getPoint method
dynamic
getPoint(
- num t,
- dynamic optionalTarget
)
override
Implementation
getPoint( t, optionalTarget ) {
var point = optionalTarget ?? new Vector3();
var u = this.knots[ this.startKnot ] + t * ( this.knots[ this.endKnot ] - this.knots[ this.startKnot ] ); // linear mapping t->u
// following results in (wx, wy, wz, w) homogeneous point
var hpoint = NURBSUtils.calcBSplinePoint( this.degree, this.knots, this.controlPoints, u );
if ( hpoint.w != 1.0 ) {
// project to 3D space: (wx, wy, wz, w) -> (x, y, z, 1)
hpoint.divideScalar( hpoint.w );
}
return point.set( hpoint.x, hpoint.y, hpoint.z );
}