hey quick follow up on this...finally got a bit of time to start on this
more...but getting an odd issue...or it could be a normal thing.
code for adding :
poseFilePath = tAttr.create("PoseFile", "psf", MFnData::kString);
tAttr.setUsedAsFilename(true);
tAttr.setStorable(true);
tAttr.setKeyable(false);
addAttribute(poseFilePath);
attributeAffects(poseFilePath, outputMatrix);
in my compute :
if (plug != outputMatrix)
{
if (plug == poseFilePath)
{
fileUpdate = false;
MStreamUtils::stdOutStream() << "update " << std::endl;
}
return MS::kUnknownParameter;
}
if (fileUpdate == false)
{
MPlug filePath(myNode, poseFilePath);
char file = filePath.asChar();
MStreamUtils::stdOutStream() << "bob " << std::endl;
MStreamUtils::stdOutStream() << file << std::endl;
fileUpdate = true;
}
So the issue : when I set the file, it doesnt run the compute at all. it
will only run compute when one of the other attrs is changed. What
should I do to get it to run when the file is updated or set?
On Tue, May 18, 2021 at 12:29 PM Justin Israel <justinisr...@gmail.com>
wrote:
>
>
> On Wed, May 19, 2021 at 7:21 AM Marcus Ottosson <konstrukt...@gmail.com>
> wrote:
>
>> pybind11 is great, but it is increeeedibly slow to compile. Like 20
>> seconds for a handful of bound methods. It’s insane.
>>
>> That aside, I’ve got a recent project that might make a good example of
>> what it is and how it can be used to re-create the Maya Python API.
>>
>> - https://github.com/mottosso/cmdc
>>
>>
> Nice one! Well, slow compile time is probably better than carrying around
> a boost dependency and dealing with symbol conflicts :-)
>
>
>>
>>
>>
>> On Tue, 18 May 2021 at 19:53, Alok Gandhi <alok.gandhi2...@gmail.com>
>> wrote:
>>
>>> Thanks Justin! pybind definitely seems interesting.
>>>
>>> And yes, Cython is definitely great. I have used it in production
>>> previously for some generic algorithms implementations where performance
>>> was needed in python centric api interface. And it is super easy to write
>>> too.
>>>
>>> On Tue, May 18, 2021, 23:58 Justin Israel <justinisr...@gmail.com>
>>> wrote:
>>>
>>>>
>>>>
>>>> On Wed, May 19, 2021 at 6:10 AM Alok Gandhi <alok.gandhi2...@gmail.com>
>>>> wrote:
>>>>
>>>>> As a side note, for generic use (outside of maya) you can use boost
>>>>> python to call python from C++ and vice versa:
>>>>>
>>>>> https://www.boost.org/doc/libs/1_63_0/libs/python/doc/html/tutorial/index.html
>>>>>
>>>>
>>>> Boost is a super heavy dependency. These days pybind11 might be a
>>>> better choice if your project is C++ centric:
>>>> https://github.com/pybind/pybind11
>>>>
>>>> It's header-only so you don't have to worry about boost version
>>>> conflicts.
>>>>
>>>> And if you have a python-centric project, cython is pretty good for
>>>> being able to call into C++. It also produces a library that has no runtime
>>>> link dependency to anything since it transpiles to C and only links against
>>>> Python.
>>>>
>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Tue, May 18, 2021, 23:30 Todd Widup <todd.wi...@gmail.com> wrote:
>>>>>
>>>>>> Thanks Marcus,
>>>>>> the txt file will be just a bunch of values and matrices ... it might
>>>>>> be binary it might be ascii..not 100% yet, depends how big the files
>>>>>> get..... was leaning towards JSon for easy of use/setup
>>>>>> the python Q was purely curiosity
>>>>>>
>>>>>> On Tue, May 18, 2021 at 9:50 AM Marcus Ottosson <
>>>>>> konstrukt...@gmail.com> wrote:
>>>>>>
>>>>>>> what would I use to allow the plugin to read an external user
>>>>>>> specified file, either a txt or json?
>>>>>>>
>>>>>>> You could make a string attribute on the node, and set
>>>>>>> MFnAttribute::isUsedAsFilename
>>>>>>> = true
>>>>>>> <https://help.autodesk.com/view/MAYAUL/2020/ENU/?guid=__cpp_ref_class_m_fn_attribute_html#a47fb4f02f1619e47363c39c9794d8191>,
>>>>>>> which will let users browse for a file.
>>>>>>>
>>>>>>> Once you’ve got access to a path from C++, have a look at RapidJSON
>>>>>>> <https://rapidjson.org/> or nlohmann/json
>>>>>>> <https://github.com/nlohmann/json> for a fast or convenient option,
>>>>>>> in that order. They’re both header-only and work just fine with
>>>>>>> something
>>>>>>> like Maya. You’ll likely get more options from others, because there are
>>>>>>> just so many options here. If you drill down into more specifics about
>>>>>>> your
>>>>>>> requirements, e.g. should it be human-readable? Does it need to be JSON?
