Hello everyone, I'm having fun with xGen and his exporter for UnrealEngine. I am trying to create the uv mesh it generates. So I made a script that detects each mesh and calculates the position in the UV space. Only I have a strange behavior in the UV editor. The indexes are good but the polygons are not correct after the first mesh.
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xGen_test.ma
Description: Binary data
# ====================================
# Import Modules
# ====================================
import time
import math
from maya import cmds, OpenMaya
# ====================================
# Misc function
# ====================================
def get_path(s_node):
"""
!@Brief Retrieve MObject from node name
@type s_node: str / unicode
@param s_node: Node name
@rtype: OpenMaya.MDagPath
@return: Maya object.
"""
m_sel_list = OpenMaya.MSelectionList()
m_sel_list.add(s_node)
dp_node = OpenMaya.MDagPath()
m_sel_list.getDagPath(0, dp_node)
return dp_node
# ====================================
# Get Mesh
# ====================================
a_sel = cmds.ls(selection=True, long=True)
if a_sel is None or len(a_sel) == 0:
raise Exception("Select one mesh node")
dp_node = get_path(a_sel[0])
if dp_node.hasFn(OpenMaya.MFn.kTransform) is True:
dp_node.extendToShape()
if dp_node.hasFn(OpenMaya.MFn.kMesh) is False:
raise TypeError("Node selected must be a mesh not {0}".format(dp_node.node().apiTypeStr()))
# ====================================
# Retrieve separate mesh
# ====================================
f_time = time.time()
mfn_mesh = OpenMaya.MFnMesh(dp_node)
mit_mesh = OpenMaya.MItMeshPolygon(dp_node)
d_separate = dict()
i_mesh_id = 0
mit_mesh.reset()
while mit_mesh.isDone() is False:
# Check if this face is new mesh
if d_separate.get(i_mesh_id) is not None:
if len(d_separate[i_mesh_id]["faces"]) != 0 and mit_mesh.index() not in d_separate[i_mesh_id]["faces"]:
i_mesh_id += 1
# Add element to dict
if d_separate.get(i_mesh_id) is None:
d_separate[i_mesh_id] = {"vertices": list(), "faces": list()}
# Add faces
if len(d_separate[i_mesh_id]["faces"]) == 0:
d_separate[i_mesh_id]["faces"].append(mit_mesh.index())
mia_connected_face = OpenMaya.MIntArray()
mit_mesh.getConnectedFaces(mia_connected_face)
for i in range(mia_connected_face.length()):
if mia_connected_face[i] in d_separate[i_mesh_id]["faces"]:
continue
d_separate[i_mesh_id]["faces"].append(mia_connected_face[i])
# Get connected Face from current vertices
mia_face_vertices = OpenMaya.MIntArray()
mit_mesh.getVertices(mia_face_vertices)
for i in range(mia_face_vertices.length()):
if mia_face_vertices[i] in d_separate[i_mesh_id]["vertices"]:
continue
d_separate[i_mesh_id]["vertices"].append(mia_face_vertices[i])
mit_mesh.next()
print ("Retrieve separate mesh take -- {0}".format(time.time() - f_time))
def mesh_check(i_mesh_id):
a_vtx = ["{0}.vtx[{1}]".format(dp_node.fullPathName(), vid) for vid in d_separate[i_mesh_id]["vertices"]]
cmds.select(a_vtx)
# mesh_check(2)
# # ====================================
# # Flatten hair
# # ====================================
# f_time = time.time()
# mpa_points = OpenMaya.MPointArray()
# mfn_mesh.getPoints(mpa_points, OpenMaya.MSpace.kObject)
# for separate_id, d_data in d_separate.items():
# a_vtx = d_data["vertices"]
# i_first = min(a_vtx, key=int)
# i_second = i_first + 1
# for vid in a_vtx:
# if vid < 2:
# continue
# if vid%2 == 0:
# mpa_points.set(mpa_points[i_first], vid)
# else:
# mpa_points.set(mpa_points[i_second], vid)
# print ("Flatten hair take -- {0}".format(time.time() - f_time))
# f_time = time.time()
# mfn_mesh.setPoints(mpa_points, OpenMaya.MSpace.kObject)
# print ("Set Points take -- {0}".format(time.time() - f_time))
# ====================================
# Build UVs
# ====================================
f_time = time.time()
# Init list
i_num_vertices = mfn_mesh.numVertices()
mfa_u = OpenMaya.MFloatArray(i_num_vertices, 0.0)
mfa_v = OpenMaya.MFloatArray(i_num_vertices, 0.0)
# Init iteration
i_num_mesh = len(d_separate.keys())
i_split = int(math.sqrt(i_num_mesh) + 0.5)
f_space = 1.0 / (i_split * 1.5)
i_vtx_id = 0
# Iter row
for i in range(i_split):
# Iter coloumn
for j in range(i_split):
i_id = (i_split * i) + j
if i_id > i_num_mesh - 1:
break
d_mesh = d_separate[i_id]
i_num_mesh_vertices = len(d_mesh["vertices"])
if i_vtx_id >= i_num_vertices:
break
# Iter mesh vertices
for k in range(0, i_num_mesh_vertices, 2):
f_mesh_split = f_space * 0.5
u_pos = (f_space * j) + (f_mesh_split * j)
v_split = f_space / (i_num_mesh_vertices - 1)
v_pos = (v_split * k) + (f_space * i) + (f_mesh_split * i)
mfa_u.set(u_pos, i_vtx_id)
mfa_v.set(v_pos, i_vtx_id)
mfa_u.set(mfa_u[i_vtx_id] + f_space, i_vtx_id + 1)
mfa_v.set(mfa_v[i_vtx_id], i_vtx_id + 1)
i_vtx_id += 2
print "Build UV array take -- {0}".format(time.time() - f_time)
f_time = time.time()
mfn_mesh.setUVs(mfa_u, mfa_v, "map1")
print "Set UV take -- {0}".format(time.time() - f_time)
