""I'm downloading the demo of Redshift, I'll see what the shader offers!"" i could send you the part about rendering in redshift that i did for my gnomon video could be a good start .. i managed to get close to 90/95 % christophe
Ok, I have something for both Corona and Redshift. Corona: As you suggested making (1 / (1/ior map)) allows to retrieve the correct value. Their is one problem though: Corona shader seems to use a blinn/phong brdf (we use GGX in SD/SP). So we can apply a curve to try to match the glossiness but it can't work for very rough…
Here is a filter to convert baseColor/Metallic/roughness to Vray/Corona/Redshift/Arnold This filter is now by default in SD library (search for PBR converter). Limitations: - in Vray/Corona the fresnel is colored, it's not in SD - a 100% black metal renders black/no reflection in Vray/Corona, in SD the fresnel is still…
I've tested Corona, it does not support IOR < 1. Even though you can plug a bitmap in the IOR input, it looks like it's stuck to 1. The ior is mandatory for the conversion.. :/ In vray, the values bellow 1 represents 1/ior, allowing users to input a texture. Maybe you could ask the devs for that ? :) I'm downloading the…