@lassoan
We had a chat with @pieper today and done some test. There seems to be a disconnect between what our test hardware is capable (Geforce 1080TI) as reported by OpenGL Hardware Capabilitiy viewer (OpenGL Hardware Database by Sascha Willems) and what is reported by VTK/Slicer (and also the WebGL report link that @pieper provided). According to the OpenGL Hardware Capability Viewer
GL_MAX_3D_TEXTURE_SIZE is 16K for 1080TI, as oppose to 2K reported by VTK. Screen shots and the full report is below. I don’t know what to make of this, all I can say same issues persist in the latest Paraview as well.
You can query all reported 1080TI at
https://opengl.gpuinfo.org/listreports
