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.
63 lines
1.6 KiB
63 lines
1.6 KiB
6 months ago
|
import {
|
||
|
|
Vector4
|
||
|
|
} from 'three';
|
||
|
|
import * as NURBSUtils from '../curves/NURBSUtils.js';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* NURBS volume object
|
||
|
|
*
|
||
|
|
* Implementation is based on (x, y, z [, w=1]]) control points with w=weight.
|
||
|
|
**/
|
||
|
|
|
||
|
|
class NURBSVolume {
|
||
|
|
|
||
|
|
constructor( degree1, degree2, degree3, knots1, knots2, knots3 /* arrays of reals */, controlPoints /* array^3 of Vector(2|3|4) */ ) {
|
||
|
|
|
||
|
|
this.degree1 = degree1;
|
||
|
|
this.degree2 = degree2;
|
||
|
|
this.degree3 = degree3;
|
||
|
|
this.knots1 = knots1;
|
||
|
|
this.knots2 = knots2;
|
||
|
|
this.knots3 = knots3;
|
||
|
|
this.controlPoints = [];
|
||
|
|
|
||
|
|
const len1 = knots1.length - degree1 - 1;
|
||
|
|
const len2 = knots2.length - degree2 - 1;
|
||
|
|
const len3 = knots3.length - degree3 - 1;
|
||
|
|
|
||
|
|
// ensure Vector4 for control points
|
||
|
|
for ( let i = 0; i < len1; ++ i ) {
|
||
|
|
|
||
|
|
this.controlPoints[ i ] = [];
|
||
|
|
|
||
|
|
for ( let j = 0; j < len2; ++ j ) {
|
||
|
|
|
||
|
|
this.controlPoints[ i ][ j ] = [];
|
||
|
|
|
||
|
|
for ( let k = 0; k < len3; ++ k ) {
|
||
|
|
|
||
|
|
const point = controlPoints[ i ][ j ][ k ];
|
||
|
|
this.controlPoints[ i ][ j ][ k ] = new Vector4( point.x, point.y, point.z, point.w );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
getPoint( t1, t2, t3, target ) {
|
||
|
|
|
||
|
|
const u = this.knots1[ 0 ] + t1 * ( this.knots1[ this.knots1.length - 1 ] - this.knots1[ 0 ] ); // linear mapping t1->u
|
||
|
|
const v = this.knots2[ 0 ] + t2 * ( this.knots2[ this.knots2.length - 1 ] - this.knots2[ 0 ] ); // linear mapping t2->v
|
||
|
|
const w = this.knots3[ 0 ] + t3 * ( this.knots3[ this.knots3.length - 1 ] - this.knots3[ 0 ] ); // linear mapping t3->w
|
||
|
|
|
||
|
|
NURBSUtils.calcVolumePoint( this.degree1, this.degree2, this.degree3, this.knots1, this.knots2, this.knots3, this.controlPoints, u, v, w, target );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
export { NURBSVolume };
|