How to recalculate axis-aligned bounding box after translate/rotate?

Question

When I first load my object I calculate the initial AABB with the max and min (x,y,z) points. But this is in object space and the object moves around the world and more impo

Answer 1

Why not use your GPU? Today I implimented a solution of this problem by rendening a couple of frames.

1. Temporary place your camera over the object, above it, pointing down at the object.
2. Render only your object, with out lights or anything.
3. Use orthographic projection too.
4. Then read the frame buffer. Rows and columns of black pixels means the model isn't there. Hit a white pixel - you hit one of the model AABB borders.

I know this isn't a solution for all the cases, but with some prior knowledge, this is very efficient.

For rendering off screen see here.