VTK8.2: Color buffer depth

(Meng Xiong) #1

I’m currently running VTK8.2 and python3.7 on the new Mac Mini 2018. However, the vtkPropPicker throw the following error:

ERROR: In /VTK 8.2.0/Rendering/Core/vtkHardwareSelector.cxx, line 288
vtkOpenGLHardwareSelector (0x7fa1d4a9aa80): Color buffer depth must be at least 8 bit. Currently: 0, 8, 8

The vtkPropPicker was working with VTK8.1 but not sure why it does not work with VTK8.2

(Ken Martin) #2

I believe this is fixed in VTK master.

(Meng Xiong) #3

Yes. This problem is resolved in VTK-master.

#4

Hi,

I’m still experiencing issues with the colorbuffer in my picker. Is this problem resolved in the final 8.2.0 release (current release branch 3bea923b3c)?

If not, could you point me to the commit that fixed the issue in the master branch?

Thanks,
Christophe

(Ken Martin) #5

Fixed in https://gitlab.kitware.com/vtk/vtk/merge_requests/4940 which is 7 months old but too new for 8.2

#6

Hi Ken,

Thanks for the info. I fixed my issues by turning off FXAA anti-aliassing, don’t really know why that influenced the color buffer.

(Ken Martin) #7

I can answer that :slight_smile: The color buffer code checks for error conditions and if it finds an error it returns 0 for that color. Unfortunately the old code did not clear any prior errors before checking. So any prior OpenGL error would cause the red channel to report 0 depth. In this case it seems FXAA is causing an OpenGL error on your system which then causes the issue in reporting the color depth. The fixed code should be immune to prior opengl errors.