Iterator with tmin/tmax and ray shortening about bvh HOT 4 OPEN

Is this a dup of #56?

from bvh.

Is this a dup of #56?

I don't believe so. #56 asks for "what is the closest object/s in the BVH to arbitrary points".

This request is mostly for adding ray shortening to the traversal. It could look something like:

let iter = bvh.traverse_iterator(ray)
for shape in iter {
    let hitinfo = do_full_intersection(ray, shape);
    if hitinfo.hit {
        iter.shorten_ray(hitinfo.t);
    }
}

from bvh.

I gave this some thought. I think the only way to safely do this is to pass an Rc<RefCell<Ray>> to the iterator, which adds a lot of overhead during traversal. And computing t per box is also extra cycles. So unless we add unsafe code (not a fan) or can think of another approach this is probably not worth it. Some form of SIMD is probably still the best option for perf gain.

from bvh.

And computing t per box is also extra cycles

That's not really true, the slab method computes t anyway.

from bvh.