From: K. Chugh (chugh++at++buffalo.edu)
Date: 11/04/2002 12:47:00
hi paolo- thanks for your reply:
> A requirement is that the texture used for rendering a gset must provide
> coverage for the entire gset geometry (in texture space).
> Depending on clipcenter positioning and on the texture space bounds,
> an appropriate texture level is automatically selected on each frame
> for each gset.
i thought i was doing this, but let me run the numbers by you. i've got
a relatively small cliptexture-
level 0 - 4096, tile size is 128
level 1 - 2048, tile size is 128
level 2 - 1024, tile size is 128
level 3 - 512, same as clipsize , so no levels
...
level n ... same
i've divided a big square into 10 x 10, and 100 x 100 tiles (each a
geoset) and i can still only see the 512 non-tiled texture level and
coarser.
so, are you saying the entire geoset must be able to fit into one
texture level? suppose i've taken a 1000 x 1000 square and divided it
up into 100 x 100 tiles, each of which is in a geoset,and are using the
entire texture from s=0 to s=1 (so each tile uses .1 of the texture). if
you look at the square (geometry, not texture) at 1,1 (starting with 0)
shouldn't that geoset that goes from s=.1 to s=.2 (same for t) in
texture be able to fit into the 1024 level, since each texture tile is
128 which is 128/1024 =.125 in normalized texels in width? this doesn't
work, but i suspect i'm misunderstanding the geoset size requirements
w.r.t. the geoset size. can you clarify using this example (if it's
clear enough)? thanks again for your help.
kevin
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