Question about OpenGL, QML, and color representation

[Tyronnosaurus 7]

In the FEM plugin I'm developing, I've got a disparity between color tones in the OpenGL-rendered object and in the color chart:

 

For example, the max tension is represented as red (255, 0, 0, 1), both in rendering and inside QML. The 4 lower vertices of the cube have the max tension, so they should have the same red (but they're clearly pinkier).

 

I'm rendering with the simplest shader, default.shader, so there's no special color or lightning effects (diffusion, specularity...)  that I know of. I've just recently started learning about shaders.

 

If we look at similar things that Cura does, there doesn't seem to be a great disparity between colors in rendering and colors in QML legends:

 

Has the Cura team done something I'm missing?

 

[nallath 1,123]

Without seeing the code, it's a bit hard to say. But have you perhaps set opacity somehow?

[ahoeben 1,965]

Sometimes RenderDoc can be useful to debug rendering issues. https://renderdoc.org/

It could be that the model is rendered with the correct colors but something else is drawn over it.