title: What's the point of sampling multiple rays per pixel
body: <p>What is the purpose of multisampled pixels in raytracing? In my experience writing raytracers, there is never any noise, only slight aliasing at lower resolutions, but in most diagrams I see, in the single sampled pixels, there is a ton of noise and black spots. Is this issue noise on single pixels exclusive to global illumination/antialiasing? Or is there another benefit to using multiple samples per pixel?</p>