Thank you. I think it will be difficult at the Python level, so I am trying to implement the code in C++.
Let's try Array Argument & Return using JSON to String. 2022년 9월 23일 금요일 오후 4시 18분 35초 UTC+9에 Marcus Ottosson님이 작성: > Oh, yes you are. My mistake, I'll need to adjust my glasses before > replying. 😅 > > On Friday, 23 September 2022 at 08:17:07 UTC+1 cds...@gmail.com wrote: > >> hello >> I'm already using from maya.api import OpenMaya. >> So should I use from maya import OpenMaya? >> Is it 1.0 > 2.0? >> >> 2022년 9월 23일 금요일 오후 4시 7분 53초 UTC+9에 Marcus Ottosson님이 작성: >> >>> Thanks, the first potential optimisation I can spot is the use of Maya >>> API 1.0. I would take 2.0 for a spin also - i.e. from maya.api import >>> OpenMaya - I would expect either a small or major improvement, since >>> there is less serialisation going on between Python and C++ in 2.0. >>> >>> On Fri, 23 Sept 2022 at 08:05, daeseok chae <cds...@gmail.com> wrote: >>> >>>> Hello, thanks for the reply. >>>> >>>> I'll show you a simple example of the Python code I'm currently writing. >>>> >>>> ``` >>>> from maya.api import OpenMaya >>>> >>>> DIRECTION_VEC = [OpenMaya.MFloatVector(0, 1, 0), >>>> OpenMaya.MFloatVector(0, -1, 0), OpenMaya.MFloatVector(1, 0, 0), >>>> OpenMaya.MFloatVector(-1, 0, 0)] >>>> mesh = "pCube1" # Deformed >>>> selectionList = OpenMaya.MGlobal.getSelectionListByName(mesh) >>>> mDagPath = selectionList.getDagPath(0) >>>> meshFn = OpenMaya.MFnMesh(mDagPath) >>>> >>>> def isIntersectPoints(meshFn, point): >>>> sourcePt = OpenMaya.MFloatPoint(list(point)) >>>> for directionVec in DIRECTION_VEC: >>>> if not meshFn.anyIntersection(sourcePt, directionVec, >>>> OpenMaya.MSpace.kWorld, 9999, False): >>>> return False; >>>> return True >>>> >>>> idsList = [] >>>> index = 0 >>>> for point in positions: # positions e.g) [(0, 0, 0), (0.5, 0.5, 0.5) >>>> ... ] count : 10,000 >>>> if isIntersectPoints(meshFn, point): >>>> idsList.append(index) >>>> index += 1 >>>> ``` >>>> >>>> Thank you. >>>> 2022년 9월 23일 금요일 오후 3시 50분 3초 UTC+9에 Marcus Ottosson님이 작성: >>>> >>>>> Hello! I can shed some light on these. >>>>> >>>>> I tried to work the Python Loop part with C++ MPxCommand, but I >>>>> couldn’t find a way to return data by executing the Arguments in the form >>>>> of Float3Array (Point Positions) and the corresponding command. (Return : >>>>> IntArray) >>>>> >>>>> If you are certain that looping isn’t going to be fast enough in >>>>> Python, which I don't doubt, then yes this is what I would do. You won’t >>>>> be >>>>> able to return data outside of simple types like integers, floats and >>>>> strings. But what you can do is serialise the data into e.g. JSON and >>>>> output a string, and then deserialise it from Python. This is what I >>>>> normally do. At a certain point, deserialising can become a bottleneck, >>>>> at >>>>> which point you have a JSON deserialiser in PySide2 which may be faster. >>>>> >>>>> It is said that the part can be written in C++ using PyBind, but I >>>>> know that the For Loop speed is limited due to the same GIL issue. Is >>>>> there >>>>> any way to solve it?? >>>>> >>>>> This point was what prompted me to reply - don’t do it! :D >>>>> >>>>> Both MPxCommand and PyBind can work outside of any GIL - they are both >>>>> called outside of Python - and while PyBind *can* return more complex >>>>> types like vectors and even Python objects it is terribly inconvenient to >>>>> work with in Maya. Because Maya - and Python in general - cannot reload >>>>> or >>>>> unload a binary Python module. Yes, you read that right. Once you import >>>>> myBinaryModule you cannot unload it. At all. The only recourse is >>>>> restarting Maya. >>>>> >>>>> Other than that, if that isn’t a problem, then PyBind is a good option >>>>> for this. You can even pass a NumPy data structure, which would bypass >>>>> Python even further and keep all data - especially heavy data - in C++ >>>>> and >>>>> be as fast as it can be. >>>>> >>>>> It seems that there is no way to increase the speed of the current >>>>> Python Loop by raising the speed of the loop as much as possible. >>>>> >>>>> Hard to say without having an example. Loops in Python shouldn’t be a >>>>> bottleneck in general; but it’s possible the repeated access to a Maya >>>>> API >>>>> class could. Are you able to share a small reproducible? Would be curious >>>>> to see what the problem may be. >>>>> >>>>> Best, >>>>> Marcus >>>>> >>>>> On Fri, 23 Sept 2022 at 07:20, daeseok chae <cds...@gmail.com> wrote: >>>>> >>>>>> Hello, >>>>>> >>>>>> I am writing a script that extracts a Point located in a mesh using >>>>>> anyIntersection of MFnMesh. >>>>>> >>>>>> However, there are too many points, so the performance does not come >>>>>> out while looping. >>>>>> >>>>>> So I'm trying to find another way, but it's not easy to find example >>>>>> code. >>>>>> Here's the method I've tried: >>>>>> >>>>>> 1. I tried to work the Python Loop part with C++ MPxCommand, but I >>>>>> couldn't find a way to return data by executing the Arguments in the >>>>>> form >>>>>> of Float3Array (Point Positions) and the corresponding command. (Return >>>>>> : >>>>>> IntArray) >>>>>> 2. It is said that the part can be written in C++ using PyBind, but I >>>>>> know that the For Loop speed is limited due to the same GIL issue. Is >>>>>> there >>>>>> any way to solve it?? >>>>>> 3. It seems that there is no way to increase the speed of the current >>>>>> Python Loop by raising the speed of the loop as much as possible. >>>>>> >>>>>> Loop Count : 1,000,0000 Under >>>>>> anyIntersection: 4 Direction (Up, Left, Right, Down) >>>>>> >>>>>> thank you >>>>>> >>>>>> -- >>>>>> 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_m...@googlegroups.com. >>>>>> To view this discussion on the web visit >>>>>> https://groups.google.com/d/msgid/python_inside_maya/cc20157f-7440-454a-a230-e5cd1d84e47en%40googlegroups.com >>>>>> >>>>>> <https://groups.google.com/d/msgid/python_inside_maya/cc20157f-7440-454a-a230-e5cd1d84e47en%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>> . >>>>>> >>>>> -- >>>> 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_m...@googlegroups.com. >>>> >>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/python_inside_maya/fb93a06b-4cdb-4c94-bf1b-f42d2b8918dan%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/python_inside_maya/fb93a06b-4cdb-4c94-bf1b-f42d2b8918dan%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- You received this message because you are subscribed to the Google Groups "Python Programming for Autodesk Maya" group. 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