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View Full Version : From VRayMat to Arch & Design

marlev
06-11-2010, 02:20 PM
Hello!
Im trying to convert Vray materials to Arch & Design. It sounds simple but I found some problems and I have no idea how fix it.
To show you whats going on I have made some screenshots. Simple scene, just a plane, Omni light, no shadows, no GI.

In Vray it looks like this:

http://img29.imageshack.us/img29/7420/vraytest.jpg

http://img821.imageshack.us/img821/508/vraytestmat.jpg


In Mental Ray it looks like this:
http://img412.imageshack.us/img412/6029/mrtest.jpg

http://img193.imageshack.us/img193/4149/mrtestmat.jpg


As you can see the results are diffrent. I noticed that in A&D material I can still control reflectivity by changing numbers even tho I have a bitmap pluged in.
So is it possible to make A&D mats looking same as Vray mats? Maybe its not or maybe Im doing something wrong.
jeb
06-11-2010, 08:40 PM
of course they will be different they both do their own thing when calculating shading. its not like its just something like standard material which is blin or phong trickery.

also with lights you have totally different calculations done in both engines.. if you really want them to look identical i think you will have to eyeball the results till it gets there by comparing on ramplayer or something..


a couple of things that might help you get there..

try checking the blur value on the bitmaps.. vray and mental ray calculate the distance bluring value differently.. antialias settings need to be really high to actually compare tiny details as these.

arch and design material does a really brigh specular spot when not using mr area lights so that might show up as extra shiny in your case.


bump doesnt seem that different but those values might not be equivalent.. try rendering just the bump with plain diffuse to compare. also bumps tend to behave different when using GI.. fg..etc.. so be aware of that..

when you activate highlights and fg only in arch and design then you are way off to getting the same in vray.. thats a cheat pretty unique to mental ray. in your case you havent use it but just be aware of that.

in arch and design are you using the bdrf curve or IOR value?


as far as im concerned you have really similar results from 2 different engines.. just eyeball it a little more and you are on your way.
marlev
06-12-2010, 08:18 AM
Thanks!
I tried everything and it didnt make any diffrence. But I have done another test with chrome material applied to geosphere with glossiness value of 0,75. In Vray results were nice and blury. In MR I had to lower glossiness to make it looking same. So I think thats the problem and both renderers handle glossiness a bit diffrent.

in arch and design are you using the bdrf curve or IOR value?
IOR value of 1.6, same as in Vray.
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06-12-2010, 08:18 AM
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