Peter Shirley's Ray Tracing In One Weekend implementation in Rust

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My implementation is about 30x slower than @cbiffle's :frowning: (90 secs vs 3 secs for the final image of RTTNW) . I have to figure out where I'm doing it wrong. I guess it is somewhere in the bvh implementation.

Edit: indeed there was an error in the axis-aligned bounding box hit function, now fixed. Now it is about 8 secs. There's still room for improvements for the bvh implementation.