I sometimes prefer to make an image sequence of the avi footage so I know the frames are loading correctly that I'm comping over.
If I'm going to any extra post work on the composite I will render as passes, if the composite is all I need when I look at the test renders in Lightwave I'll render to final sequence from there and tweek a little bit of gamma in post (very rarely happens though)
So I would render out your animation files (the stuff you're putting over the video) OVER the bg image seq BUT make sure that the background isn't going to be part of the alpha channel, this way you will render all the objects out antialiased to the background and not to black, which can give you some fringing in the alpha channel that you don't want when you're compositing images over the original footage.
*Sprite edger can help with this though in nthe image filter pulgins area)
Onve you've done that, you can then take the video footage, and the respective lightwave render passes, and composite them over the top of the footage in your chosen application, adding grain, blurs, fogs, dof, etc etc if you have done it all correctly :)
TGA is a solid format but does not contain any ZBuffer information
Extended RLA does export ZBuffer information for things like DOF / FOG if the comping app supports it.
Cheers
Kryp
PS the reason to say away from AVI is that you won't get any alpha channels to composite with. Stick to image sequences you know contain an 8bit alpha or the Zbuffer if needed.
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by: barryworksPosted on 2003-01-21 at 11:18:29ID: 7773076
firstly, i am not really expert in lightwave
but i have a little bit exp. in your question
both the way u mention i will not do,
the way i do is firstly import the video footage into lightwave just for compositing, i.e. camera matching
after everything fine, just render the images with alpha channel as sequences such as test0001.tga...
then i import those sequences into premiere/AE
just tweak with two layers in the editing program
that's it
sorry for my bad english!!^^