Product Chat / What is SAO and how does it affect DrawCalls ?

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UNIRD12B
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Posted: 1st May 2017 02:01
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Hi guys , im trying to get more FPS in my levels
and its seems that when SAO radius and Intensity are set to high
the DrawCalls increase by about 40% or more.
I tried looking closely at a textured wall to see if i could notice any difference
with it enabled or off fully ,but if there was , it was quite limited.
So maybe some more understanding of this function might help some of us
lesser ones get more FPS ....IF we don't need to use it at all.

Thx

UNIRD12B
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Belidos
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Posted: 1st May 2017 02:17 Edited at: 1st May 2017 10:44
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SAO is like the ambient occlusion generated in software, it's the small shadows around the edges and in corners. The reason it effects performance is because its dynamically generating those shadows , constantly adjusting depending on viewing angle and the angle of light sources.

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UNIRD12B
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Posted: 1st May 2017 02:50
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Thx Belidos ,
BUT....that..... is like telling me
E=mc2 is
Energy = mass times the speed of light squared

it maybe tells me what SAO stands for
but not a lot about how it can affect frame rates or what " ambient occlusion "
actually does....
for me "untrained "......ambient occlusion ....would occlude or stop or block the ambience
hence "kill the mood in a room ".

In other words....a bit more elaboration on the term would be of great help in understanding
its overall effect on the view and on the framerate.

Thx again tho for starting the responses.

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UNIRD12B
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Posted: 1st May 2017 02:53 Edited at: 1st May 2017 03:02
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And also...

WHY does it increase DrawCalls so aggressively ?


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perelect
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Posted: 1st May 2017 03:29
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https://www.youtube.com/watch?v=wWxsEOGESGg

A bit about SAO in this video
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UNIRD12B
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Posted: 1st May 2017 03:50
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Wow
Thank you Perelect ,
that was a great answer and complete and so easy to
follow and understand,,,well done.

so its Ambient Obcurance not Ambient Occlusion !

Now THAT makes a lot more sense in what it does and how it works.

thanks again !

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Preben
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Posted: 2nd May 2017 14:31 Edited at: 2nd May 2017 14:32
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Unfortunately SAO and other functions require a special depth buffer thats why you see a draw call increase.

Did you try the LAPTOP option from this thread ?

https://forum.game-guru.com/thread/217914

It should give you a nice fps boost

LAPTOP option is not just for LAPTOPs it can be used on all systems for a boost.
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m2design
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Posted: 3rd May 2017 00:17 Edited at: 3rd May 2017 00:44
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@Preben
I have tried the LAPTOP option on my desktop system (to get FPS increase) and got strange textures on a couple of custom model sloped roofs.
Could just be my models ...

They look almost like the retro textures (sort of but not quite).
I will try to get a screenshot later. The problem goes a way if I remark the define LAPTOP line.
EDIT
This is the way the roof of the building on the left should look


This shot is with the LAPTOP option activated.

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UNIRD12B
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Posted: 3rd May 2017 00:42
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THANK YOU
all for the great info on all this stuff..
really helpful.

UNIRD12B
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Preben
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Posted: 3rd May 2017 07:40
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m2design: https://forum.game-guru.com/thread/217914#msg2578044
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DVader
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Posted: 3rd May 2017 14:29
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Best to just drag that slicer to 0 if you want a better frame rate. It does actually make a fair difference to the overall look of things though and you will see a lot more hard lines along edges and corners of objects. As you have noticed, it is a bit of a performance hog, although it is faster now than it used to be.


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