Initial project import

node_modules/three-stdlib/curves/NURBSCurve.cjs

@@ -0,0 +1,36 @@
+"use strict";
+Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
+const THREE = require("three");
+const NURBSUtils = require("./NURBSUtils.cjs");
+class NURBSCurve extends THREE.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 THREE.Vector4(point.x, point.y, point.z, point.w);
+    }
+  }
+  getPoint(t, optionalTarget) {
+    const point = optionalTarget || new THREE.Vector3();
+    const u = this.knots[this.startKnot] + t * (this.knots[this.endKnot] - this.knots[this.startKnot]);
+    const hpoint = NURBSUtils.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 THREE.Vector3();
+    const u = this.knots[0] + t * (this.knots[this.knots.length - 1] - this.knots[0]);
+    const ders = NURBSUtils.calcNURBSDerivatives(this.degree, this.knots, this.controlPoints, u, 1);
+    tangent.copy(ders[1]).normalize();
+    return tangent;
+  }
+}
+exports.NURBSCurve = NURBSCurve;
+//# sourceMappingURL=NURBSCurve.cjs.map