def nurbs_revolution_surface(curve, origin, axis, v_min=0, v_max=2 * pi, global_origin=True): my_control_points = curve.get_control_points() my_weights = curve.get_weights() control_points = [] weights = [] any_circle = SvCircle(Matrix(), 1) any_circle.u_bounds = (v_min, v_max) any_circle = any_circle.to_nurbs() # all circles with given (v_min, v_max) # actually always have the same knotvector # and the same number of control points n = len(any_circle.get_control_points()) circle_knotvector = any_circle.get_knotvector() circle_weights = any_circle.get_weights() # TODO: vectorize with numpy? Or better let it so for better readability? for my_control_point, my_weight in zip(my_control_points, my_weights): eq = CircleEquation3D.from_axis_point(origin, axis, my_control_point) if abs(eq.radius) < 1e-8: parallel_points = np.empty((n, 3)) parallel_points[:] = np.array(eq.center) #[np.newaxis].T else: circle = SvCircle.from_equation(eq) circle.u_bounds = (v_min, v_max) nurbs_circle = circle.to_nurbs() parallel_points = nurbs_circle.get_control_points() parallel_weights = circle_weights * my_weight control_points.append(parallel_points) weights.append(parallel_weights) control_points = np.array(control_points) if global_origin: control_points = control_points - origin weights = np.array(weights) degree_u = curve.get_degree() degree_v = 2 # circle return SvNurbsSurface.build(curve.get_nurbs_implementation(), degree_u, degree_v, curve.get_knotvector(), circle_knotvector, control_points, weights)
def __init__(self, center, radius, normal, falloff=None): self.circle = CircleEquation3D.from_center_radius_normal(center, radius, normal) self.falloff = falloff