>>>>>>> Does it need to be small? Network friendly? Is the data large, like a
>>>>>>> pointcache or small like a set of attributes? Will you be serialising
>>>>>>> data?
>>>>>>> Would you need something that can be deserialised into the same data
>>>>>>> structure? Etc.
>>>>>>>
>>>>>>> is there a way to have a C++ plugin run python at all?
>>>>>>>
>>>>>>> Yes, you can either call on Maya’s Python from C++ via
>>>>>>> MGlobal::executePythonCommand("print('hello
>>>>>>> world!')");
>>>>>>> <https://help.autodesk.com/view/MAYAUL/2020/ENU/?guid=__cpp_ref_class_m_global_html#af47e37db0e53940620c6cd1f1111e41d>
>>>>>>> or you can embed another Python yourself and call that. The latter would
>>>>>>> have the benefit of not polluting the global Python namespace and
>>>>>>> memory,
>>>>>>> and is something you could use to spin up multiple Python interpreters
>>>>>>> in
>>>>>>> parallel if your code is performance sensitive (though I’d question why
>>>>>>> you’d turn to Python in that case).
>>>>>>>
>>>>>>> On Tue, 18 May 2021 at 16:34, Todd Widup <todd.wi...@gmail.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> me writing maya plugins has been limited to mostly utility nodes
>>>>>>>> and an occasionally deformer. I am working on something a bit bigger
>>>>>>>> and
>>>>>>>> what would I use to allow the plugin to read an external user specified
>>>>>>>> file, either a txt or json? also, been wondering, is there a way to
>>>>>>>> have a
>>>>>>>> C++ plugin run python at all?
>>>>>>>>
>>>>>>>> --
>>>>>>>> Todd Widup
>>>>>>>> Creature TD / Technical Artist
>>>>>>>> todd.wi...@gmail.com
>>>>>>>>
>>>>>>>> --
>>>>>>>> You received this message because you are subscribed to the Google
>>>>>>>> Groups "Python Programming for Autodesk Maya" group.
>>>>>>>> To unsubscribe from this group and stop receiving emails from it,
>>>>>>>> send an email to python_inside_maya+unsubscr...@googlegroups.com.
>>>>>>>> To view this discussion on the web visit
>>>>>>>> https://groups.google.com/d/msgid/python_inside_maya/CABBPk35P29DnsEqw3Chjv%2Biy0GuHkRFDOaf-jJx_o5moTA1e%2Bg%40mail.gmail.com
>>>>>>>> <https://groups.google.com/d/msgid/python_inside_maya/CABBPk35P29DnsEqw3Chjv%2Biy0GuHkRFDOaf-jJx_o5moTA1e%2Bg%40mail.gmail.com?utm_medium=email&utm_source=footer>
>>>>>>>> .
>>>>>>>>
>>>>>>> --
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>>>>>>> .
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Todd Widup
>>>>>> Creature TD / Technical Artist
>>>>>> todd.wi...@gmail.com
>>>>>>
>>>>>> --
>>>>>> You received this message because you are subscribed to the Google
>>>>>> Groups "Python Programming for Autodesk Maya" group.
>>>>>> To unsubscribe from this group and stop receiving emails from it,
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>>>>>> <https://groups.google.com/d/msgid/python_inside_maya/CABBPk34qLGDCYOqxnck7y-o1LYaZRaSa%3D1OB4CdE%2BZXuqE3aRg%40mail.gmail.com?utm_medium=email&utm_source=footer>
>>>>>> .
>>>>>>
>>>>> --
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>>>>> <https://groups.google.com/d/msgid/python_inside_maya/CAPaTLMQ7LY0OBFdE8t%2BJAs4z5VizR-X-ZHMCY5HgDaS0%3DDCjkg%40mail.gmail.com?utm_medium=email&utm_source=footer>
>>>>> .
>>>>>
>>>> --
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>>>> <https://groups.google.com/d/msgid/python_inside_maya/CAPGFgA1sZj%2BYZ9VxCo66u5sUOrndB4BQSKh-h-YEOWLTWLd%3DuA%40mail.gmail.com?utm_medium=email&utm_source=footer>
>>>> .
>>>>
>>> --
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>>> .
>>>
>> --
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>> <https://groups.google.com/d/msgid/python_inside_maya/CAFRtmOBs2U%3D_dEcPa%2BgxdV_gYLr6wL%3Dgs3kfXm1xpY%3DGNFYVgQ%40mail.gmail.com?utm_medium=email&utm_source=footer>
>> .
>>
> --
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> .
>
--
Todd Widup
Creature TD / Technical Artist
todd.wi...@gmail.com
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