Hi,'txesmi' and thanks for the quick reply! I tried to install the code.
Unfortunately I have no idea about shader programming. I'm 3d graphic artist with little programming knowledge.

That's why I'm reaching my limits. In between I kept looking for a 'color_map + normal_map + specular_map ObjektShader' for 3DGS, but apart from shade-c and shadeC-EVO, I did not find anything. These did not go with me.

I am also afraid that with your tips my proficiency in programming will not be enough to modify the standard 3dgs shader. I do not know which files have to be changed at what point.