Hi Stiglr,
'Counting Polygons' can be a funny business. Ac3d counts 'surfaces as best I can understand. Create an ellipse in Ac3d, set surface to poly ... then check model info ... 1 surface. Now set it to one-sided .... still one surface.
However, that surface in fact will show up as a number of triangles in vrml and setting it to single sided ... halves the number of triangles being drawn in a vrml viewer. It may very well be that different game/sim engines behave differently ... so understanding where your 3d will end up is very important.
The comment about *single-sided* applies to solid objects (closed *and* no transparency). If you looking at lets say a glass cockpit or a wineglass then you probably can not use this trick. On the otherhand .... a set of goggles on pilot's face .... glass probably can be one sided
Understanding where 3d will end up and how it is viewed is important ... always think a little before you create.
Regards,
griff
