def apply_skin(self, keep_skin=False):
data = self.data
skin = self.skin
if not keep_skin:
self.skin = None
deformed_verts = zeros(*data.vertices.shape)
deformed_norms = zeros(*data.normals.shape)
root_to_skin = skin.data.matrix
for bone, bone_data in zip(skin.bones, skin.data.bone_data):
skin_to_bone = bone_data.matrix
bone_matrix = bone.matrix_relative_to(skin.root)
bind_matrix = root_to_skin @ bone_matrix @ skin_to_bone
location, rotation, scale = decompose_uniform(bind_matrix)
# indices and weights
i = bone_data.vertex_weights["f0"]
w = bone_data.vertex_weights["f1"][:, None]
if len(deformed_verts):
deformed_verts[i] += w * (data.vertices[i] @ rotation.T * scale + location.T)
if len(deformed_norms):
deformed_norms[i] += w * (data.normals[i] @ rotation.T)
data.vertices = deformed_verts
data.normals = deformed_norms # TODO: normalize?
def matrix(self, value: ndarray):
self.translation, self.rotation, self.scale = decompose_uniform(value)