Graphics Optimization

post_01.txt

Optimizing intersection algorithms is crucial for high-performance path tracing. In this post, I explore the slab method for AABB intersection.

The Concept

The slab method works by treating the box as the intersection of three pairs of parallel planes.

// CUDA Implementation
__device__ bool intersect(const Ray& r, const AABB& box) {
    float tmin = -1e20, tmax = 1e20;
    // ... optimization logic here ...
    return tmax > tmin;
}
                        

Benchmarks

Using the optimized approach, frame times dropped from 16ms to 12ms on an RTX 3060.

"Premature optimization is the root of all evil, but this one was worth it."