[ODE] 2d Rotation/tranformation

[Ed Jones]

Howdy,

I reckon the best way to use ODE in 2D is to utilise Peter Serocka's 
fabulous Plane2D joint, which you can find here;

http://www.mathematik.uni-bielefeld.de/~pserocka/ODE-Plane2D/

If you rummage about in the mailing list archives for posts with "2D" in 
the title then you'll find that there have been a few discussions of 
this in the past.
There is a way to get Google to search the archives for you, but I can 
never remember how to do that!

<offtopic>
Just out of interest; Which sprite engine are you using? I've looked at 
Kyra and ZEngine in the past, but neither seemed to do exactly what I 
wanted. Or have you rolled your own?
</offtopic>

Cheers,
Ed.


garry wrote:

> Hi,
>  
> This is my first day using ODE, and the learning curve is a bit 
> steep.. So here's my questions.
>  
> I'm going to be using it in a 2d game, ideally to have boxes and stuff 
> to shoot about. This means that I have no use for the 3rd dimension, 
> therefore - would this be acceptable to do?
>  
> const dReal *dr =dBodyGetPosition(objbody[i]);
>  dBodySetPosition (objbody[i], dr[0],1,dr[2]);
>  
> Which would 'stick' the boxes to that one plane? Would that work?
>  
>  
> Also, I do this
>  
> const dReal *R2 = dBodyGetRotation (objbody[i]);
>  
> then
>  
> gfx.SpriteDrawEx(texture, dr[0], dr[2], R2[0],.....
>  
> The X and Y seem to work properlu (dr[0], dr[2]) But the rotation 
> (R2[0])seems a bit dodgy. Is the rotation from dBodyGetRotation in 
> radians?
>  
> Final question, related to the last one. I need to restrict the 
> rotation of the objects to one dimension, what would be the best way 
> of doing that? I was looking at something like this:-
>  
> dRFromAxisAndAngle (r,1,0,0,angle);
>  
> But the radians problem creeps in, I can't determine whether the ange 
> is in radians or if i'm rotating along the wrong axis..
>  
> Any help is really appreciated..
>  
> garry.
>  
>
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