[Marc Thomas] “how to make the shadows “2.5D”? “
Apologies if I’m needlessly overcomplicating this — unless the effect is very, very slow, I doubt that any viewer would ever notice. Just for clarity, what I was referring by 2.5D is this:
After Effects doesn’t think in true 3D; everything in After Effects is two-and-a-half dimensional. You can position a 2D layer anywhere in 3D space and rotate it in 3 dimensions, but everything AE works with is a flat plane with no depth, like a sheet of paper or a playing card.
When it shatters something, CC Pixel Polly gives the illusion of three dimensions, but as you swing the camera around, you see that it’s really a flat plane that exists in 3D space. This is the “2.5D” I was referring to.
In this case, if you precomp everything, you can position the precomp in 3D space, and you can have it cast shadows, but it will be a 2D plane in 3D space that’s casting the shadow; particles will not cast shadows on each other, and there will be no difference between the shadow from a “foreground” particle and a “background” particle, because to AE, there is no difference in Z-depth.
I’ll also note that some effects like Shatter and many of the Trapcode plugins work around this 2.5D limitation by rendering a 3D perspective within their 2D layer of what the composition’s camera would see in a true 3D environment.
Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
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