> 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."
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