maya 独立与 pyside2

Posted 2023-02-16

【中文标题】maya 独立与 pyside2

【英文标题】：maya standalone with pyside2

【发布时间】：2021-06-21 05:28:45

【问题描述】：

当我想在独立的 Maya 中添加 QtWidget 时，错误提示“QWidget：无法在没有 QApplication 的情况下创建 QWidget”。

from PySide2 import QtWidgets
import maya.standalone
maya.standalone.initialize()

QtWidgets.QPushButton()

maya.standalone.uninitialize()

然后我添加了一个 QApplication，错误提示：“一个 QApplication 实例已经存在。”

from PySide2 import QtWidgets
import maya.standalone
import sys
maya.standalone.initialize()

QtWidgets.QApplication(sys.argv)
QtWidgets.QPushButton()

maya.standalone.uninitialize()

我使用QApplication.instance() 我可以获得“QGuiApplication”参考，所以 我知道 maya.standalone() 将创建 qApp，但是如何创建 QWidget（例如 s 对话框...）

================================================ =================

from PySide2 import QtWidgets
import maya.standalone
maya.standalone.initialize()
print(QtWidgets.QApplication.instance())     
maya.standalone.uninitialize()

这是完整的日志：

pymel.core : INFO : Updating pymel with pre-loaded plugins: renderSetup
Warning: file: C:/Program Files/Autodesk/Maya2018/scripts/startup/initialStartup.mel line 179: Y-axis is already the Up-axis
Warning: file: C:\Users\a\Documents\maya\2018\prefs\filePathEditorRegistryPrefs.mel line 4: filePathEditor: Attribute 'aiImage.filename' is invalid or is not designated 'usedAsFilename'.
Warning: file: C:\Users\a\Documents\maya\2018\prefs\filePathEditorRegistryPrefs.mel line 5: filePathEditor: Attribute 'aiPhotometricLight.aiFilename' is invalid or is not designated 
'usedAsFilename'.
Warning: file: C:\Users\a\Documents\maya\2018\prefs\filePathEditorRegistryPrefs.mel line 6: filePathEditor: Attribute 'aiStandIn.dso' is invalid or is not designated 'usedAsFilename'.
Warning: file: C:\Users\a\Documents\maya\2018\prefs\filePathEditorRegistryPrefs.mel line 7: filePathEditor: Attribute 'aiVolume.filename' is invalid or is not designated 'usedAsFilename'.
AbcExport v1.0 using Alembic 1.7.5 (built Feb  6 2018 18:28:08)
Initialized VP2.0 renderer 
  Version : 2016.11.40.12. Feature Level 5.
  Adapter : GeForce RTX 3090/PCIe/SSE2
  Vendor ID: 4318. Device ID : 8708
  Driver : .
  API : OpenGL V.4.6.
  Max texture size : 16384 * 16384.
  Max tex coords : 32
  Shader versions supported (Vertex: 5, Geometry: 5, Pixel 5).
  Shader compiler profile : (Best card profile)
  Active stereo support available : 0
  GPU Memory Limit : 24576 MB.
  CPU Memory Limit: 62178.5 MB.
  MultiDraw consolidation: enabled

OpenCL evaluator is attempting to initialize OpenCL.
Detected 1 OpenCL Platforms: 
 0: NVIDIA Corporation. NVIDIA CUDA. OpenCL 1.2 CUDA 11.2.162.
 Supported extensions: cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_fp64 cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_d3d10_sharing cl_khr_d3d10_sharing cl_nv_d3d11_sharing cl_nv_copy_opts cl_nv_create_buffer cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_khr_device_uuid
OpenCL evaluator choosing OpenCL platform NVIDIA Corporation.
OpenCL evaluator is unable to find a GPU device that can share VBOs with OpenGL.
Warning: file: C:/Program Files/Autodesk/Maya2018/scripts/startup/autoLoadPlugin.mel line 35: Loading plug-in "lookdevKit" has resulted in changes to the scene that may need to be saved.
AbcImport v1.0 using Alembic 1.7.5 (built Feb  6 2018 18:28:08)

<PySide2.QtGui.QGuiApplication object at 0x000001828E9D9108>

【问题讨论】：

print(QApplication.instance()) 的输出是什么？显示完整的日志消息

我在帖子中添加了完整的日志

如果在maya.standalone.initialize() 之前添加QtWidgets.QApplication(sys.argv) 会得到相同的日志吗？

是的，它可以工作，在 maya.standalone.initialize() 创建 Qapp 并加载我的 Qt UI 类，实例化 UI 之前。 maya.standalone.initialize() 完成maya代码作业后，弹出UI窗口。

【参考方案1】：

如果没有先前的 QXApplication，initialize() 函数会创建一个 QGuiApplication，因此一种可能的方法是在调用该函数之前创建一个 QApplication：

app = QtWidgets.QApplication(sys.argv)
maya.standalone.initialize()