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View Code? Open in Web Editor NEWExperiment of using Julia to do mesh processing in Blender
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Julia code returns lists with Blender's numpy
Comparing the returned values of the subdivide() in catmull-clark.jl call under Blender and from regular Python I noticed the following. This is based on the code in test/subdiv.py, which is also stored in test.blend under (text) in the Blender Text Editor.
Python 3.8.5 (command-line)
melis@juggle 20:46:~/concepts/blender-julia-test/test$ python subdiv.py
/usr/lib/python3.8/site-packages/numpy/__init__.py
1.19.1
/home/melis/.local/lib/python3.8/site-packages/julia/__init__.py
0.5.4
Initializing Julia (this might take a moment the first time)...
Done!
(Julia) Building half edges done in 1.533ms
(Julia) Input: 8 vertices, 6 polygons, 12 polygon edges
(Julia) Output: 26 vertices, 24 quads
(Julia) Subdivision done in 21.688ms
<class 'numpy.ndarray'>
[-0.5555556 -0.5555556 -0.5555556 -0.50617284 -0.50617284 0.6049383
-0.50617284 0.6049383 -0.50617284 -0.4458162 0.5665295 0.5665295
0.6049383 -0.50617284 -0.50617284 0.5665295 -0.4458162 0.5665295
0.5665295 0.5665295 -0.4458162 0.5208048 0.52080476 0.52080476
-1. 0. 0. 0. 1. 0.
1. 0. 0. 0. -1. 0.
0. 0. -1. 0. 0. 1.
-0.75 -0.75 0. -0.75 0. 0.75
-0.75 0.75 0. -0.75 0. -0.75
0. 0.75 0.75 0.75 0.75 0.
0. 0.75 -0.75 0.75 0. 0.75
0.75 -0.75 0. 0.75 0. -0.75
0. -0.75 0.75 0. -0.75 -0.75 ]
<class 'numpy.ndarray'>
[ 1 5 9 13 17 21 25 29 33 37 41 45 49 53 57 61 65 69 73 77 81 85 89 93]
<class 'numpy.ndarray'>
[4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4]
<class 'numpy.ndarray'>
[15 2 16 9 16 4 17 9 17 3 18 9 18 1 15 9 17 4 19 10 19 8 20 10
20 7 21 10 21 3 17 10 20 8 22 11 22 6 23 11 23 5 24 11 24 7 20 11
23 6 25 12 25 2 15 12 15 1 26 12 26 5 23 12 21 7 24 13 24 5 26 13
26 1 18 13 18 3 21 13 19 4 16 14 16 2 25 14 25 6 22 14 22 8 19 14]
Blender 2.90 (Run script from UI)
/home/melis/software/blender-2.90.0-linux64/2.90/python/lib/python3.7/site-packages/numpy/__init__.py
1.17.5
/home/melis/software/blender-2.90.0-linux64/2.90/python/lib/python3.7/site-packages/julia/__init__.py
0.5.4
Initializing Julia (this might take a moment the first time)...
Done!
(Julia) Building half edges done in 0.018ms
(Julia) Input: 8 vertices, 6 polygons, 12 polygon edges
(Julia) Output: 26 vertices, 24 quads
(Julia) Subdivision done in 0.127ms
<class 'list'>
[-0.5555555820465088, -0.5555555820465088, -0.5555555820465088, -0.5061728358268738, -0.5061728358268738, 0.6049383282661438, -0.5061728358268738, 0.6049383282661438, -0.5061728358268738, -0.44581618905067444, 0.5665295124053955, 0.5665295124053955, 0.6049383282661438, -0.5061728358268738, -0.5061728358268738, 0.5665295124053955, -0.44581618905067444, 0.5665295124053955, 0.5665295124053955, 0.5665295124053955, -0.44581618905067444, 0.5208048224449158, 0.520804762840271, 0.520804762840271, -1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 0.0, 0.0, -1.0, 0.0, 0.0, 0.0, -1.0, 0.0, 0.0, 1.0, -0.75, -0.75, 0.0, -0.75, 0.0, 0.75, -0.75, 0.75, 0.0, -0.75, 0.0, -0.75, 0.0, 0.75, 0.75, 0.75, 0.75, 0.0, 0.0, 0.75, -0.75, 0.75, 0.0, 0.75, 0.75, -0.75, 0.0, 0.75, 0.0, -0.75, 0.0, -0.75, 0.75, 0.0, -0.75, -0.75]
<class 'list'>
[1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57, 61, 65, 69, 73, 77, 81, 85, 89, 93]
<class 'list'>
[4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4]
<class 'list'>
[15, 2, 16, 9, 16, 4, 17, 9, 17, 3, 18, 9, 18, 1, 15, 9, 17, 4, 19, 10, 19, 8, 20, 10, 20, 7, 21, 10, 21, 3, 17, 10, 20, 8, 22, 11, 22, 6, 23, 11, 23, 5, 24, 11, 24, 7, 20, 11, 23, 6, 25, 12, 25, 2, 15, 12, 15, 1, 26, 12, 26, 5, 23, 12, 21, 7, 24, 13, 24, 5, 26, 13, 26, 1, 18, 13, 18, 3, 21, 13, 19, 4, 16, 14, 16, 2, 25, 14, 25, 6, 22, 14, 22, 8, 19, 14]
Summary
Python 3.8.5 (command-line):
subdivide()returns a tuple of 4numpy.ndarrayvalues, as expected- NumPy version 1.19.1
- PyJulia version 0.5.4
Blender 2.90 (UI):
subdivide()returns a tuple of 4 lists- Python 3.7.7 (as included in Blender)
- NumPy 1.17.5
- PyJulia 0.5.4
So the differences are probably caused by a different version for Python and/or NumPy.
Rebuilding PyCall from within Blender ((rebuild pycall) text tab) makes no difference.
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