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August 17th, 2006
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#1 (permalink) |
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Moderator
Join Date: Dec 2004
Location: Salt Lake City, Utah
Age: 30
Posts: 1,198
Name: Tim Saunders    |
RPC and Matte/Shadow material.
I posted this in the viz forum as well.
I am working on a scene that has hundreds and hundreds of flowers and I have had to resort to using RPC. I want to render the rpc's in a separate pass and composite the plants in photoshop. So here is what I have tried so far. I render the scene without plants as one image. Then I assign a matte/shadow material to everything in the scene except for the rpc's (so I can have walls and fences subtracted from the rpc rendering). That cuts out the objects in front of the plants, but it doesn't save any alpha information. I have even tried rendering a shadow pass, but the image it renders is completely black. Anyone know a way around this? |
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August 17th, 2006
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#3 (permalink) |
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Moderator
Join Date: Dec 2004
Location: Salt Lake City, Utah
Age: 30
Posts: 1,198
Name: Tim Saunders |
Re: RPC and Matte/Shadow material.
Ya, I tried that, but the alpha channel it generates includes the rpc's as well. Here is the test scene I am working with. The first image is the end result I want, but I rendered everything together. The actual scene I want to use the method to composit with will have tons more planting - hence the reason for trying to figure it out. the second image is what I render with the matte/shadow material applied to everything except the rpc's. that is exactly what I want, but I just can't seem to figure out how to composite that into my base rendering which is the 3rd image.
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August 17th, 2006
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#4 (permalink) |
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Veteran Member
Join Date: Jan 2003
Location: Savannah, GA
Posts: 1,448
Name: Chad Warner |
Re: RPC and Matte/Shadow material.
I'm guessing that you are saving the matte/shadow image in a tga or tif format? If you have it set up right, the only alpha channel info you should have is that of the RPC's.
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August 17th, 2006
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#6 (permalink) |
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Veteran Member
Join Date: Jan 2003
Location: Savannah, GA
Posts: 1,448
Name: Chad Warner |
Re: RPC and Matte/Shadow material.
If you are using Vray, you have to set the objects to be "matte" under the vray properties box, or use a VrayMtlwrapper and do the same thing there. The settings are different than the matte/shadow material though.
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June 14th, 2007
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#7 (permalink) |
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Junior Member
Join Date: Jun 2007
Location: tunisia
Posts: 1
Name: ahmed boubou  |
RPC and Matte/Shadow material.
HI
hum, i still have the same problem I 'm trying to make a default scanline render pass (tga format) For my RPC elements with Their shadows, using matte/shadow for the rest of the scene, the shadow did not appear...  i think ther is a problem with Rpc Shadow plugins and the Matte shadow material... hope that i'm wrong.....  |
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July 3rd, 2007
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#9 (permalink) |
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Veteran Member
Join Date: Jan 2005
Location: Brisbane
Age: 34
Posts: 1,367
Name: Justin Hunt  |
Re: RPC and Matte/Shadow material.
Also RPC's work better with Scanline.
As a tip with RPC's, load the RPC into the material editor, turn off the self illumination and change the shader type to Oren-neylar blinn. Then you can dial down the diffuse level to darken the RPC's further. If you use Mentalray then you can drop an AO shader into the diffuse level slot, which will give a nice "grounding" feel the the plants. JHV |
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