How do I export a Poser animation file without GROUND as an Alpha channel for use in Cinema4D or 3DS Max?

Have you tried simply making an animation of sequentially numbered tif files with no background? That should give you your alpha channel and I don't remember the ground ever rendering, however there are settings (perhaps under View) that allow you to shut off things like the groundplane and groundplane shadows (which are different than rendered shadows. You then just import the sequence of files into your next application which will create the animation. You may have to invert the alpha during import. I know the Avid needs that box checked for the alpha channel to come in properly for some reason.

HTH

 
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I don't think this is directly possible (but the export options of Poser might allow this - possibly).  For one thing, the scene animation is 3D and Alpha channels are 2D.  This means that the only appropriate export involves the camera (and a 2D rendering of the animation) as you end up with a 2D representation of the 3D scene this way - comprende?

One possible solution that is very easy is to do this:

1. Hide the Ground plane (you can do this in Poser)

2. Set all of the materials of the animated objects to a flat color that differs from the background color complimentarily (by flat, I mean no specular, no highlights and by 'compliment' I mean the opposite color (black/white, red/green, blue/yellow) - something that is easily separable - think blue or green screen here).

3. Render as either animated image sequence or animation.  Although I have Cinema 4D, I'm not certain of how it handles animation in materials.  It may allow image sequences or it may only allow animation formats (e.g.: avi, mov).

What you should end up with is an animation that is basically two colors (background and animated objects).  You can then use that as an Alpha channel.