）和bones（骨骼）的网格，可用于给几何体上的顶点添加动画。

SkinnedMesh 只能与 WebGL 2 一起使用。对于 WebGL 1，需要 OES_texture_float 和顶点纹理支持。

代码示例

const geometry = new THREE.CylinderGeometry( 5, 5, 5, 5, 15, 5, 30 );

// create the skin indices and skin weights

const position = geometry.attributes.position;

const vertex = new THREE.Vector3();

const skinIndices = [];
const skinWeights = [];

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

	vertex.fromBufferAttribute( position, i );

	// compute skinIndex and skinWeight based on some configuration data

	const y = ( vertex.y + sizing.halfHeight );

	const skinIndex = Math.floor( y / sizing.segmentHeight );
	const skinWeight = ( y % sizing.segmentHeight ) / sizing.segmentHeight;

	skinIndices.push( skinIndex, skinIndex + 1, 0, 0 );
	skinWeights.push( 1 - skinWeight, skinWeight, 0, 0 );

}

geometry.setAttribute( 'skinIndex', new THREE.Uint16BufferAttribute( skinIndices, 4 ) );
geometry.setAttribute( 'skinWeight', new THREE.Float32BufferAttribute( skinWeights, 4 ) );

// create skinned mesh and skeleton

const mesh = new THREE.SkinnedMesh( geometry, material );
const skeleton = new THREE.Skeleton( bones );

// see example from THREE.Skeleton

const rootBone = skeleton.bones[ 0 ];
mesh.add( rootBone );

// bind the skeleton to the mesh

mesh.bind( skeleton );

// move the bones and manipulate the model

skeleton.bones[ 0 ].rotation.x = -0.1;
skeleton.bones[ 1 ].rotation.x = 0.2;