Vehicles in 3.0?

[JoeJ]

+1

Mixing C++ and C interface feels not well.
C interface for everything also allows you to change internals and users won't even notice mostly.

[Sweenie]

I'm trying to implement the vehicle and I've got a few questions regarding chassis coordinate system and the tires.

I'm using C4 Engine and it uses Z-axis as up vector.
So I guess I should use these values for chassisFrame

Code: Select all

dVector grav = dVector(0.0f, 0.0f, -9.8f, 0.0f); Downwards on Z-axis
float mass = 2500.0f;
// create the coordinate system
dMatrix chassisMatrix;
chassisMatrix.m_front = dVector(1.0f, 0.0f, 0.0f, 0.0f);// vehicle direction of travel
chassisMatrix.m_up = dVector(0.0f, 0.0f, -1.0f, 0.0f);// downward vehicle direction
chassisMatrix.m_right = chassisMatrix.m_front * chassisMatrix.m_up;
chassisMatrix.m_posit = dVector(0.0f, 0.0f, 0.0f, 1.0f);


Is this correct?

And then I pass the tire locations, are those location vectors supposed to be in local space or world space?

[Julio Jerez]

I have no tested but I think that for a system with z up, and assuming y is front direction, then the matrix will be

Code: Select all

chassisMatrix.m_front = dVector (0.0f, 1.0f, 0.0f, 0.0f); // vehicle direction of travel
chassisMatrix.m_up    = dVector (0.0f, 0.0f, 1.0f, 0.0f);// downward vehicle direction
chassisMatrix.m_right = chassisMatrix.m_front * chassisMatrix.m_up;   // side direction (the plane of the wheels)
chassisMatrix.m_posit = dVector (0.0f, 0.0f, 0.0f, 1.0f);

edit:
the tires are parametric, (local space)