I have created a simple object (a pavement) as an obj file with a texture 512X512 on it.
I managed to import the file in radiance with obj2mesh and create a .cal file.
I have tried to go through the documentation but I haven’t really got how to proceed when it comes to clip_r(r,g,b), clip_g(r,g,b), clip_b(r,g,b) values and pic_u pic_v for the placement of the image.
I read that the first three should prevent “reflectances greater than one” https://www.radiance-online.org/archived/radsite/radiance/digests_html/v1n5.html#COLORPICT
My guess is that, since we superimpose the picture to the material, those values replace the the specularity of the material itself. Would that be correct?
In the same page I see:
clip_r(r,g,b) = min(r,1);
clip_g(r,g,b) = min(g,1);
clip_b(r,g,b) = min(b,1);
Would that suffice for the scope?
As for pic_u and pic_v, they would help positioning the picture that by default is automatically scaled (to one unit square in my case) and centered. Is that correct?
Now I have texture coordinates coming with my obj file that I would like to use, how can I translate those?
Is object2mesh the right translator for me? I think I have read tmesh2rad being a better solution. Is there any example in case?
Sorry for this many questions
Thank you for your help in advance!