Casting Byte Ptr to Tvec3

[Volker]

I want to use the force parameter from Collisioncallback.

But it is passed as Byte Ptr. How do I get the force as Tvec3?

[Canardia]

Probably something like this would work, but it seems like a good idea to add this to mathlib:

void _stdcall EntityCollisionCallback( TEntity entity0, TEntity entity1, byte* position, byte* normal, byte* force, flt speed )
{
TVec3 hitforce;
hitforce.X=force[0];
hitforce.Y=force[4];
hitforce.Z=force[8];
}

[Volker]

void _stdcall EntityCollisionCallback( TEntity entity0, TEntity entity1, byte* position, byte* normal, byte* force, flt speed )
{
TVec3 hitforce;
hitforce.X=force[0];
hitforce.Y=force[4];
hitforce.Z=force[8];
}

 

Ehm, you mean I should use C++ code in Blitzmax?

 

The most of the EntityCollisionCallback parameters seem to be pretty useless if I can't get them in an usable format for Blitzmax.

[Canardia]

Well, you can use C++ code in BlitzMax, but that's not the point here now.

BlitzMax should have a similar method to construct a foreign type from pointers, like in the C++ example I showed.

Indeed, Josh started to use those wierd [] operators for float arrays some time ago, so instead of saying Vec3(1,2,3) he says [1,2,3]. So I think the Byte Ptr problem could be easily solved using the fact that Vec3 is just an array of 3 subsequent float (4 byte) values.

[Masterxilo]

Probably something like this would work, but it seems like a good idea to add this to mathlib:

void _stdcall EntityCollisionCallback( TEntity entity0, TEntity entity1, byte* position, byte* normal, byte* force, flt speed )
{
TVec3 hitforce;
hitforce.X=force[0];
hitforce.Y=force[4];
hitforce.Z=force[8];
}

Why so complicated?

TVec3 *pHitForce = reinterpret_cast<TVec3*>(force);

[Josh]

I am not sure why I chose to use byte ptrs in BlitzMax. A Vec3 makes more sense to me, don't you think?

[macklebee]

I am not sure why I chose to use byte ptrs in BlitzMax. A Vec3 makes more sense to me, don't you think?

 

yes please.

[Josh]

Fortunately if I change this, any code that worked with byte ptrs should work with vec3 objects as well.