 Modeling in XSI is very strong when working with polygons, while subdivision surfaces are more deeply integrated into XSI than other 3D packages. XSI's non-linear animation system sequences clips of animation, but also allows animators to blend and transition between different riggings, constraints, expressions, and externally referenced models. XSI comes with a seamlessly integrated copy of the mental ray renderer, and includes support for "render regions" which let artists drag a box over any part of any modeling window, and see a fully raytraced mental ray rendering of the corresponding part of the window, which updates as parameters are adjusted, such as moving a shadow when a light is moved, or updating with changes to the camera position or animation. XSI has excellent support for customized render passes, second only to Houdini's. XSI also includes an integrated compositing system.
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