how to export an openGL scene with alpha channel?

    Feb 07 2008 | 11:33 pm
    hello list !! i have a problem: I have a openGL patch wich render a bunch of particles; I am exporting this openGL scene in "animation" .mov format, and what i want to do is to export the background with the alpha channel. I know the "animation" compression can have the alpha channel, but from the openGL renderer i have no clue of how to set the alpha value of the background to 100%. The erase_color have the argb, but when i put rgb values to 0 end the alpha value to 1 the background is black and the exported .mov file doesnt seems to have any alpha channel. any hint??
    ps. to render and export my patch I m using the (fantastic!!) render node by Randy Jones - but the process would be the same also without it..
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    Mattia Casalegno ++393332152448 ____________________________