Quote - I do that for large armies. The trouble I have with that method is that the quality of the image gets messed up after a couple passes.

 

It shouldn't, as long as you keep everything the same (image size, rendering resolution, etc.). I save my renders out as tifs so that there's no compression and no degradation of the image. If you plan your image well, you shouldn't have to do it for more than three or four layers, anyway - but I have gone as high as six or seven.

-jjsemp