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Crop camera based on object bounding box

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Hi all,

I'm trying to find a way to use the bounding box of an object to dynamically drive the cropping parameters of my camera. I'd like to render only the region (and frame range) that an object appears in the frustum, will have to figure out motion blur after. 

I have the world space coords and the bounding box min/max, and I'm struggling to find the best way to translate that to 2D coords. I know toNdc should pass me back the 0,1 coords but I'm not sure how to use it correctly.

Any help or advice on where to start would be much appreciated.



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