I don't know how to increase the mesh resolution in RDS, but in Carrara you select all polygons (or just those you want to subdivide) and hit "Multi-res subdivide". Then you export as obj file to UVMapper and use planar mapping. The trick there is to reproduce the edge-polygon-stretching that Zygote or Daz used for the original mapping, or the texture will be applied in a grossly distorted manner in some areas. That is something UVMapper doesn't do by default, and the Mac OS version can't do it at all - it can only do the default (perspective mapping), where all the edge polygons are shrunk in the perspective direction. So I'm hoping Steve will be able to produce a Mac version of UVMapper Pro.