faking dispersion using the new blend material

[Clifton Santiago]

@Gijs,

Can you repost the images from your first post in this thread? They are dead links now...

Cheers

[Clifton Santiago]

Thanks, Cheers.

[davemcd]

Can anyone get the dispersion to work in RC4? I've tried both techniques here and get really bad results.

By my figuring using the same glass material in each slot and masking by the full red or green as Vlado suggest should give you the same as you original material (giving you room then to adjust the IOR till you get nice results)

However even with the same IOR I get a very wide spread of strange flat colours. Even the material editor slot looks coloured which I would not expect.

Am I just doing it wrong or has something changed in RC4?

DaveMcD

[Clifton Santiago]

I wouldn't know. Apparently I am not special enough to have RC4...

I've never gotten it to work in RC2 though

[Paul Oblomov]

So, as far as I see - there's no way to make smooth transition between blend colors ?

[Paul Oblomov]

This is what I get, of course this is not straight from max. This is a mix of five channel in post, to add glow.

[Paul Oblomov]

Here's my attempt

[Paul Oblomov]

Wanted to ask - is there a way to speed up vrayblend caustics ? As it totaly unusable.

[vlado]

You can try to use very slight refraction glossiness in the glass materials (like 0.99 or something).

Best regards,
Vlado

[Paul Oblomov]

Already using it - 0.95

P.S. BTW - can I extract per material channel separately in one pass ? Like in mentalray. Smth like a map placed in any 3dsmax slot, that can be checked in render elements. Or for a Vray blend material - I want to save all the coat materials below base one. Not their initial state (three glass materials for my diamond mat), but the mixed one. Simple - red, green and blue (they have different IOR) materials refraction to be in separate layers in one pass. Dunno, if Material ID will work.

[vlado]

Yep, use the VRayMtlSelect render element. You can put any of the sub-materials of the VRayBlendMtl there, and it will extract just this material into its own render element, with their weight in the final image included.

Best regards,
Vlado

[Paul Oblomov]

Guys. Tried my material in simple studio env. - looks bad
Any ideas on how to improve it ?

BTW - saved img in vrimg, then converted to exr. Opened in PS with fnord proexr - it doesn't like vraymtlselect channels at all. They were all black

[DaForce]

This is what I get, of course this is not straight from max. This is a mix of five channel in post, to add glow.

hahah hey, you might want to click your link and see what picture you actually get.
You may want to kill that link.
NSFW

[Paul Oblomov]

OMG
That's not me

[RErender]

Oh man, I just almost got fired, hmm still might, not sure who saw that.


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