def get_3d_vmob_unit_normal(vmob, point_index):
n_points = vmob.get_num_points()
if vmob.get_num_points() == 0:
return np.array(ORIGIN)
i = point_index
im1 = i - 1 if i > 0 else (n_points - 2)
ip1 = i + 1 if i < (n_points - 1) else 1
return get_unit_normal(
vmob.points[ip1] - vmob.points[i],
vmob.points[im1] - vmob.points[i],
)
def get_3d_vmob_unit_normal(vmob, point_index):
n_points = vmob.get_num_points()
if len(vmob.get_anchors()) <= 2:
return np.array(UP)
i = point_index
im3 = i - 3 if i > 2 else (n_points - 4)
ip3 = i + 3 if i < (n_points - 3) else 3
unit_normal = get_unit_normal(
vmob.points[ip3] - vmob.points[i],
vmob.points[im3] - vmob.points[i],
)
if get_norm(unit_normal) == 0:
return np.array(UP)
return unit_normal
def get_3d_vmob_unit_normal(vmob, point_index):
n_points = vmob.get_num_points()
if len(vmob.get_anchors()) <= 2:
return np.array(UP)
i = point_index
im3 = i - 3 if i > 2 else (n_points - 4)
ip3 = i + 3 if i < (n_points - 3) else 3
unit_normal = get_unit_normal(
vmob.points[ip3] - vmob.points[i],
vmob.points[im3] - vmob.points[i],
)
if get_norm(unit_normal) == 0:
return np.array(UP)
return unit_normal
def get_unit_normal(self, recompute=False):
if not recompute:
return self.data["unit_normal"][0]
if self.get_num_points() < 3:
return OUT
area_vect = self.get_area_vector()
area = get_norm(area_vect)
if area > 0:
return area_vect / area
else:
points = self.get_points()
return get_unit_normal(
points[1] - points[0],
points[2] - points[1],
)
def get_unit_normal(self, recompute: bool = False) -> np.ndarray:
if not recompute:
return self.data["unit_normal"][0]
if self.get_num_points() < 3:
return OUT
area_vect = self.get_area_vector()
area = get_norm(area_vect)
if area > 0:
normal = area_vect / area
else:
points = self.get_points()
normal = get_unit_normal(
points[1] - points[0],
points[2] - points[1],
)
self.data["unit_normal"][:] = normal
return normal
