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ryanbatcund

Clouds/HDR affecting FPS

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For some reason the type of clouds, along with HDR really can kill performance

 

I use Opus and with HDR on (and the new quick tweak for it), certain angles are horrible.  

 

Example, off the side here I've got 30 fps locked, cloud shadows and all.  But behind me with more clouds, and the fps almost cut in half.  I turned off HDR and only lost about 15%.  With HDR on the loss is about 45%

 

Anyone else see this?

 

clouds30.jpg

 

clouds18.jpg

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Get rid of Opus, and do you have the same problem? If not... then the problem is Opus... not anything in Prepar3D.

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I could try but I'm guessing opus is a factor, but because there is no default engine that will produce the same cloud effects....  For some reason the HDR has a serious time with all the clouds...

 

Bah I think p3d is just too much for my system.

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I am in the same boat and desperate. I get moderate performance but as soon as I am flying near clouds the S***T Hits the fan. It starts stuttering performance becomes wacky. I thought it was just OPUS but I then selected fogged in and it was a slide show even on the ground. Really dissapointing but I am working on my PPL. I dont think I will be investing money on a new GPU to update my 550TI GTX. 

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I have default clouds max coverage at 100mi and HDR on and I am doing well. When I tried OPUS it was a huge hit even with FSX

 

Bob

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Yeah, I do notice a small fps drop with HDR on.  I wonder if this is due to ATI/AMD video card

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Bob. What are your specs? For me its the opposite. FSX runs like a dream with highmemfix and affinitymask 84. on my i7 2600K 3.40GHZ 8GB Ram and NVidia 550TI. I know my GPU is low but the performance I am getting is unexplainable. I have tested and changed settings around and the only thing that works for me is cloud on Simple. That will give me a smooth experience. 

 

 If I do not do that then I get great FPS but when I am IMC it really is just utter crap. Does not make sense that I have so many add ons running in FSX at a steady 15-35 FPS depending on cities with no stutters and then default P3D i am getting that headache.

 

 

 I am so dissapointed I thought I was going to be able to swtich platforms but I do not see what the problem is 

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Bob. What are your specs? For me its the opposite. FSX runs like a dream with highmemfix and affinitymask 84. on my i7 2600K 3.40GHZ 8GB Ram and NVidia 550TI. I know my GPU is low but the performance I am getting is unexplainable. I have tested and changed settings around and the only thing that works for me is cloud on Simple. That will give me a smooth experience. 

 

 If I do not do that then I get great FPS but when I am IMC it really is just utter crap. Does not make sense that I have so many add ons running in FSX at a steady 15-35 FPS depending on cities with no stutters and then default P3D i am getting that headache.

 

 

 I am so dissapointed I thought I was going to be able to swtich platforms but I do not see what the problem is 

HI,

 

I have an i7 2600k OC=4.5 -- GTX760 8gig -- 8gig main memory.  Mediocre now but top of the line when I bought it LOL. 

Since I am getting some very nice performance and LM is getting this monster engine tuned, I may look into upgrading soon.

 

Bob 

 

Bob

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I am so dissapointed I thought I was going to be able to swtich platforms but I do not see what the problem is

 

P3D makes much more use of the video card than FSX

so that 550 is sure to be your limiting factor here.

 

gb.

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Yeah that too me just says what I did not want to hear. I need a new GPU

 

I had a gtx570 before and the 760 with 8gig did not make a huge difference with FSX, but it did with P3D. Not sure why though.

Maybe the p3d code is more efficient.

 

Bob

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With my 780 Ti I can keep to 30fps with thick clouds(with the cap at 40) but I can tell they do hog performance. I'm waiting to try ASN once they get SP1 out (with 2.3 support, among many other things.) Video card really does make all the difference in P3D v2. 

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I just tested some more, and wow, thick cloud coverage really does hammer FPS in 2.3. Even with the default settings, I get down to around 22fps moving through a cloud layer... that's just awful.

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Yeah moreso in P3D than FSX....  I guess all the shadows and light calculations for HDR really kill ya.

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I'm not even using HDR. And in FSX, I can fly through the thickest cloud cover you can imagine at 40+ fps without a single frame drop, all with 32xS antialiasing...

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Opus only injects weather at fairly long intervals (60 minutes or 160 km) by default. It's not the injection that kills performance, it's the realistic weather. You are generally getting 3 cloud layers, plus turbulence, wind effects and precipitation. Add P3d's volumetric fog and you have enough to kill frame rates on the best systems out there, when flying in high overcast conditions.

 

In ASN (which should be updated for P3d 2.3 by next week some time) you can control the number of cloud layers, but then the weather may not be realistic if you set the maximum number to only 1 or 2.

