[ODE] dBodyGet*

[amundbørsand]

Nate W <coding@natew.com> skreiv:

> The compiler requires that you store the results in a "const dReal *" so
> that it stays const.  If you assigned it to a non-const "dReal *" then the
> compiler wouldn't know you weren't supposed to change it, so it would let
> you change it, that would be bad.  (You can actually assign to a non-const
> object, using a cast, but you shouldn't.)

But how are one supposed to read these values? The only place (it seems)
where I'm allowed to make a const *dReal variable and being able to
assign the result from dBodyGetRotation is as a parameter to a function.
Is there no "normal" way to read these values? Can somebody provide a
code snippet?

> > const dReal *R=dBodyGetRotation(myBody);
> > everything compiles fine, but crashes immediately. 
> In any case, I'd suspect that myBody doesn't refer to an actual Body.  
> Any chance you're passing in a bogus value there?

I am actually suspecting it, I'll double check. But even if that's what
causes the crash I would still like a simpler and less clumsy way to
read the matrix (and position), other than having to make a function
which gets the stuff as parameters.