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How To Use

 subtile dispersion glass (or so)

  subtile dispersion glass (or so) by bas_rs

Category Glass
Date 2006-12-30 15:56:45
Rendertime 02:08:00
System 2.2ghz amd not mine though
Vray version -
3dsmax version -
Comment hi folks

i was thinking bout this colorful dispersion effect i saw in brazil or fR, dunno exactly so i tried to do something like that with vRay.

i found the dispersion.mat file from emerey (http://www.vray-materials.de/all_materials.php?mat=484) but it didnt supposed to be like what i was looking for. the other day i had a funny crystal ball in my hand i realised this funny effect appears just on the outer borders .. probably just on a flat angle so i changed the mat a little.

its still based on the 3 pass idea with the comp. mat but here i added camera-z frenzel falloff maps to IOR.

i dont know how this is working but it looks like a map with 100% white = 1.0 IOR, less goes down ofc, so i added vrayColor to the falloff map with rgb output more then 1. the problem here is .. how do you know what the real IOR will be with a color ? anyway, ..

the mat is more or less glass or some transparent plastic .. the falloff RGB IOR spread is very subtile so you gotta zoom a little to see the effect but i think this is more the way we see this effect in real world... as far as we can say this effect is real like that at all.

it looks like the dispersion effect on this crystal ball i had appears only on the backside of the surface O_o .. also on a reflecting base not refracting. so if anyone of you folks got an idea of the real nature of this effect let me know :)

on the example image i didnt use blurry refraction cos my rendering time was funny enough already so if you want a more realtic look you gotta add some blur. in the end i'd rather like to find a solution with a one-pass-shader .. 3 pass is accurate with the bonus of adding more effects on RGB chans to other properties like spec.highlight but yea .. freaking cpu hungry.


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ledflex wrote: Thanks

msvera wrote: thankx

schreck wrote: thanks

malalayka12 wrote: woow very nice

ChrisA wrote: can someone explain why can I only donwload a word doc ??

JHalton wrote: Really, really nice mate! Using it for loads of product visuals. Thanks! Dan

ChukA wrote: fgdf

PunkGuy wrote: I like this!

mihaius wrote: the color effect should occur in some certain angles... this is not physical correct.. and the render time is way, waaaay, waaaaaaay too.. you know...

gigg_s wrote: goog

shiftdelete wrote: thanks

3dhattrick wrote: very nice

cool-600 wrote: thank you very mach

sali21 wrote: nice

fa-mo wrote: thank you

umam wrote: rate this material with 10 points

ZeroJustice wrote: mmm the problem si not compatible whit V-ray 1.47

chandni wrote: great

mouzaco wrote: faaaaaaaaaaantastic!!!!!!

djrangu wrote: try re-installing your vray engine

dezivn wrote: rated this material with 10p

doug56_53 wrote: Very nice results - Thanks

Murderdoll wrote: Not Bad...!

Smart wrote: Great work!

bas_rs wrote: yep its native. R8 sp3 vray 1.5 .. maybe just a version problem. anyway .. its quiet easy re reproduce this kind of shader. take the vrayBlend mat and mit 3 vrayMats .. the blend mat uses colors to mix the 3 "sub" mats. so .. first with 100% red, 2nd w/ green last w/ blue. thats it. all three "sub" mats get little different IOR values like 1.52 1.54 1.56 or something and white refraction, cos the rgb mix is happening with the blend mat. in my case i used falloff maps on IOR to simulate a more realistic behaviour. do not use additive mixing. you might get the same idea i got in the first place and you will fail. if you mix a red/green/blue glass mat with 100% addition you will get the same result but .. the shadow will be darken out. not that kind of transparent shadow you expect. thats why a shelliac (spelling) mat will fail also. the vrayBlend mat supports additive mixing but you dont have to use it .. and you shouldnt. cheers

bas_rs wrote: uh .. does it say which dll it is ? .. its supposed to be vRay 1.5 native. no additionals plugins used... i think. gonna check it later if something slipped through.

vbn wrote: It's 1.5 I had problems with another dispersion mat. That's strange.

Marco wrote: vbn: What version of v-ray do you have?

vbn wrote: I have problems with the mat. Max says I have missing dlls. What could be the problem ?

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