Graphic Cards Any such thing as a +ve LOD bias?

S

saumilsingh

Forerunner
GTR exhibits heavy shimmering on nVidia hardware and clamping the -ve lod does nothing to fix it.
LFS does this too but the clamp fixes it here and there's an ingame option to control the lod bias which works just as well.

Anyway to force the lod bias at above 0 in the +ve range?
Hope that was clear enough, maybe chaos or someone knows...
 
LOD = level of detail. As something moves further away from you in-game, its image quality changes. A negative value of LOD implies that the further away an object is, the lower its quality. This is done to improve performance in games. Ofcourse, the concept of negative lod is rather stupid in racing games cos most of the time you will be looking at the horizon and not the patch of ground right in front of you.

also 'define:lod' in google.
 
Nikhil said:
what is LOD?? Can someone please explain??
Click to expand...
goof grease monk...

Its actually based on a correct theory that we focus on closer objects and notice any anomalies in then sooner (visually speaking). As an object gets far from our LOS we pay less attention to it (which is why snipers shoot presidents from 3 blocks away):P and therefore are less likely to notice any visual discrepancies.

In games 3D textures are continuously swapped so as we come closer to an object its LOD increases (basically a higher res mesh/map is replacing the lower res/detail one) until it looks very realistic from close. when we move away similarly the reverse happens because we're close to other objects....

This is done to conserve 3D rendering power and ofcourse to add realism. Farcry demonstrates this best.
but in racing games (grease monk on target again) this is reversed...or rather should be reversed.
 
What Grease said is related to 3D meshes. To save performance, the modeller makes seperate versions of a particular mesh with varying 'Levels Of Detail' to be displayed at different distances.

What I was talking about is nVidias' poor texture LOD handling. Some games use a negative LOD bias to make textures appear sharper at the cost of shimering when in motion.
Tried RivaTuner... didn't fix it. Even 8xS AA doesn't remove it entirely.
It's really bad in GTR, the track chalk lines appear all chopped up and then start crawling as I apply throttle. Will try to get a screenshot...
 
Tried High Quality mode (which turns off all optimizations) with LOD bias set to 3 and still nothing.
Here's just how bad it can get - First corner at Barcelona, notice what happens to the chalklines and grandstands as they move further up away (chop chop). It's even worse in motion.



Interestingly this is a TWIMTBP title lol.
 
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