The most obvious perf checks ever:
gears iso-sm iso-flat m3d-sm m3d-flt
3.4 64.2 14.9 19.0 21.7 23.9
cvs 63.3 14.9 18.2 21.3 23.8
so, as it stands there is a slowdown with flatshading but it's not huge, the
worst example being isosurf at 4.5%.
I'd still prefer to put a little effort into optimizing that case rather than
change the interfaces at this point.
Keith
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