fix : avoid approximation accumulation in Bezier curve computation, this was sometimes visible -end point displacement- when using the continue() method

Babylon/Math/babylon.math.ts

@@ -3389,13 +3389,12 @@
         public static CreateQuadraticBezier(v0: Vector3, v1: Vector3, v2: Vector3, nbPoints: number): Curve3 {
             nbPoints = nbPoints > 2 ? nbPoints : 3;
             var bez = new Array<Vector3>();
-            var step = 1 / nbPoints;
             var equation = (t: number, val0: number, val1: number, val2: number) => {
                 var res = (1 - t) * (1 - t) * val0 + 2 * t * (1 - t) * val1 + t * t * val2;
                 return res;
             }
-            for (var i = 0; i <= 1; i += step) {
-                bez.push(new Vector3(equation(i, v0.x, v1.x, v2.x), equation(i, v0.y, v1.y, v2.y), equation(i, v0.z, v1.z, v2.z)));
+            for (var i = 0; i <= nbPoints; i ++) {
+                bez.push(new Vector3(equation(i / nbPoints, v0.x, v1.x, v2.x), equation(i / nbPoints, v0.y, v1.y, v2.y), equation(i / nbPoints, v0.z, v1.z, v2.z)));
             }
             return new Curve3(bez);
         }
@@ -3404,13 +3403,12 @@
         public static CreateCubicBezier(v0: Vector3, v1: Vector3, v2: Vector3, v3: Vector3, nbPoints: number): Curve3 {
             nbPoints = nbPoints > 3 ? nbPoints : 4;
             var bez = new Array<Vector3>();
-            var step = 1 / nbPoints;
             var equation = (t: number, val0: number, val1: number, val2: number, val3: number) => {
                 var res = (1 - t) * (1 - t) * (1 - t) * val0 + 3 * t * (1 - t) * (1 - t) * val1 + 3 * t * t * (1 - t) * val2 + t * t * t * val3;
                 return res;
             }
-            for (var i = 0; i <= 1; i += step) {
-                bez.push(new Vector3(equation(i, v0.x, v1.x, v2.x, v3.x), equation(i, v0.y, v1.y, v2.y, v3.y), equation(i, v0.z, v1.z, v2.z, v3.z)));
+            for (var i = 0; i <= nbPoints; i ++) {
+                bez.push(new Vector3(equation(i / nbPoints, v0.x, v1.x, v2.x, v3.x), equation(i / nbPoints, v0.y, v1.y, v2.y, v3.y), equation(i / nbPoints, v0.z, v1.z, v2.z, v3.z)));
             }
             return new Curve3(bez);
         }