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Black neon lights and muzzle flashes

Posted: Sun, 11th Jan 2009, 8:00pm

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FX Stopmotion CGI Films

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I am doing an effect which is sort of a black hole and am using a free hand neon light. The problem is a i can't make it black because it sets it as transparent and even if i can change the colour balance to 0,0,0 it still transparent. Even muzzle flashes and lasers do the same - it seems to not go transparent with black partilces though.

How can i can my black neon light?
Posted: Sun, 11th Jan 2009, 8:14pm

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Axeman

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Since neons, muzzle flashes, and lasers are by definition lighting effects, the composite blend mode is set by default to Add (or Screen, I can't recall exactly which). Both of these create transparency with darker colors, to create more realistic lighting effects. You'll probably want to change the composite blend mode to Multiply for a black hole, or possibly to Normal.
Posted: Sun, 11th Jan 2009, 8:26pm

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FX Stopmotion CGI Films

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Thank you so much that is very helpful
I've never know what that tab does
Could you possibly tell me what each type of compsite does?

Thanks
Posted: Sun, 11th Jan 2009, 9:24pm

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Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

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I'f you want the specifics of how each one actually works, check out this article in wikipedia. All blend modes are based on a mathematical process of how the RGB oclor values for the layer you are working with are combined with the layers below it. Multiply and Add are fairly self-explanatory. That link gives the actual algorithms for each blend mode. There are additional modes explained ont aht page as well, that are more likely to be found in image editing software than video software.
Posted: Mon, 12th Jan 2009, 4:26pm

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FX Stopmotion CGI Films

Force: 362 | Joined: 29th Nov 2008 | Posts: 70

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Thanks that was very helpful smile