How to simulate stability from lift/weight for submarine?

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How to simulate stability from lift/weight for submarine? #307127
01/27/10 11:57 01/27/10 11:57

Joined: Jan 2010
Posts: 40
Adelaide, Australia

Sub_Game

OP
Newbie

Sub_Game

OP
Newbie

Joined: Jan 2010
Posts: 40
Adelaide, Australia

I'm mucking around with physics for my submarine model (am not yet decided if I want to write my own yet).

How can I simulate stability so that the boat will naturally gravitate to an upright neutral position?

This is what I have so far:

Code:

//--set physics--
ph_setgravity (vector(0, 0, 0));
	
phent_settype (my_submarine, PH_RIGID, PH_BOX);
phent_setmass (my_submarine, 3, PH_SPHERE);
phent_setfriction (my_submarine, 0); 
phent_setdamping (my_submarine, 30, 60); 
phent_setelasticity (my_submarine, 20, 0); 

//--INPUT--
if( key_r ) sub_thrust.x+=10;
if( key_f ) sub_thrust.x=10;
if( key_v ) sub_thrust.x-=10;
phent_addforcelocal( my_submarine, sub_thrust, nullvector );
		
if( key_a ) phent_addforcelocal( my_submarine, vector(0,-50,0), vector(-30,0,0) );

if( key_d ) phent_addforcelocal( my_submarine, vector(0,50,0), vector(-30,0,0) );

if( key_w ) phent_addforcelocal( my_submarine, vector(0,0,50), vector(50,0,0) );

if( key_s ) phent_addforcelocal( my_submarine, vector(0,0,-50), vector(50,0,0) );

Last edited by Sub_Game; 01/27/10 12:03.

A7 Commercial
First person submarine combat simulator project
http://alexanderforeman.webs.com/fightersubgame.htm

Re: How to simulate stability from lift/weight for submarine? [Re: Sub_Game] #308073 02/01/10 14:19 02/01/10 14:19
Joined: Jan 2010 Posts: 40 Adelaide, Australia Sub_Game OP Newbie
Sub_Game OP Newbie Joined: Jan 2010 Posts: 40 Adelaide, Australia	Anyone??? A7 Commercial First person submarine combat simulator project http://alexanderforeman.webs.com/fightersubgame.htm

Re: How to simulate stability from lift/weight for submarine? [Re: Sub_Game] #308085 02/01/10 14:58 02/01/10 14:58
Joined: May 2009 Posts: 1,816 at my pc (duh) darkinferno Serious User
darkinferno Serious User Joined: May 2009 Posts: 1,816 at my pc (duh)	meaning as if resurfacing? team INOV: CURRENT PROJECTS: http://www.youtube.com/user/teamINOV?feature=mhee FOLLOW US on twitter: http://twitter.com/team_iNoV check our blog: http://scionwars.blog.com/ shaders: http://shadec.project-havoc.com/ networking: http://www.anet-plugin.com/

Re: How to simulate stability from lift/weight for submarine? [Re: darkinferno] #308150 02/01/10 20:24 02/01/10 20:24
Joined: Jan 2010 Posts: 40 Adelaide, Australia Sub_Game OP Newbie
Sub_Game OP Newbie Joined: Jan 2010 Posts: 40 Adelaide, Australia	Either on the surface or underwater. Forces applied to the sub cause it to pan, tilt and roll as if it were a spacecraft. It needs to have a tendancy to go back to tilt=0 and roll=0 just like a real sub will. I could just command tilt and roll with something like tilt-=tilt/10*time_step; directly but that would defeat the purpose of using the physics yes? A7 Commercial First person submarine combat simulator project http://alexanderforeman.webs.com/fightersubgame.htm

Re: How to simulate stability from lift/weight for submarine? [Re: Sub_Game] #308152 02/01/10 20:43 02/01/10 20:43
Joined: May 2009 Posts: 1,816 at my pc (duh) darkinferno Serious User
darkinferno Serious User Joined: May 2009 Posts: 1,816 at my pc (duh)	well i dont think that would work either, you cant change the pan/tilt/roll of a physics object directly, i had a helicopter in my game once and what i did was: psuedo code: if (my_Angle NOT_EQUAL desiredAngle) { rotateBack(slow)//physics force ofcourse } basically use a small force that constantly tries to recenter your model, this force should be lower than whatever force you use to turn your model however, else you'll lose ability to turn it team INOV: CURRENT PROJECTS: http://www.youtube.com/user/teamINOV?feature=mhee FOLLOW US on twitter: http://twitter.com/team_iNoV check our blog: http://scionwars.blog.com/ shaders: http://shadec.project-havoc.com/ networking: http://www.anet-plugin.com/

Re: How to simulate stability from lift/weight for submarine? [Re: darkinferno] #308157 02/01/10 21:16 02/01/10 21:16
Joined: Jan 2010 Posts: 145 Doc_Savage Member
Doc_Savage Member Joined: Jan 2010 Posts: 145	well i think you need 2 separate types of physics, one for surfaced, and one for underwater, dont forget that underwater is close to no gravity also. Do not concern yourself with my race, personality or origin. find my record in the pits, and then make your wager.

Re: How to simulate stability from lift/weight for submarine? [Re: Doc_Savage] #308645 02/04/10 07:55 02/04/10 07:55
Joined: Jan 2010 Posts: 40 Adelaide, Australia Sub_Game OP Newbie
Sub_Game OP Newbie Joined: Jan 2010 Posts: 40 Adelaide, Australia	Thanks for the suggestions. OK - I've gotten pissed off with the awkward nature of the physics engine so I wrote my own. It works really well and the sub handles naturally. The only thing it doesn't do is transfer momentum to other objects on impact but I don't really need that anyway. I tweaked my physics so the boats really feel like the real thing. I've got a few work-mates to test-dive the sub and they love the feel of it. I've adapted the physics for both underwater, surface and airborne (for air-drops). A7 Commercial First person submarine combat simulator project http://alexanderforeman.webs.com/fightersubgame.htm

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