Canopy and FPS

[kobalt_]

Hi all,

 

The title may sounds strange, but here is my question : I wonder if MiG-21 pilots around here get a huge FPS drop when their bird has its canopy closed and sealed.

 

After having many tests and benchmarks, I noticed a large FPS drop when I close the canopy of the MiG-21.

My computer specs are not extreme (i5 2500k, 8gb ram, Geforce 750Ti, on a 21/9 screen), but I usually get a fair FPS rate with the MiG-21 (around 25-30 on ground, 40+ airborne).

 

For instance, when I spawn in the cockpit, cold startup, I usually get around 35 to 40 FPS rate, depending on where i look.

I start the MiG up, and when I close the canopy, I instantly loose like 10 to 15 FPS.

 

I did some tests too airborne, I forced the canopy jettison, and then it's a no contest result : my FPS increase by ~50%.

 

So I'd like to know why this happens ? It feels like the game is applying a graphic filter or something when the canopy is closed, which ruins the frame rate.

 

There may be a simple explanation, i'm curious.

 

Thx

[Einherjer]

Nice find, so let's fly cabrio style :-)

[Stealth_HR]

As far as I can tell (and I recall from previous experience with LOMAC, FC1, FC2 and FC3) the frame-rate drop happens due to the canopy scratches - the reflections and refraction calculated as the light passes through them are what causes the massive FPS drop.

 

There is a pair of textures that need to be modified - one contains the scratches, one contains the smudges (mud, dirt, dust on the cockpit). I have tried to edit them, but I don't have a tool to separate the alpha layer which contains the scratches.

[kobalt_]

Talking about canopy, FPS, cabriolet-style :

 

 

 

 

No problem flying at 10000" and above without canopy :smartass:

Was able to fly back the bird at airport then.

And still a wide FPS improvement without the canopy (50-80% improvement). Only problem is the noise generated, but i'll deal with that.

[Buzzles]

Do you have mirrors enabled? Might be related to that, as they are a resource hog.

[-Rudel-]

uuuhhg, I really gotta fix those flare dispenser location.

[kobalt_]

Do you have mirrors enabled? Might be related to that, as they are a resource hog.

 

Same FPS count with or without mirrors enabled...(or difference is barely noticeable)

Mirrors kill FPS with Su-27 for instance, not with the MiG-21's small periscope (at least with my setup).

[kobalt_]

Any news from LS on this matter ?

 

Do you think the 21's canopy "FX filter" or "FX effect" or whatever you may want to call it could be easily changed with a mod ? Like replacing it with the Su-27 or Su-25 canopy glass ?

[kobalt_]

Here is a quick recording i made showing this fps drop :

- Ingame resolution is 2560*1080

- the MiG is cold

 

Please note I recorded this with FRAPS, and this software makes my FPS dropping a lot. But still, it can gives you a good idea of the framerate ratio drop : 28 FPS canopy open (35/36 without FRAPS), 19 FPS canopy closed (about 24/25 without FRAPS).

 

[Saigon]

+1:(

Sometimes I have to eject the canopy to gain almost 8/10 frames

Edited October 17, 2015 by Saigon

[Cobra847]

We've already optimized the canopy glass.

 

The only other solution is to remove the glass entirely, which would very much negatively affect visual fidelity.

 

This happens mainly if you're using a little weaker GPU. The fillrate is lower, thus performance is more impacted.

[Haukka81]

Canopy and FPS

 

660GTX here with 2560x1440rez and canopy glass is no problem. Mig-21 and others run fine.

And this 660 is not top class gpu anymore..

 

So maybe just time to get new (used?) gpu ?

 

 

750 is quite low end gpu, many features removed, its slower even compared to my gtx660

 

Sent from my iPhone using Tapatalk

Edited October 17, 2015 by Haukka81

[Saigon]

Ok... I understand. Thanks Cobra.

Good evening.