You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
54 lines
1.0 KiB
54 lines
1.0 KiB
6 months ago
|
import {
|
||
|
BufferGeometry,
|
||
|
Float32BufferAttribute
|
||
|
} from 'three';
|
||
|
import { ConvexHull } from '../math/ConvexHull.js';
|
||
|
|
||
|
class ConvexGeometry extends BufferGeometry {
|
||
|
|
||
|
constructor( points = [] ) {
|
||
|
|
||
|
super();
|
||
|
|
||
|
// buffers
|
||
|
|
||
|
const vertices = [];
|
||
|
const normals = [];
|
||
|
|
||
|
const convexHull = new ConvexHull().setFromPoints( points );
|
||
|
|
||
|
// generate vertices and normals
|
||
|
|
||
|
const faces = convexHull.faces;
|
||
|
|
||
|
for ( let i = 0; i < faces.length; i ++ ) {
|
||
|
|
||
|
const face = faces[ i ];
|
||
|
let edge = face.edge;
|
||
|
|
||
|
// we move along a doubly-connected edge list to access all face points (see HalfEdge docs)
|
||
|
|
||
|
do {
|
||
|
|
||
|
const point = edge.head().point;
|
||
|
|
||
|
vertices.push( point.x, point.y, point.z );
|
||
|
normals.push( face.normal.x, face.normal.y, face.normal.z );
|
||
|
|
||
|
edge = edge.next;
|
||
|
|
||
|
} while ( edge !== face.edge );
|
||
|
|
||
|
}
|
||
|
|
||
|
// build geometry
|
||
|
|
||
|
this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
|
||
|
this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
|
||
|
|
||
|
}
|
||
|
|
||
|
}
|
||
|
|
||
|
export { ConvexGeometry };
|