Screwy buoyancy & waves

Ramcourse · 03-26-12, 09:10 PM

In both GWX and stock, the ships behave oddly when you see them pummeled by heavy seas. There are some threads on improving this, but those are mainly concerned with improving the stability of the ships. I'd rather attack the source of the problem.

The problem is that the gravitational acceleration is effectively different for ships and for the water. In all cases I've seen, the water has a much higher gravitational acceleration than the ships. This causes hovering ships, and decks washing over way too much.

I suspect that the waves are governed with an undulating prescribed shape, which might have 'velocity' settings somewhere. I'd like to slow the waves down significantly. Does anyone have an inkling of where to start with this? Thus far, I have no clue where the wave motion is defined.

Anvart · 03-27-12, 03:02 AM

Only a file list where you can find something about the waves...
...
..\data\Cfg\Sim.cfg - section [Mech]
..\data\scene.dat - EnvData & EnvSim controllers
...
Be bold...

Wolfstriked · 03-27-12, 04:48 PM

I was very into trying to change the wave behaviors.I cant remember what I was doing though and it will take me awhile to get back into it....but I will start soon since I feel more can be done.Not much help for now.

Ramcourse · 03-28-12, 05:50 AM

Thanks for the pointers to the wave mechanics. It turns out to be simple - but not easy.

I've got the swell and chop frequencies right, and I've adjusted the amplitude to match, but the ships seem to have too much moment of inertia. How is this defined in the ship models? Does anyone know if this is a global setting, or if mass distribution is defined otherwise?

Anvart · 03-28-12, 06:06 AM

ShipName.sim... Try to play with object's mass, Gravity Center (gc_height, fr_ratio), object's drag (water resistance) coeficients in obj_Hydro... and may be something else.

Wolfstriked · 03-28-12, 01:57 PM

This might peak your interest and further the push for Sh3.Its where I stopped a yr ago.

I reduced the sea size so that at 15ms wind the sea is calmer(mainly because the physics look wrong at very high wind) but its still severe enough so that when played with "no stabilize view" the game is a bitch to target with accuracy.Go below and the scopes settle down with barely any movement.

2ms wind

8ms wind

14ms wind

03-26-12, 09:10 PM	#1
Ramcourse Watch Join Date: Mar 2007 Location: Netherlands Posts: 17 Downloads: 4 Uploads: 0	Screwy buoyancy & waves In both GWX and stock, the ships behave oddly when you see them pummeled by heavy seas. There are some threads on improving this, but those are mainly concerned with improving the stability of the ships. I'd rather attack the source of the problem. The problem is that the gravitational acceleration is effectively different for ships and for the water. In all cases I've seen, the water has a much higher gravitational acceleration than the ships. This causes hovering ships, and decks washing over way too much. I suspect that the waves are governed with an undulating prescribed shape, which might have 'velocity' settings somewhere. I'd like to slow the waves down significantly. Does anyone have an inkling of where to start with this? Thus far, I have no clue where the wave motion is defined.

03-27-12, 03:02 AM	#2
Anvart Admiral Join Date: Jan 2006 Location: Russia ® Posts: 2,492 Downloads: 122 Uploads: 1	Only a file list where you can find something about the waves... ... ..\data\Cfg\Sim.cfg - section [Mech] ..\data\scene.dat - EnvData & EnvSim controllers ... Be bold... __________________ Alex ® Moses said: "Don't create yourself an idol"...

03-28-12, 06:06 AM	#5
Anvart Admiral Join Date: Jan 2006 Location: Russia ® Posts: 2,492 Downloads: 122 Uploads: 1	ShipName.sim... Try to play with object's mass, Gravity Center (gc_height, fr_ratio), object's drag (water resistance) coeficients in obj_Hydro... and may be something else. __________________ Alex ® Moses said: "Don't create yourself an idol"... Last edited by Anvart; 03-28-12 at 08:31 AM.

03-28-12, 01:57 PM	#6
Wolfstriked Grey Wolf Join Date: Apr 2011 Posts: 756 Downloads: 237 Uploads: 0	This might peak your interest and further the push for Sh3.Its where I stopped a yr ago.I reduced the sea size so that at 15ms wind the sea is calmer(mainly because the physics look wrong at very high wind) but its still severe enough so that when played with "no stabilize view" the game is a bitch to target with accuracy.Go below and the scopes settle down with barely any movement. 2ms wind 8ms wind 14ms wind

03-27-12, 04:48 PM	#3
Wolfstriked Grey Wolf Join Date: Apr 2011 Posts: 756 Downloads: 237 Uploads: 0	I was very into trying to change the wave behaviors.I cant remember what I was doing though and it will take me awhile to get back into it....but I will start soon since I feel more can be done.Not much help for now.

03-28-12, 05:50 AM	#4
Ramcourse Watch Join Date: Mar 2007 Location: Netherlands Posts: 17 Downloads: 4 Uploads: 0	Thanks for the pointers to the wave mechanics. It turns out to be simple - but not easy. I've got the swell and chop frequencies right, and I've adjusted the amplitude to match, but the ships seem to have too much moment of inertia. How is this defined in the ship models? Does anyone know if this is a global setting, or if mass distribution is defined otherwise?