Substance IOR maps vs. V-ray

V-Ray V-Ray for Maya General
1

Hi Guys,

Quick question. I noticed Substance painter outputs a greyscale map with values ranging from 0 to 1 and this needs to be plugged into v-ray’s ‘fresnel ior’. I am used to working with ranges above 1, so this map is kind of confusing. I noticed it looks good in render though. Theory I have is that the substance ior map is an inverted representation of what I am used to working with. Darker values result in higher IOR and lighter values result in lower IOR. The values are super unclear to me and documentation ignores everything. Can anyone explain?

Thanks

2

Yes, afaik it’s 1 / map value for the actual IOR.

3

Ah great, thanks! How did you find this out? :smile:

4

At some point I wrote a substance to vray converter in OSL. : )

5

Thanks Rens. Noted and bookmarked.