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