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Dear users,
since nobody answered in the render theory forum and since I don't know if it was the right forum I will again post my question here:
Does anybody know how I can convert the vray reflection parameters into a fresnel equation on a fx shader?
Let's say I have a reflection of reflectColor RGB (255 255 255) with a fresnel reflection and an Index of Reflection of 1.6 in the vray material. When I look on the material preview, I have little reflection looking from the front and much (the reflectColor) when looking from the side (fresnel effect).
Now, the fx formula for fresnel looks like this:
reflection_factor = fresMin + fresScale * pow(1.0 - abs (dot(V, N), fresExpon));
I understand that fresScale could be the reflectColor mentioned above. fresExpon could be the IOR of 1.6? But how do I calculate fresMin?
And what happens to colors that are "colored", not just grayscale but with a tone? How do I calculate this on top of a reflection cube map and parallely get the fresnel out of it?
Would be helpful if anybody would answer.
Thank you much!
since nobody answered in the render theory forum and since I don't know if it was the right forum I will again post my question here:
Does anybody know how I can convert the vray reflection parameters into a fresnel equation on a fx shader?
Let's say I have a reflection of reflectColor RGB (255 255 255) with a fresnel reflection and an Index of Reflection of 1.6 in the vray material. When I look on the material preview, I have little reflection looking from the front and much (the reflectColor) when looking from the side (fresnel effect).
Now, the fx formula for fresnel looks like this:
reflection_factor = fresMin + fresScale * pow(1.0 - abs (dot(V, N), fresExpon));
I understand that fresScale could be the reflectColor mentioned above. fresExpon could be the IOR of 1.6? But how do I calculate fresMin?
And what happens to colors that are "colored", not just grayscale but with a tone? How do I calculate this on top of a reflection cube map and parallely get the fresnel out of it?
Would be helpful if anybody would answer.
Thank you much!
