three 基础库
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import {
Group,
Mesh
} from '../../../build/three.module.js';
class SceneUtils {
static createMeshesFromInstancedMesh( instancedMesh ) {
const group = new Group();
const count = instancedMesh.count;
const geometry = instancedMesh.geometry;
const material = instancedMesh.material;
for ( let i = 0; i < count; i ++ ) {
const mesh = new Mesh( geometry, material );
instancedMesh.getMatrixAt( i, mesh.matrix );
mesh.matrix.decompose( mesh.position, mesh.quaternion, mesh.scale );
group.add( mesh );
}
group.copy( instancedMesh );
group.updateMatrixWorld(); // ensure correct world matrices of meshes
return group;
}
static createMultiMaterialObject( geometry, materials ) {
const group = new Group();
for ( let i = 0, l = materials.length; i < l; i ++ ) {
group.add( new Mesh( geometry, materials[ i ] ) );
}
return group;
}
static detach( child, parent, scene ) {
console.warn( 'THREE.SceneUtils: detach() has been deprecated. Use scene.attach( child ) instead.' );
scene.attach( child );
}
static attach( child, scene, parent ) {
console.warn( 'THREE.SceneUtils: attach() has been deprecated. Use parent.attach( child ) instead.' );
parent.attach( child );
}
}
export { SceneUtils };