Make the backround transparant?

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# 1 09-08-2007 , 04:59 PM

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I have an AVI animation of my render. Problem is, it's backround is black. I want to make it transparant so I can overlay another clip over it.

How do I do that? I heard something about a backround shader..but..?

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Last edited by dont_be_ss; 09-08-2007 at 05:16 PM.

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# 2 09-08-2007 , 05:16 PM

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you shouldnt export as an AVI, render it out as a TGA image sequence. that will automatically make the background transparent.

Environment Artist @ Plastic Piranha
www.joopson.com

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# 3 09-08-2007 , 05:46 PM

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Originally posted by Joopson
you shouldnt export as an AVI, render it out as a TGA image sequence. that will automatically make the background transparent.

Originally Posted by

I did..

I did all the image sequances as TGA. Then I imported each file to Videomach. Then etc...

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# 4 09-08-2007 , 06:19 PM

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that should work when you try to overlay it...

Environment Artist @ Plastic Piranha
www.joopson.com

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# 5 10-08-2007 , 02:21 AM

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Ive never used video mach but does it support alphas? Just that you will need to have a programme that supports it.

also did you render it with the alpha channel?

"No pressure, no diamonds" Thomas Carlyle

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# 6 10-08-2007 , 03:21 AM

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Originally posted by gster123
Ive never used video mach but does it support alphas? Just that you will need to have a programme that supports it.

also did you render it with the alpha channel?

Originally Posted by

Nope, I didn't use the alpha. And yeh, it does support. Video mach is really, worked like a charm and very quickly user added image

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# 7 10-08-2007 , 03:22 AM

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Hold on, I don't think I rendered as TGA...I'll re-do and see what happens -.-

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# 8 10-08-2007 , 04:02 AM

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ALso if you render in mental ray you have to turn on alpha channels in the renderoptions it's under custom passes(or something like that) user added image