public override void Update(float delta)
{
Frame = RelativeFrame.FromPoint(Body, Vector3.Zero);
DxVector3 position = new DxVector3(Body.LinearPosition.X, Body.LinearPosition.Y, Body.LinearPosition.Z);
DxQuaternion quat = new DxQuaternion(Body.AngularPosition.X, Body.AngularPosition.Y, Body.AngularPosition.Z, Body.AngularPosition.W);
Transform = Matrix.RotationQuaternion(quat) * Matrix.Translation(position);
Vector3 steering = new Vector3();
steering.X = (Frame.LinearPosition.X < 0) ? 3 : -3;
steering.Z = (Frame.LinearPosition.Z < 0) ? 3 : -3;
const int Thrust = 150;
steering.Y = Thrust;
if (Frame.LinearPosition.Y > 0)
{
steering.Y = Math.Min(Thrust, Frame.LinearPosition.Y + 20);
}
//Body.AccumulateLocalCentralForce(force);
Body.AccumulateLocalForce(steering, new Vector3(0, -2, 0));
//Body.AccumulateGlobalCentralForce(new Vector3(y: -9.81f));
Body.LinearDampening = new Vector3(0.5f);
Body.AngularDampening = new Vector3(0.5f);
Body.Integrate(delta);
Body.ClearForces();
// Eject particles
countdown += delta;
while (countdown > 0.01f)
{
var body = new Body();
body.LinearPosition = RelativeFrame.ToGlobalPoint(Body, new Vector3(y: -8));
body.LinearVelocity = Body.LinearVelocity;
body.AngularPosition = Body.AngularPosition;
body.ApplyLocalCentralImpulse(new Vector3(0, -steering.Y, 0));
body.AccumulateGlobalCentralForce(new Vector3(y: 10));
body.LinearDampening = new Vector3(0.2f);
Particles.Insert(0, body);
countdown -= 0.01f;
}
if (Particles.Count > 100)
{
Particles.RemoveRange(100, Particles.Count - 100);
}
ParticleMesh.IndexCount = Particles.Count;
for (int i = 0; i < Particles.Count; i++)
{
Particles[i].Integrate(delta);
ParticleMesh.Dynamic[i].Position = Particles[i].LinearPosition;
}
ParticleMesh.UpdateDynamic();
}
