arc is in the range ]0,1] else it's 1

src/Mesh/babylon.meshBuilder.ts

@@ -258,7 +258,7 @@
         }
 
         public static CreateLathe(name: string, options: { shape: Vector3[], radius?: number, tessellation?: number, arc?: number, closed?: boolean, updatable?: boolean, sideOrientation?: number }, scene: Scene): Mesh {
-            var arc: number = (options.arc <= 0) ? 1.0 : options.arc || 1.0;
+            var arc: number = (options.arc <= 0 || options.arc > 1) ? 1.0 : options.arc || 1.0;
             var closed: boolean = (options.closed === undefined) ? true : options.closed;
             var shape = options.shape;
             var radius = options.radius || 1;
@@ -399,7 +399,7 @@
             var updatable = options.updatable;
             var sideOrientation = options.sideOrientation || Mesh.DEFAULTSIDE;
             var instance = options.instance;
-            options.arc = (options.arc < 0) ? 1 : options.arc || 1;
+            options.arc = (options.arc <= 0 || options.arc > 1) ? 1 : options.arc || 1;
 
             // tube geometry
             var tubePathArray = (path, path3D, circlePaths, radius, tessellation, radiusFunction, cap, arc) => {