## SLG cfg parameters?

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### SLG cfg parameters?

Hi, I have looked around the wiki, but I could not find an explanation of the parameters of the cfg file for SLG.

I wish to know the settings and the changes that can be done to them to find what can fit better my card(For example, is METROPOLIS the only supported sampler? Are there other choices?). Is there some documentation about them, please? (The cfg file is created by Reality)

And... is it normal that SLG 2.0 is slower than 1.8? On my Radeon 6950 FLEX I got 6763K from 1.8 and 4507K from 2.0(PathGPU2 used).

MCMXC

Posts: 52
Joined: Fri Nov 04, 2011 12:32 pm
Location: Italy

### Re: SLG cfg parameters?

Here is the wiki entry, its pretty basic though

http://www.luxrender.net/wiki/SLG_SDL

moure

Posts: 410
Joined: Sun Sep 26, 2010 4:32 am
Location: Greece

### Re: SLG cfg parameters?

MCMXC wrote:And... is it normal that SLG 2.0 is slower than 1.8? On my Radeon 6950 FLEX I got 6763K from 1.8 and 4507K from 2.0(PathGPU2 used).

You are probably comparing apples and oranges: you are probably comparing SLG 1.8 INLINED_RANDOM sampler with SLG 2.0 METROPOLIS sampler. Try to switch SGL2 to INLINED_RANDOM too:

Code: Select all
path.sampler.type = INLINED_RANDOM

METROPOLIS sampler is slower but it generates less noise. Choosing between one or the other is related to how complex the scene is.

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### Re: SLG cfg parameters?

moure wrote:Here is the wiki entry, its pretty basic though

http://www.luxrender.net/wiki/SLG_SDL

Yes, that was one of the wikis I took a look, and was really basic:( No good at all:(

Dade wrote:you are probably comparing SLG 1.8 INLINED_RANDOM sampler with SLG 2.0 METROPOLIS sampler.

Uhmmm... I made my test using the same cfg for both versions, and in both cases the sampler was METROPOLIS...

...but this answered to my previous question "Are there other samplers?", thanks:)

MCMXC

Posts: 52
Joined: Fri Nov 04, 2011 12:32 pm
Location: Italy

### Re: SLG cfg parameters?

MCMXC wrote:Uhmmm... I made my test using the same cfg for both versions, and in both cases the sampler was METROPOLIS...

The parameter used to define the kind of sampler has no meaning for SLG 1.8 and it is ignored. SLG 1.8 supports only one type of sampler, the one called INLINED_RANDOM in SLG 2.0.

Dade wrote:...but this answered to my previous question "Are there other samplers?", thanks:)

Yes: http://src.luxrender.net/luxrays/file/5 ... pes.h#l114

INLINED_RANDOM, RANDOM, STRATIFIED, METROPOLIS

The interesting one are INLINED_RANDOM and METROPOLIS.

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### Re: SLG cfg parameters?

Thank you so much:)

MCMXC

Posts: 52
Joined: Fri Nov 04, 2011 12:32 pm
Location: Italy

### Re: SLG cfg parameters?

...can be possible in the future to have a LowDiscrepancy too? That's because in my pictures gives me the best results...

MCMXC

Posts: 52
Joined: Fri Nov 04, 2011 12:32 pm
Location: Italy