Raydium 3D Game Engine

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 Post subject: A physics question
PostPosted: Tue Mar 11, 2008 6:57 pm 
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Joined: Mon Feb 18, 2008 10:16 pm
Posts: 4
Hy all, I have a question.
I'm busy building a racing simulation based on Maniadrive/Raydium.
It's not very difficult to understand most parts of raydium, but I have a question.
Where are the physics for the Clio located? The wiki has a physics page, but it's in French, and my French is from 15 years ago so not that good anymore :)
If I'm a bit further with the project I'll probably come back with more questions, but so far the engine is a really good start for me, thanks.

Dick


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 Post subject:
PostPosted: Tue Mar 11, 2008 8:21 pm 
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Joined: Thu Sep 29, 2005 2:59 pm
Posts: 828
Raydium includes ODE, a physic engine. So every "object" created in the game will be part of the physic engine.
So the physic is hidden (managed by ODE) and the physics properties are given when you create each object(for example when you create the parts of the car).

Have I answered you question?


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 Post subject:
PostPosted: Tue Mar 11, 2008 8:31 pm 
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Joined: Mon Feb 18, 2008 10:16 pm
Posts: 4
Thanks for the quick answer vincente, but it's not quite the answer that I was looking for ;)
I know Raydium's physics are handled by ODE, but where do I give in the properties for a car, for example the torque curve, gear ratio, but also the size of the car and where the wheels must be etc.
I'm pretty experienced in programming and 3d modelling, but I have to know where to start :)


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 Post subject:
PostPosted: Tue Mar 11, 2008 9:08 pm 
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Joined: Sun Oct 09, 2005 10:46 pm
Posts: 759
Hello,

look at create_car function.

You can find that car is approximated with a box, wheels by sphere.
Each have a mass.
Each wheel is moved after creation it will be the final place (after being fixed by a joint).

gear ratio is defined in

Code:
dReal gears[]={-0.4,0.4,0.6,0.8,0.9,1.0};

global var and gear

gear usage is disabled but still there
Code:
//    raydium_ode_motor_power_max_name("moteur",0.1);
//    raydium_ode_motor_gears_set_name("moteur",gears,6);
//    raydium_ode_motor_gear_change_name("moteur",gear);


An engine is there you can give his max power.

For the rest it is more complicated.
Ode doesn't natively support tork curve.
If you want to simulate this you have to read back engine speed and adapt motor power from the curve. You can do this at each timestep if you want.

Maniadrive is a big application, you can try with test8 (tank physic ;D) or test6, kinghill have a good car model that you can use.

Have a nice day
Ouille.


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