CGTalk - comp fluids

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pbarnes

06-23-2007, 04:07 PM

i want to composite a flame onto a pic at first for testing then onto a video

i have made my fire and rendered with alpha channel in software render with maya

i take this into PS and i get 1 of 2 things happening hen i try to select the alpha channel to leave the flame
1) it says no pixels were more than 50% and it doens nothing
or
2)it just does like 2 pixes which is no good

there is an alpha channel there but parts of the flame are translucent so i think it gets stuck there with the varing shades of grey

any ideas

thx

mathix

06-24-2007, 01:32 AM

I've never used PS for compositing fluids, but in other comping software there were no problems. You may try creating your alpha based on luminance (just desaturate) - it will work for fire or simply use different blending modes (screen).

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