MIP_Matteshadow / Use Background Problem

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  12 December 2012
MIP_Matteshadow / Use Background Problem


I'm working on a matchmoving scene in Maya 2013. The matchmoving itself is already done and now i'm doing some r&d (especially rendering).

There is a problem with the scene geometry and the shadows. As I need to turn of the "cast shadow" attribute, the shadows from the other objects pass through the scene geometry causing shadows on other objects. Is there any possibility to manage this?
I tried both, "Use Background" and "MIP_Matteshadow" Shader. The problem exists with both shaders.

  01 January 2013
Anyone? :/
  01 January 2013
I believe this is the same problem I ran into a while back. I think this is an issue with the way mental ray computes shadows or something...order of operations thing. It's foggy now, been a while but I think I brought it up to Zap and his answer was something along those lines. But the long and short is I think this is the way it works. In order to do other awesome things this is a side effect. May be some workaround solution but I didn't come up with a good one I don't think. Might have rotoed the unwanted stuff out. It does suck though.


Re-read your post. Not sure my issue was the same as this. I did not turn off cast shadows on my geo. I had some sort of shadow pass through problem though..but it was strictly related to mip matte shadow and the order of operations of shadow computation in mr...or something like that.
If animation is the illusion of life, then life is the illusion of reality.

"On ne sort pas DU REVE."

Last edited by Redsand1080 : 01 January 2013 at 03:08 PM.
  01 January 2013
I've had this problem before. I found the work around was by using the MIP_Matteshadow, but with having the render stat "cast shadow" ticked on and changing the shadow method to segments in the quality tab of the mental ray render globals.
  01 January 2013
Thank you very much for the answers!

DavidMcGowan, your solution works perfect, thank you

Redsand1080, your description maked total sense to me. The shadow method may has something to do with the order of calculation.

Best regards,
  01 January 2013
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