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Old 07-20-2013, 03:34 PM   #1
Amarnath Murugan
chennai, India
Join Date: Dec 2012
Posts: 14
Unhappy 3ds max compositing help

Hello guys,
I have had this question for a long time and and dying to find how to do this effect

in the beginning of the video we can see the golden rings coming out of the table from a real footage , how to do that effect ??

In the above video , This effect is shown again , but how to make the model which covers the sword invisible along with the part of the sword behind it ????
Can someone explain me this effects or provide a tutorial for this please

Please forgive me for my bad english
Old 08-17-2013, 04:10 AM   #2
Bryan Ray
VFX Generalist
Los Angeles, USA
Join Date: Oct 2007
Posts: 133
I believe what you're asking about is matte objects: A piece of geometry that is not visible in the render but can still hide other pieces of geometry.

The renderer you're using should have a shader that performs this function. In V-Ray, you can assign the VRayMtlWrapper and check the "Matte surface" box. Play around with the Alpha contribution control to figure out what setting you need to get what you want in the alpha. For the effects you're looking at in those videos, you want this to be set to -1.0.

In Mental Ray, I think you need the Matte/Shadow/Reflection material. I'm not sure how to set it up, though, since I've never used MR in Max.

Likewise, I've never seriously used the default scanline renderer in Max, but there's a Matte/Shadow material there, too.

These shaders are also the ones you'd use to make an object that can catch a shadow or show a reflection without otherwise showing up in the render. For instance, you want your CG character to appear in a practical mirror in your footage, or you want the CG car to cast a shadow on the floor of the real garage.
Bryan Ray
Old 08-17-2013, 04:10 AM   #3
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