def by_outside(vertices, edges, faces, percent, center):
face_normals = pols_normals(vertices, faces, output_numpy=True)
center = Vector(center[0])
def get_center(face):
verts = [Vector(vertices[i]) for i in face]
result = Vector((0, 0, 0))
for v in verts:
result += v
return (1.0 / float(len(verts))) * result
values = []
for face, normal in zip(faces, face_normals):
face_center = get_center(face)
direction = face_center - center
dirlength = direction.length
if dirlength > 0:
value = math.pi - direction.angle(normal)
else:
value = math.pi
values.append(value)
threshold = map_percent(values, percent[0])
out_face_mask = [(value >= threshold) for value in values]
return out_face_mask
def by_normal(vertices, edges, faces, percent, direction):
face_normals = pols_normals(vertices, faces, output_numpy=True)
np_dir, np_percent = numpy_match_long_repeat(
[np.array(direction), np.array(percent)])
values = np_dot(face_normals[:, np.newaxis], np_dir[np.newaxis, :], axis=2)
threshold = map_percent(values, np_percent)
out_face_mask = np.any(values >= threshold, axis=1)
return out_face_mask
def face_light_factor(vecs, polygons, light):
return (np_dot(pols_normals(vecs, polygons, output_numpy=True), light)*0.5+0.5).tolist()