I assume RT is Nvidia proprietary and N is ATI from what I have read (please correct me if I am wrong) but I have no clue what they are, what they do, etc. What are these? Thanks a ton!
N-Patch tesselation is the real name for ATI's truform. What it does basically is create a curved surface by taking a flat triangle curving it and then making it into lots of smaller triangles. So you put one triangle into the GPU and out pops a curved surface made up of lots more triangles then were sent in. So games that look blocky because of low poly counts can be made to look much smoother via N-patch tesselation.
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