Physical Baised Materials [UDK]

AlanSMitchell

I was just doing some tests in UDK to see if I couldn't figure out physical biased materials.
Reff




Test


Right now the material is pretty clean and basic so far if anyone has any ideas to improve it I'm all ears.

AlanSMitchell

to the best of my knowledge a straight technical artist might be better for making an example of this but I had fun creating this. I'm thinking if I choose to implement this I will need a reflective map to dictate where the reflectivity is. I've heard others refer to it as a roughness map.

marks

PBR requires code changes to work correctly, basically.

Check this thread:
http://www.polycount.com/forum/showthread.php?t=124683

almighty_gir

you need changes to the lighting system for it to work correctly, but you can still make a reasonable estimate.

also, i would interpret the maps as the following:
Albedo ~ Diffuse
Roughness ~ Gloss
Reflectance ~ Specular

the reason for the difference in terms is probably as follows:
Albedo is pure colour, no lighting information baked in like we do currently with diffuse maps.
Roughness is calculated in a specifically measured way and requires a 0-1 input only. Gloss can interpolate that input to a greater range where Roughness "shouldn't".
Reflectance is again, a measured value for a material. there are plenty of sources online which you can get the measured reflective colours for various materials. typically speaking, most non-metals fall into a white 0.04 range, while metals (having no albedo and being pure reflection) have much higher, coloured reflectance. Specular is something that, along with gloss, artists have to fudge to get a pleasing look.

overall, PBR is more about measured results rather than mixing in 3 different maps in different proportions to achieve a look.

AlanSMitchell

I feel dumb for trying ^^ haha
Humm I assume the next Unreal will have it imbedded into the code guess I'll just have to wait till that comes out.