 

My suggestion is to reduce both cloud draw distance and cloud density from within the P3d2 UI. You could also use REX 4 Texture Direct and set the cloud textures to 512 instead of 1024. Other possibilities are either to turn cloud shadows off or change these variables in Prepar3d.cfg to:

[GRAPHICS]
...
GROUND_SHADOW_TEXTURE_SIZE=512
CLOUD_SHADOW_TEXTURE_SIZE=512

Experiment and see what works best on your system.

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My suggestion is to reduce both cloud draw distance and cloud density from within the P3d2 UI. You could also use REX 4 Texture Direct and set the cloud textures to 512 instead of 1024. Other possibilities are either to turn cloud shadows off or change these variables in Prepar3d.cfg to:

[GRAPHICS]

...

GROUND_SHADOW_TEXTURE_SIZE=512

CLOUD_SHADOW_TEXTURE_SIZE=512

Experiment and see what works best on your system.

 

That's the only solution that works for me.  I keep cloud coverage density at medium and cloud draw distance at 80 miles.  I can manage a little more than that if the weather isn't too cloudy to begin with, but in anything from "mostly cloudy" on up, the frames grind down and the stutters set in.  I also use low-res REX4 clouds (they look more realistic to me) and I've applied the shadow texture size tweak.

 

In 2.2, the heaviest performance hit I took was with ASN, with Opus a close second.  I got my best results with FS Global Real Weather, I think because it doesn't use cumulus to render stratus.  Maybe for that reason, its cloud coverage looked heavier even at medium density.  ASN tended to give me rainstorms under sunny skies, but for me the tradeoff in realism was worth it to gain back performance.  

 

Since neither ASN nor FSGRW works with 2.3, I'm hanging in with Opus at the moment.

 

My system specs are in my profile.  Highlights: i7 3770k @ 4.8 MHz (delidded and water-cooled), 8 megs GSkill 2400 DDR RAM, EVGA 780ti Hydrocopper.  Autogen sliders at normal, MyTraffic at 15 percent, Water Ultra, cockpit, building and cloud shadows on, shadow quality medium.  In all not a bad system and (I think) sane sliders, but clouds need very careful handling.

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Alright at least I know it's not just me....  like most still fiddling my way around P3D.

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[GRAPHICS] ... GROUND_SHADOW_TEXTURE_SIZE=512 CLOUD_SHADOW_TEXTURE_SIZE=512

 

Wow, - I never knew about that tweak.  My clouds were already set to 512 (along with Rex4 512 clouds)...but ground shadow texture was set at 2048.  Changed it to 512

 

Thanks

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Wow, - I never knew about that tweak.  My clouds were already set to 512 (along with Rex4 512 clouds)...but ground shadow texture was set at 2048.  Changed it to 512

 

Thanks

 

This is great not sure if it will make difference but thinking 2048 is probably that for a reason - hope not as this would be a nice edit

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Very interesting. I am going to try changing the texture size today because in FSX that is what I have 512 for cloud textures and it really boosted my FPS back in the day.

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I've also noticed a significant performance loss in 2.3 when flying through or just looking at clouds, both with and without HDR. I've mostly used FSGRW in 2.2 with almost zero fps drop. Now since many weather tools don't work with 2.3 I've switched to default weather for a while and that's when the performance issues occured. Interestingly, I've now used Ideal Flight 10's weather engine for a while and had no fps issues at all - possibly because the weather depiction is fairly simple without much stratus.

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I've also noticed a significant performance loss in 2.3 when flying through or just looking at clouds, both with and without HDR. I've mostly used FSGRW in 2.2 with almost zero fps drop. Now since many weather tools don't work with 2.3 I've switched to default weather for a while and that's when the performance issues occured. Interestingly, I've now used Ideal Flight 10's weather engine for a while and had no fps issues at all - possibly because the weather depiction is fairly simple without much stratus.

 

Your using Idealflight in P3D 2.3 ? are you using all its features - I know Steve has not started any work in IF for P3D

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I've been using IF10 for a while now in 2.2, and as far as I can tell everything is working as it should - except that you can't start a flight from the IF10 screen, but instead have to load the flight in P3D and then click the "start from menu" button in IF10. Otherwise, everything seems to work: Flight plan creation, flight evaluation, weather, etc. Even importing flight plans into the Majestic Dash 8 FMC is possible.

I have only made four flights with IF10 in 2.3, so I can't say for sure, but so far I've not encountered any problems.

Note that I'm using a beta version (10.011 sg17) which can be found in the IF10 forums. However, the previous release version worked fine too.

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