On Sat, Aug 3, 2019, 6:45 AM Gabriel <[email protected]>
wrote:
> Hey guys, how are you doing?
>
> I'm trying compile some scripts with Cython and Maya and I've some doubts.
> How can I declare the OpenMaya types on cpdef?
>
> My setup script is this:
>
> from setuptools import setup, Extension
> from Cython.Build import cythonize
> import os
>
>
> def _script_path(module_name):
> return os.path.join(os.path.dirname(__file__), "src",
> module_name).replace("//", "/")
>
>
> setup(
> name="vzUtils",
> ext_modules=cythonize(
> Extension("vzUtils",
> language="c++",
> sources=[_script_path("vzUtils.pyx")],
> include_dirs=[
> "C:/Program
> Files/Autodesk/Maya2019/Python/Lib/site-packages",
> "C:/Program Files/Autodesk/Maya2019/include",
> os.path.join(os.path.dirname(__file__),
> "src").replace("//", "/")
> ],
> libraries=[
> "Foundation",
> "OpenMaya",
> "OpenMayaUI",
> "OpenMayaAnim",
> "OpenMayaFX",
> "OpenMayaRender",
> "Image"
> ],
> library_dirs=[
> "C:/Program Files/Autodesk/Maya2019/lib",
> "C:/Program Files/Autodesk/Maya2019/Python/DLLs"
> ])
> )
> )
>
>
> And my script test is this:
>
> # distiutils: Language=c++
>
> from maya import OpenMaya
>
>
> cpdef list_nodes_connections(node, list node_list):
> if node.isNull():
> return
>
> node_plugs = OpenMaya.MPlugArray()
> fn = OpenMaya.MFnDependencyNode(node)
>
> if fn.typeName() in ["mesh", "polyCurve"]:
> return
>
> fn.getConnections(node_plugs)
> cdef int i = 0
> cdef int k = 0
> for i in range(node_plugs.length()):
> plugs_connected = OpenMaya.MPlugArray()
> node_plugs[i].connectedTo(plugs_connected, True, False)
> for k in range(plugs_connected.length()):
> list_nodes_connections(plugs_connected[k].node(), node_list)
>
> if fn.name() not in node_list:
> node_list.append(fn.name())
>
> I compile this script successfully but the Maya doesn't import them. Maya
> said is not possible to import the DLL...
>
> I tried to declare the Maya's type and resulted in a compilation error.
> Cython said that MObject is unknown type:
>
> cpdef list_nodes_connections(MObject nodes, list node_list):
>
> Have you any idea to fix these errors? How the best practice to use Cython
> and Maya? Must I recompile for each Maya's version linking like C++
> plug-ins?
>
I can comment on the Cython stuff since I have plenty of projects using it,
but not so much on Windows compiling. But you would need to compile it for
each major (and sometimes major.minor) release of Maya.
You have a bit of a mixed situation here with the concepts of what Cython
can do, what you expect, and what you are actually doing. Yes you could be
using the Maya C++ types like MObject, but you are currently doing
everything through the python bindings. This means you are not gaining much
at all from Cython besides statically typing your loop variables. All the
calls and list access is still python. Try this: Use the cython command
line tool to run your pyx file through the "annotate" flag. It will produce
an HTML file of your source that is highlighted with yellow. The darker the
yellow, the more python your code is doing. You want as much white as
possible to indicate C usage. I'm guessing most of your code will be yellow
besides the lines that declare the int variables. This also means that
currently you don't need to be linking against Maya's C++ libraries since
you aren't even using any of its headers and symbols.
So, in order to get much benefit out of this whole process, you would need
to drop the use of the Maya Python imports for the critical performance
sections of your code and declare the parts of the C++ api that you need to
access. I'm answering via mobile so I cant offer examples. But you need to
create a pxd file which includes the correct Maya headers and declares
cppclass items and the methods and fields that you need to expose to
Cython. This example should help:
http://docs.cython.org/en/latest/src/userguide/wrapping_CPlusPlus.html
You could try statically typing more of your variables before they get used
in the loop, and see how far that gets you when you keep checking the
annotated HTML. But I don't know if it will be a huge gain to make it worth
it, without really using C++ types.
> Regards,
> Gabriel Valderramos
>
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