3d functions like scatter() that uses "c" and "cmap" apparently used to display without alpha-modifications to create a depth perception. A recent bugfix for a related issue now causes all scatter points to display with alpha-induced depth perception (I really need a better name for this effect....). It was not intended that alphas were disabled before, however, some felt that was a useful feature.

Therefore, a feature request is to add a way to indicate that depth perception effects should be disabled.