Cuastic alpha?

[ro1208]

hi~
i've a question for if vray can store "Caustic aplphs" sepraately?...if it is ,how to make it?..thx in advanced...

rock
-Best Regard-

[egz]

I'm not quite sure what you mean here.

VRay can save and reuse photon maps that generate caustics, but you might be asking about something else.

[kskzksz]

Hi all~
what my friend means is to just store "caustic alpha channel" separated from whole image....like the "Render to Elements" of function in MAX to store specify info....
if it's not,whether if some tips to do the same?....THX~

[winberg]

One way to seperate out the Caustics would be to render one image with the caustics and one without. Then you can place them in seperate layers in photoshop and make the topmost layer in "difference" mode..

I use this often to seperate out the shadows..(I think the "matte" properties in Vray makes my renders very slow is this normal?)

-Tom

[egz]

Tom: The matte material used to be very slow in older builds because it used direct computation. In the later builds I've not noticed that the matte material is any slow at all. I tend to use mattes all the time now so that I can customize the BG in photoshop and still get shadows.