samplelevel hlsl 5.0

rouncer 104 Aug 26, 2012 at 17:01

ok, so when I use samplelevel at the 0th level it seems to go slower when i just use sample and autodetect the level. Is samplelevel slow? or is it only going slow because its checking the final level, where sample is picking off mips instead?

i think im right, just clear my mind, thanks.

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Reedbeta 167 Aug 27, 2012 at 01:50

Forcing things to a lower mip level can indeed make rendering slower since you’ll have more texture cache misses. But I would only expect that to happen when you’re far enough away from the texture that it wouldn’t use the lower mip level at all under standard sampling.

rouncer 104 Aug 27, 2012 at 08:18

I am far far away from the texture, its right in the sky looking at a water body - so yeh it comes up.
machine wise you kill me,thanks for the info.