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- import {
- Box3,
- Float32BufferAttribute,
- InstancedBufferGeometry,
- InstancedBufferAttribute,
- Sphere,
- Vector3
- } from 'three';
- const _vector = new Vector3();
- class InstancedPointsGeometry extends InstancedBufferGeometry {
- constructor() {
- super();
- this.isInstancedPointsGeometry = true;
- this.type = 'InstancedPointsGeometry';
- const positions = [ - 1, 1, 0, 1, 1, 0, - 1, - 1, 0, 1, - 1, 0 ];
- const uvs = [ 0, 1, 1, 1, 0, 0, 1, 0 ];
- const index = [ 0, 2, 1, 2, 3, 1 ];
- this.setIndex( index );
- this.setAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );
- this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );
- }
- applyMatrix4( matrix ) {
- const pos = this.attributes.instancePosition;
- if ( pos !== undefined ) {
- pos.applyMatrix4( matrix );
- pos.needsUpdate = true;
- }
- if ( this.boundingBox !== null ) {
- this.computeBoundingBox();
- }
- if ( this.boundingSphere !== null ) {
- this.computeBoundingSphere();
- }
- return this;
- }
- setPositions( array ) {
- let points;
- if ( array instanceof Float32Array ) {
- points = array;
- } else if ( Array.isArray( array ) ) {
- points = new Float32Array( array );
- }
- this.setAttribute( 'instancePosition', new InstancedBufferAttribute( points, 3 ) ); // xyz
- //
- this.computeBoundingBox();
- this.computeBoundingSphere();
- return this;
- }
- setColors( array ) {
- let colors;
- if ( array instanceof Float32Array ) {
- colors = array;
- } else if ( Array.isArray( array ) ) {
- colors = new Float32Array( array );
- }
- this.setAttribute( 'instanceColor', new InstancedBufferAttribute( colors, 3 ) ); // rgb
- return this;
- }
- computeBoundingBox() {
- if ( this.boundingBox === null ) {
- this.boundingBox = new Box3();
- }
- const pos = this.attributes.instancePosition;
- if ( pos !== undefined ) {
- this.boundingBox.setFromBufferAttribute( pos );
- }
- }
- computeBoundingSphere() {
- if ( this.boundingSphere === null ) {
- this.boundingSphere = new Sphere();
- }
- if ( this.boundingBox === null ) {
- this.computeBoundingBox();
- }
- const pos = this.attributes.instancePosition;
- if ( pos !== undefined ) {
- const center = this.boundingSphere.center;
- this.boundingBox.getCenter( center );
- let maxRadiusSq = 0;
- for ( let i = 0, il = pos.count; i < il; i ++ ) {
- _vector.fromBufferAttribute( pos, i );
- maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( _vector ) );
- }
- this.boundingSphere.radius = Math.sqrt( maxRadiusSq );
- if ( isNaN( this.boundingSphere.radius ) ) {
- console.error( 'THREE.InstancedPointsGeometry.computeBoundingSphere(): Computed radius is NaN. The instanced position data is likely to have NaN values.', this );
- }
- }
- }
- toJSON() {
- // todo
- }
- }
- export default InstancedPointsGeometry;
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