Can Cycles be coaxed to cast more rays in pixels containing a large gradient/discontinuity in depth (or high contrast in brightness)?
My scene is fairly simple (effectively an image mapped to a sphere as an emisive material). Rendering with a small number of samples (eg 5) produces good results for the surface, however the edge of the sphere is jagged/noisy. Increasing the the sample count to 30 cleans up the edge but greatly increases the render time.
Cycles is a requirement since I need equirectangular rendered images.