On Jul 22, 2008, at 3:07 PM, Jens Alfke wrote:
When I implement this, I get the wrong results. It looks like the
pieces do get rotated, but then they're projected flat onto the
board layer, so when the board tilts back it's clear that it's still
flat but with distorted pieces drawn on it.
As far as I can tell I'm doing everything correctly. Now I'm worried
that there's some undocumented limitation in CA itself that prevents
a layer from lying in a different 3D plane than its superlayer. Is
that so? Any way to work around it?
It's unfortunate that this is undocumented, but it is the intended
behavior—layers are projected into their parent's plane when rendered.
This is because many of the features of the CA compositing model are
inherently 2D (filters, drop shadows, etc) so the only way to make
them work is for each layer to be a place in 3D space.
Typically the way one works around this is to make all layers that
have to live in the same 3D space be children of the same parent
layer, the one with the sublayerTransform defining the perspective and
viewing transform.
John
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