"* you have tree density to 0.7 in the shots, I had it at 2.4 - since
there's lots of trees in the scene (it's tropical forest), that would be
expected to have an impact"
Yes the vegetation has a huge impact, i experienced from 0;7 to 2.5 the
fps decrease is 40 %, with or without Rembrandt.
The clouds density is right now less sensitive, only the visibility range
as an impact ( however, because of the eye candy we are using the maximum ).
Two GPU embedded should not be an issue, though our system manager did not
noticed any significative improvement with the SLI architecture with FG ,
but it cant get some comparison since, with it, the display is supposed to
be divided (AFS or SFR).
It would be interesting to know how these two GPU are working together.
Ahmad
On 17 June 2013 08:20, Renk Thorsten <thorsten.i.r...@jyu.fi> wrote:
> > It could help you to understand why you are getting that poor
> > performances
> > with your pretty fast beast GTX 670M.
>
> Thanks, though I remain mystified.
>
> There are few differences I can spot:
>
> * you have tree density to 0.7 in the shots, I had it at 2.4 - since
> there's lots of trees in the scene (it's tropical forest), that would be
> expected to have an impact
>
> * you have cloud density set to 0.4 whereas I have set it to 1, and also
> in vaguely remember seeing a bit more clouds
>
> * you have dds textures used, I have used the regional set - my
> understanding was that this should affect texture loading times and
> available resolution, but not really runtime performance, but this needs to
> be checked
>
> -> So I have 4 times the number of trees in the scene and 2-3 times the
> number of cloud sprites. I'm not completely sure how Rembrandt manages
> trees, but it could be that since they're semi-transparent they're like the
> clouds taken out of the deferred rendering approach. Multiple cloud sprites
> in a row are a significant drain on both vertex and fragment shaders as you
> may need hundreds of texture lookups - so the available performance for
> Rembrandt-specific tasks isn't quite the same.
>
> My gut feeling is that this can't account for a factor 4 in framerate
> though, especially since there is still the pixel number working the
> opposite way this time - I will have to test this.
>
> In addition there's the question of having two GPUs. I wonder if they're
> both utilized for the job - if so, maybe one needs such a setup to get
> above 30 fps with shadows? It would be helpful if a few other Rembrandt
> users could give some indication of what framerates they usually get and
> what the main framerate killers are.
>
> * Thorsten
>
>
>
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