Damn, i nearly fell off my chair, this is really impressive stuff. Ive always wanted the pens to be a little more "alive".
Whats the performance hit like (if any)??
+have you concidered adding shadows?? (the sh3 original used a lightmap which looked pretty cool).
I think interiors this detailed would really benefit from some shadowy goodness + It has virtually no fps impact so long as you dont go crazy with it and add 100s of lightmap textures

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