On Sun, May 16, 2010 at 4:53 PM, Christopher Wright <[email protected]>wrote:
> In this composition, the object on the left is static, while the object on > the right "wiggles". Does this happen for others, in Snow Leopard? > > It looks as though the shadow option on the Lighting Environment stops the > vertex distortion on the GLSL patch. I would expect both objects to > "wiggle". > > > This is a known issue (I griped about it in my pre-apple days, if I recall > correctly). Ahh yes, here it is: > http://lists.apple.com/archives/Quartzcomposer-dev/2009/Sep/msg00062.html > > cwright once said: > "I believe they use a custom GLSL shader (to map screen-space pixels to > shadowmap space pixels). You can see artifacts of this when you deform > geometry with the GLSL shader -- your deformed (unshadowed) mesh will render > as expected, but the shadow on the deformed mesh will display where the > original grid was." > > I remembered that bug (and also the aspect of GLSL optimization that made the object pop off screen if the grid was offscreen but the distorted vertices should be "on screen"), but thought this was a different problem. I never noted that continuing to manipulate the vertex distortion didn't result in a continuous distortion/change. It seems like shadows falling in the wrong place is different than the Interpolate/GLSL Vertex not animating when shadows are on, though they may be caused by the same issue. -George Toledo
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