Initial project import

node_modules/three-stdlib/curves/NURBSCurve.js

@@ -0,0 +1,36 @@
+import { Curve, Vector4, Vector3 } from "three";
+import { calcBSplinePoint, calcNURBSDerivatives } from "./NURBSUtils.js";
+class NURBSCurve extends Curve {
+  constructor(degree, knots, controlPoints, startKnot, endKnot) {
+    super();
+    this.degree = degree;
+    this.knots = knots;
+    this.controlPoints = [];
+    this.startKnot = startKnot || 0;
+    this.endKnot = endKnot || this.knots.length - 1;
+    for (let i = 0; i < controlPoints.length; ++i) {
+      const point = controlPoints[i];
+      this.controlPoints[i] = new Vector4(point.x, point.y, point.z, point.w);
+    }
+  }
+  getPoint(t, optionalTarget) {
+    const point = optionalTarget || new Vector3();
+    const u = this.knots[this.startKnot] + t * (this.knots[this.endKnot] - this.knots[this.startKnot]);
+    const hpoint = calcBSplinePoint(this.degree, this.knots, this.controlPoints, u);
+    if (hpoint.w != 1) {
+      hpoint.divideScalar(hpoint.w);
+    }
+    return point.set(hpoint.x, hpoint.y, hpoint.z);
+  }
+  getTangent(t, optionalTarget) {
+    const tangent = optionalTarget || new Vector3();
+    const u = this.knots[0] + t * (this.knots[this.knots.length - 1] - this.knots[0]);
+    const ders = calcNURBSDerivatives(this.degree, this.knots, this.controlPoints, u, 1);
+    tangent.copy(ders[1]).normalize();
+    return tangent;
+  }
+}
+export {
+  NURBSCurve
+};
+//# sourceMappingURL=NURBSCurve.js.map