All posts related to V2
User avatar
By eric nixon
#370377
erm.. I was wrong in the last post about needing refraction for retroref fabric.

I ran another test with just one surface and a normal map of fine indented pyramids, seems to work well, surface alongside just for reference (metallic glossy plastic).

Image

3min render bench 7000, detailed hdri.
User avatar
By eric nixon
#370379
er, that previous render isnt working well in subsequent tests,....

Brian, your nearly modelling atoms now? thats not so practical..
User avatar
By eric nixon
#370384
Well I'm still confused, but this is result with camra mounted light, 5mins.. might just be some kind of satin rather than true retroreflection.

Image

This is normal map used at 60% with x-flipped

Image
User avatar
By tom
#370385
You got it, Brian! ;) Now make quite a lot of them.... :mrgreen:

Eric, you are not reading me. So, again:
tom wrote:It's quite hard to simulate this material accurately using normal/bump mapping. Ideally, it requires to be modeled accurately down to the microns or needs a dedicated shader.
...where "hard" politely means "not possible"... oh ;)
User avatar
By eric nixon
#370389
Yes I didnt read that post. Oscar once said it should be possible with positive assymetry but maybe he was wrong.

The two surface approach is very difficult to fine tune so its practically impossible to make the ray refract, reflect then refract again so it goes back the way it came in, the normal maps cant indent enough without artifacts, and the ND needs to be correct, AND the gap between the surfaces needs to be just right :?
User avatar
By eric nixon
#370396
No, he was right!

Success! :D Heres 2 images where just the camera has moved, the front panel of the shirt has less than 1mm thickness with an sss based mxm, ND 1.00001, pos assym .8, roughness 7, scattering 6000, attenuation 40nm. NO MAPS USED

1st image; camera is aligned to main light (camera flash)
Image Image
User avatar
By tom
#370403
Retroreflection has nothing to do with SSS but still very nice! In other words, you replaced a real phenomenon with a virtual one. It reminds me, "If you can't make it, fake it!" But, OK. This is clever! ;)
User avatar
By eric nixon
#370405
Yes, and thanks,.... not originally my idea though.. to be fair.
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