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Rednering shadows for AE lights on transparency

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Mike ThrockRednering shadows for AE lights on transparency
by on Oct 21, 2010 at 7:23:49 pm

I've got some 3d objects casting shadows onto a white solid set to multiply, which catches the shadows. All of this is on top of a video layer.

How do I render these out with transparency? When I turn off the video layer under the white solid, the transfer mode turns the solid back to white, and no transparency is present.


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Michael SzalapskiRe: Rednering shadows for AE lights on transparency
by on Oct 21, 2010 at 7:32:25 pm

Are you planning to use this in an NLE or just as a precomp in AE?

If you're staying in AE and you put it in a precomp and enable the continuous rasterization switch, everything should work for you just fine.

- The Great Szalam
(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')

No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.


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Mike ThrockRe: Rednering shadows for AE lights on transparency
by on Oct 21, 2010 at 7:57:28 pm

No, it's a graphic that needs to be able to be used in an editor.

Can this even be done?


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Mike ThrockRe: Rednering shadows for AE lights on transparency
by on Oct 21, 2010 at 8:21:00 pm

That was a pretty intense post, but I found the response that seems to work.

Using the channel combiner, but because I'm using a white solid instead of black, set "FROM" to MIN RGB and "TO" to Alpha. Then Invert.

Thanks for the link,


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