/// <summary>
/// We adjust the ball's linear / angular damping based on the surface.
/// This can be done clientside for prediction.
/// </summary>
protected void AdjustDamping()
{
var downTrace = Trace.Ray(Position, Position + Vector3.Down * OOBBox.Size.z);
downTrace.HitLayer(CollisionLayer.Solid);
downTrace.Ignore(this);
var downTraceResult = downTrace.Run();
if (Debug)
{
DebugOverlay.Line(downTraceResult.StartPos, downTraceResult.EndPos);
// if ( downTraceResult.Entity.IsValid() )
// DebugOverlay.Text( downTraceResult.StartPos, $"e: {downTraceResult.Entity.EngineEntityName}" );
}
// We are in the air, do nothing? (Maybe we could adjust something to make ball airtime feel nicer?)
if (!downTraceResult.Hit)
{
return;
}
// See if we're on a flat surface by checking the dot product of the surface normal.
if (downTraceResult.Normal.Dot(Vector3.Up).AlmostEqual(1, 0.001f))
{
switch (downTraceResult.Surface.Name)
{
case "minigolf.sand":
PhysicsBody.LinearDamping = 2.5f;
PhysicsBody.AngularDamping = 2.5f;
break;
case "minigolf.ice":
PhysicsBody.LinearDamping = 0.25f;
PhysicsBody.AngularDamping = 0.00f;
break;
default:
PhysicsBody.LinearDamping = DefaultLinearDamping;
PhysicsBody.AngularDamping = DefaultAngularDamping;
break;
}
if (downTraceResult.Entity is SpeedBoost speedBoost)
{
// TODO: Multiply by delta time
var velocity = PhysicsBody.Velocity;
velocity += Angles.AngleVector(speedBoost.MoveDir) * speedBoost.SpeedMultiplier;
PhysicsBody.Velocity = velocity;
}
return;
}
// We must be on a hill, we can detect if it's up hill or down hill by doing a forward trace
var trace = Trace.Ray(Position, Position + PhysicsBody.Velocity.WithZ(0));
trace.HitLayer(CollisionLayer.Debris);
trace.Ignore(this);
var traceResult = trace.Run();
if (traceResult.Hit)
{
PhysicsBody.LinearDamping = 0.015f;
PhysicsBody.AngularDamping = 2.00f;
return;
}
PhysicsBody.LinearDamping = 0.0f;
PhysicsBody.AngularDamping = 1.0f;
}
