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Old 09-21-2012, 03:49 PM   #1
cabtingraphic
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Ahmed Moh
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Vray matt shadow Issue

I try to render a moving object in a None moving environment so i render the environment in a pass and the moving objects in another pass. the problem happen when i render the moving objects. the matt objects cause a shadow problem as it don't prevent shadows.i attached images for more information.
Attached Images
File Type: jpg Render Final Compared.jpg (90.3 KB, 32 views)
File Type: jpg Fg Alpha.jpg (94.0 KB, 24 views)
File Type: jpg BG+FG.jpg (73.3 KB, 26 views)
 
Old 09-21-2012, 08:32 PM   #2
Frubes
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Mark Knowles
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If you want it to go back together correctly as you see it in your RGB you need to either render the shadows of the moving objects into the environment as well as the static shadow or composite your render elements back together.

To get just the environment, turn your animated objects visible off to the camera. They will still cast shadows and reflections onto your environment but the animated object will be invisible. Then, render a separate pass for the animated object as you have done already and just put it back over the top.

At the moment your two shadows are in essence separate, and therefore you are relying on compositing them through correction rather than letting the render combine them for you, hence why one is darker than the other.

Last edited by Frubes : 09-21-2012 at 08:36 PM.
 
Old 09-21-2012, 09:09 PM   #3
cabtingraphic
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Ahmed Moh
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thanks for replaying
i agree with you completely. the point is i bake the gi in the BG pass for fast render times so it won't work correct if animated objects in the BG pass even if not visible.
another thing i used the same method before in max 2011 and vray 1.5 rc5 and worked perfect
it was my main render way.that is why i think there is a soloution for this problem that can render the Animated objects pass with correct shadows.and also the shadow don't cast correct that mean there is something wrong.
 
Old 09-21-2012, 10:03 PM   #4
hypercube
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Daryl Bartley
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If you render out all your passes separately for both FG and BG you could have more control over recombining them in the comp. Merge the AO and shadow passes together on their own, masking, etc.

Also looks like your density and color are getting weird, because even the part of the shadow that's not doubled up, doesn't look right.

Maybe try the app specific forum?
 
Old 09-21-2012, 10:47 PM   #5
cabtingraphic
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Ahmed Moh
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the strange result just came out in this fast test. but normally the problem is in the double shadow area.i tried the vray forum and the area and i searched the web but no result.and as i said the problem is that this way is much faster and the less to work by than render out each pass (Diff reflection shadow )to fg alone and BG alone. and the old way was working perfect .but out of no where this problem came out.that is why I'm searching for a way to solve it.and i'm also looking if any one have the same problem????
 
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