Raydium 3D Game Engine

Official forum for everything about Raydium, ManiaDrive, MeMak, ...
It is currently Mon Aug 19, 2019 7:03 pm

All times are UTC




Post new topic Reply to topic  [ 10 posts ] 
Author Message
PostPosted: Tue Dec 27, 2005 2:15 am 
Offline
User avatar

Joined: Thu Sep 29, 2005 2:59 pm
Posts: 828
I'm trying to make a car that can be dismantled with the collisions, but i like the car will be form of the whole pieces from the begining, so a door of the car could have been destroyed after a collission, but the car will continue racing with no problem.
Ideas? fixings? joints with 0 values?


Top
 Profile  
 
 Post subject:
PostPosted: Tue Dec 27, 2005 8:28 am 
Offline
User avatar

Joined: Sun Mar 16, 2003 2:53 am
Posts: 2590
Location: gnniiiii (Scrat)
IMHO, the main question is: is the car must behave exactly the same way after a door loose (ie: without changing the shape and the weight of the car) ?

If yes, the solution is probably to build the car with a single body (from physics point of vue) and to "attach" other elements while rendering (with raydium_ode_element_RelPointPos() for example).
Then, it's easy to extract (visually) an element from the car, creating a new physic body for this element. You must "monitor" collisions to detect when an element must leave the car. It also possible to build breakable joints (such a hinge joint) instead of just throwing the element away from the car, so the door can flap a bit before falling of.

PS: actually, there's no joint feedback for fixed joints in ODE, so there's no breakable fixed joints with Raydium. We may implement a small workaround (using collision force ?) to allow this, so the car can be "automatically" destructible . This solution is obviously slower than the first one, but more "realistic". And you can also use breakable hinge joints with this solution, too. The other good point here is that this solution is automatically "network friendly".


Top
 Profile  
 
 Post subject:
PostPosted: Tue Dec 27, 2005 11:47 am 
Offline
User avatar

Joined: Thu Sep 29, 2005 2:59 pm
Posts: 828
Really, i'd like the physic would change if the door(or another element) is extracted from the car. So that method doesn't fit very well in to my idea.
And what is the problem with the "network friendlynes"?
Example of i want it do:
1-you are walking correctly with the full car.
2- you hit and a door now is opened but still turns over his axis
3- you hit again but this time the door and an whell are extracted for the car, but the gameplay continue...


Top
 Profile  
 
 Post subject:
PostPosted: Tue Dec 27, 2005 12:52 pm 
Offline
User avatar

Joined: Sun Mar 16, 2003 2:53 am
Posts: 2590
Location: gnniiiii (Scrat)
The second method (fixed joints -> hit -> hinge joint -> hit -> element falls from car) does all this.
The only problem is that we must add "fixed joints breakable support" to RayODE.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Dec 27, 2005 4:53 pm 
Offline
User avatar

Joined: Thu Sep 29, 2005 2:59 pm
Posts: 828
i have no idea about ODE internals. It's hard to implement?


Top
 Profile  
 
 Post subject:
PostPosted: Tue Dec 27, 2005 5:44 pm 
Offline
User avatar

Joined: Sun Mar 16, 2003 2:53 am
Posts: 2590
Location: gnniiiii (Scrat)
Probably not. I think I can do it in one hour or two, including tests. The idea is to check every contact point generated on "fixed joint attached elements" and delete this joint if the value is beyond a threshold.

With current RayODENet, we can expect strange network behaviors with fixed joints, I think (beacause of prediction). There's probably a bit of work here too.

I'll look at this soon.

PS: About "the other subject", I haven't forgot you vicente, but I've a lot of work this days, so it's hard to take the needed time :)


Top
 Profile  
 
 Post subject:
PostPosted: Tue Dec 27, 2005 6:01 pm 
Offline
User avatar

Joined: Thu Sep 29, 2005 2:59 pm
Posts: 828
about "the other subject", there is no problem, take your time...:)


Top
 Profile  
 
 Post subject:
PostPosted: Thu Mar 09, 2006 7:29 pm 
Offline
User avatar

Joined: Thu Sep 29, 2005 2:59 pm
Posts: 828
i'm here again.
Xfennec, finally the support for breakable joints has been added?
And did you speak with someone about the "other subject"?


Top
 Profile  
 
 Post subject:
PostPosted: Thu Mar 09, 2006 9:17 pm 
Offline
User avatar

Joined: Sun Mar 16, 2003 2:53 am
Posts: 2590
Location: gnniiiii (Scrat)
heu... well... no and no :oops: Sorry :)
I've just added "breakable fixed joints" on my TODO on the wiki (so I dont forget it one more time :) ), and I'll try to contact someone soon who might help me to know more about our problem.

Sorry, again !


Top
 Profile  
 
 Post subject:
PostPosted: Thu Mar 09, 2006 10:07 pm 
Offline
User avatar

Joined: Thu Sep 29, 2005 2:59 pm
Posts: 828
jejeje, no problem ;)


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group