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# 1 17-02-2008 , 12:36 AM
InverseTelecine's Avatar
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Join Date: Feb 2008
Posts: 22

"Subtraction models"?

Hi everybody. Total newbie here. I just joined and this is a great site!

Anyway, what I want to do is create a polygon or NURB model that will make any other model it intersects or passes in front of invisible.

I'm trying to make Maya footage to composite with live action footage, and I want to make a model of a spear/arrow/etc and have it stick in a filmed person. So I thought if I could make a rough approximation of the person's chest in Maya in 3D, then I could match the movement of the 3D chest with the live action footage of the person moving, and just link the spear model to that model. But I don't want the segments of the spear that should be inside the chest or on the other side of the chest to show.

Does anyone understand what I'm trying to say? My apologies if this has been asked a thousand times before. I've tried searching this forum and the internet, but I really don't know how I should phrase my searches, so I haven't had any luck.

Thanks.

Edit: The chest model itself also needs to be invisible. I feel stupid for forgetting to say this up front.


Last edited by InverseTelecine; 17-02-2008 at 03:51 AM.