# We need the absolute normals as generated by Blender
							for shape_vert in shape.vertices:
								shape_vert.co -= ob.data.vertices[shape_vert.index].co - corrective_target.vertices[shape_vert.index].co

					shape.calc_normals_split()

					for ob_loop in ob.data.loops:
						shape_loop = shape.loops[ob_loop.index]
						norm = shape_loop.normal

						if corrective:
							base = Vector(ob_loop.normal)
							for corrective_target in corrective_target_shapes:
								# Normals for corrective shape keys are deltas from those of the deformed mesh, not the basis shape.
								base += corrective_target.loops[shape_loop.index].normal - ob_loop.normal
						else:
							base = ob_loop.normal

						if norm.dot(base.normalized()) < 1 - 1e-3:
							shape_norms.append(datamodel.Vector3(norm - base))
							shape_normIndices.append(shape_loop.index)

						if wrinkle_scale:
							delta_len = delta_lengths[ob_loop.vertex_index]
							if delta_len:
								max_delta = max(max_delta,delta_len)
								wrinkle.append(delta_len)
								wrinkleIndices.append(texcoIndices[ob_loop.index])

					del shape_vert

					if wrinkle_scale and max_delta:
						wrinkle_mod = wrinkle_scale / max_delta
						if wrinkle_mod != 1:
							for i in range(len(wrinkle)):
								wrinkle[i] *= wrinkle_mod