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post #11 of 29 (permalink) Old 01-03-2020, 11:59 PM
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Quote: Originally Posted by UltraMega View Post
Are other physics engines not multi threaded? Is there anything special about this?
Finite Element Methods is how scientists and engineers actually model physical systems (along with finite difference). It's a numerical technique to solve non-linear, high order partial differential equations, often coupled.

It's a slow, computationally expensive technique since you're literally breaking down a physical problem in to thousands and millions or billions of simple elements and iterating them from an initial condition with boundary conditions until a solution is stable... on top of that coupling it with other physical models (think, heat transfer solution affecting thermal strain and material strength solutions).

Again, this is how actual physical models are solved for complex problems... like aerodynamics, material behavior... everything... nuclear weapons, heat transfer, weather models, etc. All those YUGE super computers are great for this because it extremely parallelized computation like graphics... it essentially ends up as one YUGE matrix operation.

Even in a simplified form, it's slow for games and real-time situations.

AMD took a SMALL application of this technique and got it working quickly enough for games. Anything that will make games look and move and deform more realistically is great imho. Games haven't "loosened" up much in the past 10 or 15 years... everything is so rigid... I, of course, blame crappy console CPUs.

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post #12 of 29 (permalink) Old 01-04-2020, 12:31 AM
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Quote: Originally Posted by 8051 View Post
The recent versions of PhysX are multi-threaded. This AMD demo doesn't seem all that more advanced than the PhysX demos I've seen:

https://www.youtube.com/watch?v=QuKBZlRFpiA

and

https://www.youtube.com/watch?v=1o0Nuq71gI4

That's a nice program..... aka resource hog.


This is direct-to-metal CPU libraries that the devs don't have to optimise for each different program.

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post #13 of 29 (permalink) Old 01-04-2020, 03:50 AM
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Quote: Originally Posted by Redwoodz View Post
That's a nice program..... aka resource hog.


This is direct-to-metal CPU libraries that the devs don't have to optimise for each different program.
The Physx I've seen in games hasn't been much of a resource hog. Smoke, shrapnel, fluids, cloth, never seen them overwhelm my fanless 23w pciex1 gt730 plugged into whatever pciex1 slot is available. That's about the power of 1 cpu core. How many will FEMFX cost? And can you make your own chiplet modification by adding in an old, obsolete graphics card?

Of course if you have a lot of cpu cores just going to waste, FEMFX is saving on physical resources. Gpu cores are pretty efficient for this stuff though.

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post #14 of 29 (permalink) Old 01-04-2020, 05:29 AM
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Quote: Originally Posted by umeng2002 View Post
AMD took a SMALL application of this technique and got it working quickly enough for games. Anything that will make games look and move and deform more realistically is great imho. Games haven't "loosened" up much in the past 10 or 15 years... everything is so rigid... I, of course, blame crappy console CPUs.
You're not kidding. I recently replayed HL2, and the whole time I was thinking "why does this look like 2019 physics?" I'm not sure it speaks to how great and sandboxxy Source was or to how stagnant these effects have remained in newer games; probably both.

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post #15 of 29 (permalink) Old 01-04-2020, 07:55 AM
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Is Microsoft doing anything with the Havok engine they acquired? Im just waiting for them to integrate it into Directx
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post #16 of 29 (permalink) Old 01-04-2020, 01:22 PM
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Quote: Originally Posted by ToTheSun! View Post
You're not kidding. I recently replayed HL2, and the whole time I was thinking "why does this look like 2019 physics?" I'm not sure it speaks to how great and sandboxxy Source was or to how stagnant these effects have remained in newer games; probably both.
Source uses havock. HL2 has good physics but there were never more than a few physics objects on screen at once.

If you want to see some cool physics from an old have, check this out:

This was the game that started the physx brand before Nvidia acquired it.

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post #17 of 29 (permalink) Old 01-04-2020, 01:39 PM
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Quote: Originally Posted by ToTheSun! View Post
You're not kidding. I recently replayed HL2, and the whole time I was thinking "why does this look like 2019 physics?" I'm not sure it speaks to how great and sandboxxy Source was or to how stagnant these effects have remained in newer games; probably both.
This. Physics and AI have not improved much. FEAR still has better AI than the majority of games released these days and that's about 15 years old now.


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post #18 of 29 (permalink) Old 01-04-2020, 03:22 PM
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i thought it all looked good except the shooting of the wood targets. That looked weird as hell lol, does not look like that at all in my opinion.

Quote:Originally Posted by Clinic http://static.overclock.net//img/forum/go_quote.gif
Its a benchmark thread...if you want pics go look on newegg. Thats what the cards look like. They didn't secretly send me orange ones.
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post #19 of 29 (permalink) Old 01-04-2020, 10:39 PM
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If anything, physics has regressed since console games need all the CPU and GPU compute they can muster to get to 1080p 60.

Some of you might not realize just how under-powered the PS4 and X1 were. They should have been at least as powerful as the PS4 Pro and X1 X at launch... The CPUs should have been more powerful than what's in the PS4 Pro and X1X since launch too.

But MS and Sony wanted to save money with an APU... and AMD didn't have a good CPU architecture to put in an APU other than Jaguar.

The only good thing about the bad CPU performance of the current consoles is that it forced lazy console devs to develop optimizations and multi-thread their games, which has translated somewhat well to PC ports.

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post #20 of 29 (permalink) Old 01-05-2020, 01:31 AM
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Quote: Originally Posted by 8051 View Post
The recent versions of PhysX are multi-threaded. This AMD demo doesn't seem all that more advanced than the PhysX demos I've seen:

and
But Physx = nvidia so its bad, opengpu = AMD so its good.

Anything physx in OCN is horrible, bad, should never exist, when you use physx you praying to the devil.

Quote: Originally Posted by rluker5 View Post
The Physx I've seen in games hasn't been much of a resource hog. Smoke, shrapnel, fluids, cloth, never seen them overwhelm my fanless 23w pciex1 gt730 plugged into whatever pciex1 slot is available. That's about the power of 1 cpu core. How many will FEMFX cost? And can you make your own chiplet modification by adding in an old, obsolete graphics card?

Of course if you have a lot of cpu cores just going to waste, FEMFX is saving on physical resources. Gpu cores are pretty efficient for this stuff though.

Physx can also run on CPU and not just GPU (and it can run multi threaded since at least 2010). It is now open source and AMD can optimize and run it through GPU as well. They just don't want to.



Last edited by Defoler; 01-05-2020 at 01:38 AM.
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