I was wondering if there are any existing engines that are specifically set up for testing different combinations of rendering methods on the fly. I know there are a lot that let you switch from say, software to D3D. I was wondering if there are any that let change on a more detailed level, like different stages in the pipeline to be done by Dx or your own software routine. If not, could anyone recommend an open source engine that is the easiest to plug in your own routines on a piece by piece basis? Thanks for any help. "things are more like they are now than they ever have been"