/// <summary>
/// Manages the switch to a new physics engine simulation.
/// </summary>
/// <param name="sim">Index of the simulation to switch to.</param>
public void SwitchSimulation(int sim)
{
currentSimulationIndex = sim;
//Clear out any old rendering stuff.
ModelDrawer.Clear();
ConstraintDrawer.Clear();
//Tell the previous simulation it's done.
if (currentSimulation != null)
{
currentSimulation.CleanUp();
}
//Create the new demo.
Type demoType = demoTypes[currentSimulationIndex - 1];
#if !WINDOWS
currentSimulation = (Demo)demoType.GetConstructor(new[] { typeof(DemosGame) }).Invoke(new object[] { this });
#else
currentSimulation = (Demo)Activator.CreateInstance(demoType, new object[] { this });
#endif
#region DisplayObject creation
foreach (Entity e in currentSimulation.Space.Entities)
{
if ((string)e.Tag != "noDisplayObject")
{
ModelDrawer.Add(e);
}
else //Remove the now unnecessary tag.
{
e.Tag = null;
}
}
for (int i = 0; i < currentSimulation.Space.Solver.SolverUpdateables.Count; i++)
{
//Add the solver updateable and match up the activity setting.
LineDisplayObjectBase objectAdded = ConstraintDrawer.Add(currentSimulation.Space.Solver.SolverUpdateables[i]);
if (objectAdded != null)
{
objectAdded.IsDrawing = currentSimulation.Space.Solver.SolverUpdateables[i].IsActive;
}
}
#endregion
GC.Collect();
}
public StandardDemo(DemosGame game)
: base(game)
{
freeCameraControlScheme = new FreeCameraControlScheme(10, game.Camera, game);
//Creates the player character (C).
character = new CharacterControllerInput(Space, game.Camera, game);
//Creates the drivable vehicle (V).
var wheelModel = game.Content.Load <Model>("carWheel");
var wheelTexture = game.Content.Load <Texture2D>("wheel");
whitePixel = game.Content.Load <Texture2D>("whitePixel");
vehicle = new VehicleInput(new Vector3(10000, 0, 0), Space, game.Camera, game, game.ModelDrawer, wheelModel, wheelTexture);
Space.ForceUpdater.Gravity = new Vector3(0, (Fix64)(-9.81m), 0); //If left unset, the default value is (0,0,0).
//Create the tossable ball.
kapow = new Sphere(new Vector3(11000, 0, 0), (Fix64).6m, 20);
kapowMaker = new Explosion(Vector3.Zero, 400, 15, Space);
//Create the right-click grab spring.
grabber = new MotorizedGrabSpring();
grabberGraphic = game.ConstraintDrawer.Add(grabber);
grabberGraphic.IsDrawing = false;
Space.Add(grabber);
Space.Add(kapow);
//IMPORTANT PERFORMANCE NOTE:
// BEPUphysics uses an iterative system to solve constraints. You can tell it to do more or less iterations.
// Less iterations is faster; more iterations makes the result more accurate.
//
// The amount of iterations needed for a simulation varies. The "Wall" and "Pyramid" simulations are each fairly
// solver intensive, but as few as 4 iterations can be used with acceptable results.
// The "Jenga" simulation usually needs a few more iterations for stability; 7-9 is a good minimum.
//
// The Dogbot demo shows how accuracy can smoothly increase with more iterations.
// With very few iterations (1-3), it has slightly jaggier movement, as if the parts used to construct it were a little cheap.
// As you give it a few more iterations, the motors and constraints get more and more robust.
//
// Many simulations can work perfectly fine with very few iterations,
// and using a low number of iterations can substantially improve performance.
//
// To change the number of iterations used, uncomment and change the following line (10 iterations is the default):
//Space.Solver.IterationLimit = 10;
rayCastFilter = RayCastFilter;
}
