VTK Backplot on RPi 4

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01 Sep 2020 21:56 #180366 by tommylight

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02 Sep 2020 00:26 #180378 by persei8
Replied by persei8 on topic VTK Backplot on RPi 4
Good suggestion but it looks like another dead end. It appears that libgl1-mesa-swx11 has been deleted from the repos or at least there is no installation candidate for buster. It's too bad because everything else works, just not the gcode_graphics. Until this is resolved, I don't see how anyone can use an rpi4 for linuxcnc.

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02 Sep 2020 06:41 #180399 by tommylight
Replied by tommylight on topic VTK Backplot on RPi 4
Does Axis GUI work properly ?

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02 Sep 2020 13:48 #180434 by persei8
Replied by persei8 on topic VTK Backplot on RPi 4
Yes it does. Maybe because it's a software implementation of opengl instead of using a GPU?

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02 Sep 2020 14:40 #180439 by tommylight
Replied by tommylight on topic VTK Backplot on RPi 4

persei8 wrote: Yes it does. Maybe because it's a software implementation of opengl instead of using a GPU?

I think it was the other way round.
Does by any chance VTK use Vulcan as an rendering engine?

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02 Sep 2020 20:55 #180465 by persei8
Replied by persei8 on topic VTK Backplot on RPi 4
No idea. I'm going to install the whole outfit on a laptop and see if I can sort any of this out. The vtk backplot works on the rpi with qtpyvcp so maybe it's possible to use vtk with qtvcp. If that turns out to be a huge project, then I give up because it is not my area of expertise.
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02 Sep 2020 20:58 #180467 by tommylight
Replied by tommylight on topic VTK Backplot on RPi 4

persei8 wrote: If that turns out to be a huge project, then I give up because it is not my area of expertise.

Knowing you, i am pretty sure you will do something about it. :)

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04 Sep 2020 03:34 #180622 by scotta
Replied by scotta on topic VTK Backplot on RPi 4
I have some good news. After many many attempts to get OpenGL working with VTK back plot I have a working version.

VTK6.3.0 uses the legacy rendering backend. This would be the most compatible but I have not been able to build this against Qt5 at all.

VTK7.1 is now working with OpenGL legacy backend and works with both the fake and full OpenGL KMS drivers. Much smoother indeed.

I'm just in the process of working on VTK8.3 to enable GL ES functionality, hopefully this will fix some issues I have with a new widget for QtPyVCP which uses some OpenGL functionality that fails on the RPi.

I can share the updated deb package for VTK7.1.


Scott
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05 Sep 2020 05:52 #180781 by scotta
Replied by scotta on topic VTK Backplot on RPi 4
I've published the new VTK7.1.1 deb package and updated instructions.

scottalford75.github.io/LinuxCNC-on-RPi/...20for%20QtPyVCP.html

Tested on RPi 3B and 3B+. Appreciate an RPi 4 tester.

Thanks

Scott
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08 Sep 2020 21:12 #181322 by persei8
Replied by persei8 on topic VTK Backplot on RPi 4
So some further developments, here's a screenshot of Scott's new vtk package running on a RPi4 running qtvcp with a gcode file of over 280000 lines. It seems to run fairly well but I have more testing to do. It's weird that while I was porting the vtk backplot to run on qtvcp, it didn't show the gcode preview image, but it does on the pi. It was the same behaviour when running probe_basic so I don't think I broke anything. Anyway, it would appear we are making some headway in the Pi4 department.
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