I wanted to display a plane composed of 8x8 adjacent textured squares. I
was surprised to see the performance - about 20 fps (only 64 textured
quads there, no lights) !!!
I've checked the program - turned out the texture, same problem. Then I
discovered that by mistake I have not places squares in correct places -
they are 16x16 units wide and I placed them in 1 distance instead of 16
distance. This meant that they overlapped a lot. When I corrected this,
fps jumped up to 100+fps.
This solved my problem, but I would like to know what happened ? Is
drawing polygons in same position really so bad ? Or was that just the
problem of fill rate (every square took entire screen, so I suppose that
it could be redrawn 64 times) ? But shouldn't graphic card detect that
this area was already painted ?
Artur
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