def flatten(mesh=None, uvset=None):
"""Creates a mesh from the UV layout of another mesh.
I use this to generate flattened versions of meshes from Marvelous Designer to easily use Quad
Draw to create clean meshes and then Transfer Attributes vertex positions through UVs.
:param mesh: Mesh to sample.
:param uvset: UV set name
"""
if mesh is None:
mesh = cmds.ls(sl=True)
if not mesh:
raise RuntimeError("No mesh selected.")
mesh = mesh[0]
o_mesh = shortcuts.get_mobject(shortcuts.get_shape(mesh))
fn_mesh = OpenMaya.MFnMesh(o_mesh)
if uvset is None:
uvset = fn_mesh.currentUVSetName()
vertex_count = fn_mesh.numUVs(uvset)
polygon_count = fn_mesh.numPolygons()
u_array = OpenMaya.MFloatArray()
v_array = OpenMaya.MFloatArray()
fn_mesh.getUVs(u_array, v_array, uvset)
vertex_array = OpenMaya.MPointArray(u_array.length())
for i in range(u_array.length()):
vertex_array.set(i, u_array[i], 0, -v_array[i])
polygon_counts = OpenMaya.MIntArray(polygon_count)
it_poly = OpenMaya.MItMeshPolygon(o_mesh)
polygon_connects = OpenMaya.MIntArray(fn_mesh.numFaceVertices())
face_vertex_index = 0
while not it_poly.isDone():
face_index = it_poly.index()
polygon_counts[face_index] = it_poly.polygonVertexCount()
for i in range(polygon_counts[face_index]):
int_ptr = shortcuts.get_int_ptr()
it_poly.getUVIndex(i, int_ptr)
uv_index = shortcuts.ptr_to_int(int_ptr)
polygon_connects[face_vertex_index] = uv_index
face_vertex_index += 1
it_poly.next()
new_mesh = OpenMaya.MFnMesh()
new_mesh.create(
vertex_count,
polygon_count,
vertex_array,
polygon_counts,
polygon_connects,
u_array,
v_array,
)
new_mesh.assignUVs(polygon_counts, polygon_connects)
def __init__(self, skin_cluster):
"""Constructor"""
self.node = skin_cluster
self.shape = cmds.listRelatives(cmds.deformer(skin_cluster, q=True, g=True)[0], parent=True, path=True)[0]
# Get the skinCluster MObject
self.mobject = shortcuts.get_mobject(self.node)
self.fn = OpenMayaAnim.MFnSkinCluster(self.mobject)
self.data = {
'weights': {},
'blendWeights': [],
'name': self.node,
'shape': self.shape
}