Sorry, that's my fault. Yes, indeed, I deleted the original question because the problem has a completely different reason I think. I added some more glGerError() functions and discovered an error dur

So I was able to find out that the 3d texture behaves correctly as much as I can say. At least if I fill it with random values and read it in the fragment shader with: vec4 col = texture3D(tex1, vec3(

The above code gives me black pixels even if the lut3dTex is filled with values of 1.0 so there must be a problem with the usage of the 3dtexture and Qt.

Thanks Patrick, you are right, the result of the log is black because the values are negative, it works correclty.. stupid me. So it has something to do with the lookup table. Is there any way to chec

Found a possible reason for the black image. In the fragment shader code generated by ocio which look like this: vec4 OCIODisplayA(vec4 inPixel, sampler3D lut3d){ vec4 out_pixel = inPixel; out_pixel.r

Hi, I try to make a simple imageviewer with the help of QT and ocio. From the ociodisplay.cpp I tried to extract the needed pieces and transfer it to a Qt workflow. Displaying pictures with OpenGl see