void EERIE_PHYSICS_BOX_ComputeForces(EERIE_3DOBJ * obj)
{
EERIE_3D PHYSICS_Gravity;
PHYSICS_Gravity.x = 0.f;
PHYSICS_Gravity.y = -20.f;
PHYSICS_Gravity.z = 0.f;
float PHYSICS_Damping = 0.6f;
float lastmass = 1.f;
float div = 1.f;
for (long k = 0; k < obj->pbox->nb_physvert; k++)
{
PHYSVERT * pv = &obj->pbox->vert[k];
// Reset Force
pv->force.x = pv->inertia.x;
pv->force.y = pv->inertia.y;
pv->force.z = pv->inertia.z;
// Apply Gravity
if (pv->mass > 0.f)
{
//need to be precomputed...
if (lastmass != pv->mass)
{
div = 1.f / pv->mass;
lastmass = pv->mass;
}
pv->force.x += (PHYSICS_Gravity.x * div);
pv->force.y -= (PHYSICS_Gravity.y * div);
pv->force.z += (PHYSICS_Gravity.z * div);
}
// Apply Damping
pv->force.x += (-PHYSICS_Damping * pv->velocity.x);
pv->force.y += (-PHYSICS_Damping * pv->velocity.y);
pv->force.z += (-PHYSICS_Damping * pv->velocity.z);
}
for (int k = 0; k < obj->pbox->nb_physvert; k++)
{
// Now Resolves Spring System
for (long l = 0; l < obj->pbox->nb_physvert; l++)
{
if (l != k) ApplySpring(obj, l, k, 18.f, 0.4f);
}
}
}
void SpringSys::Compute_Forces(TimeValue t, int index)
{
ApplyDrag(index);
ApplyUnaryForces(t, index);
ApplySpring(t, index);
}
