Collision detection for driving game

[mk0505]

I am doing a 3D racing game in Director, and it's the first time I do a 3D game
in director.
Could anyone sugget me that what is the best way to program the collision
detection between the car and the
edge of the track.

SIncerely

Mark

[ensamblador]

the best way is a technique called "ray casting". Basically it draws a ine
(ray) starting from a point in the space and with a specific direction, then
you must check what models are intersected by the ray, and if they distance is
greater than the minimum needed for a collision.

Lingo have "modelsUnderRay()" method that do it quicly and efficient.

Of course, if you want to use physics, install havok xtra. But consider the
first option:

You have the position of the car and its local x axis, -x axis, -y axis, y
axis.

check the models itersected by the rays casted in ther four directions,
starting from the position of the car.

If the distance to the edge is less than a value, simply move the car model in
the opossite direction (-ray),

[mk0505]

where do I download the Havok Xtra? is it free?

[=?ISO-8859-1?Q?Agust=EDn_Mar=EDa_Rodr=EDguez?=]

mk0505 wrote:

> I am doing a 3D racing game in Director, and it's the first time I do a 3D game
> in director.
> Could anyone sugget me that what is the best way to program the collision
> detection between the car and the
> edge of the track.

I´d go for Havok!
--
Agustín María Rodríguez | Partner
Methanoia Studio | http://www.methanoia.com
---------------------------------------------------
www.onwine.com.ar > Macromedia Director demos & code

[=?ISO-8859-1?Q?Agust=EDn_Mar=EDa_Rodr=EDguez?=]

mk0505 wrote:

> where do I download the Havok Xtra? is it free?

Yes, it´s free.
http://director-online.com/havok/
--
Agustín María Rodríguez | Partner
Methanoia Studio | http://www.methanoia.com
---------------------------------------------------
www.onwine.com.ar > Macromedia Director demos & code

[Mal]

Hi Mark,
> I am doing a 3D racing game in Director, and it's the first time I do a 3D game
> in director.
> Could anyone sugget me that what is the best way to program the collision
> detection between the car and the
> edge of the track.
This might be a quick way of testing your 3D models ( if you have some
existing ones ) within Shockwave 3D, and using Havok...

http://www.candointeractive.com/gamedesign/car

If it works OK in that, at least you'll know that your 3D environment is
going to be fine.

Regards...
Mal