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Dark Physics & Dark A.I. & Dark Dynamix / What exactly is accelerated on the GPU?

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Jase
19
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Joined: 8th Apr 2005
Location: England
Posted: 6th Sep 2008 16:47
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Gi,

Are softbodies and particles accelerated on the GPU? On the squashy nvidia logo demo, I get the same low framerate in both hardware and software mode. Drops to low teens on a quad core and 2x8800u;tras in sli.

MetalMackey
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Hoozer
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Joined: 8th Sep 2006
Location: Bremerhaven (Germany)
Posted: 6th Sep 2008 20:48 Edited at: 6th Sep 2008 20:50
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@ Jase: Lee told that mostly fluids and soft-bodies will be accelerated by hardware!

I would say the features get accelerated in this order:
- fluids
- soft-bodies
- cloth
- rigid-bodies / particles (particles are handled like rigid-bodies as Mike told me)

When I ran my demo and the old AGEIA-SDK-C++-demos in Hardware- and Software-Mode, I only saw a difference in the CPU-load in the Taskmanager, NOT in the FPS!

So you may only see a change in the load from CPU to GPU! (-> CPU has less to do than in Software-Mode!)


I hope this answered your questions! (This are only my experiences with DP!)

Hoozer

AMD64X24800+(939);2GB;GF6800LE (@12PS, 6VS; 380 MHz, RAM: 434 MHz)
DP-Sw-Mode-Comp-Entry (updated to V. 1.4):
http://forum.thegamecreators.com/?m=forum_view&t=109846&b=5&p=0
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BatVink
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Joined: 4th Apr 2003
Location: Gods own County, UK
Posted: 7th Sep 2008 00:15
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Everything gets offloaded to the GPU. The Physics simulation runs in parallel on the GPU, and you grab the data on each update.

Are you using the PHY UPDATE 0 / PHY UPDATE 1 method?

Like Hoozer says, the FPS may simply be the maximum you'll get. However, you'll be able to do a whole lot more in your program with no drop in frame rate.

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Jase
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Location: England
Posted: 7th Sep 2008 02:11
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I tried the flowing fluid demo just now on high. CPU dropped to 5fps and lower if I add more spheres. GPU is 36fps and gets higher the more spheres are added LOL.

I tried the 0/1 meathod on the softbodies demo, crashed in hardware mode and was the same fps as normal way in software.

MetalMackey
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Areyos Alektor
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Joined: 19th Feb 2007
Location: France
Posted: 7th Sep 2008 21:00
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You can put the code that you use?

In fact the use of parallelism and the acceleration of physics as stated BatVink means that you can do more without losing too many frame. But more must be understood by putting more elements to manage. For example, in the same scene there may be several fluid emitter, soft and hard body. It must not hesitate to mix hardware, software and shaders.
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