CGTalk - Clip map ?

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NNois

01-18-2005, 02:46 PM

Hi !
We are transistionning from Lightwave to XSI. Does anyone know how to archieve in XSI a "clip map" ala lightwave ?
A better explanation : a clip map is a 2 bit image ( black or white ) who act like a transparency map, but in addition act as a "cut" object feature, in result for example, ray don't hit the surface of the polygon who is "cutted" we can make like that a tree with leaves (mapped and clipped mapped) who cast shadows with a shadow map.

Thanks in advance and sorry for my crappy english...

MitchVFX

01-18-2005, 03:11 PM

I'm still a newbie myself, but I believe you use the Sprite node in the render tree to accomplish this.

RuiFeliciano

01-18-2005, 10:07 PM

Yep, just use the SPRITE node under the Raytracing menu in the rendertree.

LuKa

01-19-2005, 04:04 PM

Just out of curiosity, where do you plug this sprite node?

bravmm

01-19-2005, 04:31 PM

plug material into sprite's input, plug b/w image into sprite's matte. Turn on matte in Sptite's ppg. Get sprite with node>raytracing>sprite.

Hope this helps,

rob

p.s. to NNois, also have a look at the mixer nodes. You can do lots of stuff with b/w images etc. too.

NNois

01-19-2005, 10:04 PM

Thanks for your replys ! it's all working...

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