Model which just sits in space.
Inheritance: SelfDrawingModelDisplayObject
        /// <summary>
        /// Constructs the front end and the internal physics representation of the vehicle.
        /// </summary>
        /// <param name="position">Position of the tank.</param>
        /// <param name="owningSpace">Space to add the vehicle to.</param>
        /// <param name="camera">Camera to attach to the vehicle.</param>
        /// <param name="game">Running game.</param>
        /// <param name="drawer">Drawer used to draw the tank.</param>
        /// <param name="wheelModel">Model to use for the 'wheels' of the tank.</param>
        /// <param name="wheelTexture">Texture of the wheels on the tank.</param>
        public TankInput(Vector3 position, Space owningSpace, Camera camera, DemosGame game, ModelDrawer drawer, Model wheelModel, Texture2D wheelTexture)
        {
            var bodies = new List<CompoundShapeEntry>()
            {
                new CompoundShapeEntry(new BoxShape(4f, 1, 8), new Vector3(0, 0, 0), 500),
                new CompoundShapeEntry(new BoxShape(3, .7f, 4f), new Vector3(0, .5f + .35f, .5f), 1)
            };
            var body = new CompoundBody(bodies, 501);
            body.CollisionInformation.LocalPosition = new Vector3(0, .5f, 0);
            body.Position = (position); //At first, just keep it out of the way.
            Vehicle = new Vehicle(body);

            #region RaycastWheelShapes

            //The wheel model used is not aligned initially with how a wheel would normally look, so rotate them.
            MaximumDriveForce = 1800;
            BaseSlidingFriction = 3;

            Matrix wheelGraphicRotation = Matrix.CreateFromAxisAngle(Vector3.Forward, MathHelper.PiOver2);
            for (int i = 0; i < 6; i++)
            {
                var toAdd = new Wheel(
                    new RaycastWheelShape(.375f, wheelGraphicRotation),
                    new WheelSuspension(2000, 300f, Vector3.Down, 1.3f, new Vector3(-1.9f, 0, -2.9f + i * 1.15f)),
                    new WheelDrivingMotor(10, MaximumDriveForce, MaximumDriveForce),
                    new WheelBrake(7, 7, 1.0f),
                    new WheelSlidingFriction(BaseSlidingFriction, BaseSlidingFriction));
                toAdd.DrivingMotor.GripFrictionBlender = FrictionBlender;
                toAdd.Brake.FrictionBlender = FrictionBlender;
                toAdd.SlidingFriction.FrictionBlender = FrictionBlender;
                Vehicle.AddWheel(toAdd);
                leftTrack.Add(toAdd);
            }
            for (int i = 0; i < 6; i++)
            {
                var toAdd = new Wheel(
                    new RaycastWheelShape(.375f, wheelGraphicRotation),
                    new WheelSuspension(2000, 300f, Vector3.Down, 1.3f, new Vector3(1.9f, 0, -2.9f + i * 1.15f)),
                    new WheelDrivingMotor(10, 2000, 1000),
                    new WheelBrake(7, 7, 1.0f),
                    new WheelSlidingFriction(BaseSlidingFriction, BaseSlidingFriction));
                toAdd.DrivingMotor.GripFrictionBlender = FrictionBlender;
                toAdd.Brake.FrictionBlender = FrictionBlender;
                toAdd.SlidingFriction.FrictionBlender = FrictionBlender;
                Vehicle.AddWheel(toAdd);
                rightTrack.Add(toAdd);
            }

            #endregion

            foreach (Wheel wheel in Vehicle.Wheels)
            {
                //This is a cosmetic setting that makes it looks like the car doesn't have antilock brakes.
                wheel.Shape.FreezeWheelsWhileBraking = true;

                //By default, wheels use as many iterations as the space.  By lowering it,
                //performance can be improved at the cost of a little accuracy.
                wheel.Suspension.SolverSettings.MaximumIterationCount = 1;
                wheel.Brake.SolverSettings.MaximumIterationCount = 1;
                wheel.SlidingFriction.SolverSettings.MaximumIterationCount = 1;
                wheel.DrivingMotor.SolverSettings.MaximumIterationCount = 1;
            }

            Space = owningSpace;

            Space.Add(Vehicle);
            ModelDrawer = drawer;
            DisplayModel model;
            WheelModels = new List<DisplayModel>();
            for (int k = 0; k < Vehicle.Wheels.Count; k++)
            {
                Vehicle.Wheels[k].Shape.Detector.Tag = "noDisplayObject";
                model = new DisplayModel(wheelModel, ModelDrawer);
                ModelDrawer.Add(model);
                WheelModels.Add(model);
                model.Texture = wheelTexture;
            }



            CameraControlScheme = new ChaseCameraControlScheme(Vehicle.Body, new Vector3(0, 0.6f, 0), true, 10, camera, game);

        }
        /// <summary>
        /// Constructs a new demo.
        /// </summary>
        /// <param name="game">Game owning this demo.</param>
        public InverseKinematicsTestDemo(DemosGame game)
            : base(game)
        {
            cameraControl = new FreeCameraControlScheme(10, game.Camera, game);
            whitePixel = game.Content.Load<Texture2D>("whitePixel");
            game.Camera.Position = new Vector3(0, 3, 5);
            Box ground = new Box(new Vector3(0, 0, 0), 30, 1, 30);
            Space.Add(ground);
            Space.ForceUpdater.Gravity = new Vector3(0, -9.81f, 0);

            stateControlGroup = new StateControlGroup(game.Camera, controls);

            drawer = new InstancedModelDrawer(game);

            solver.ActiveSet.UseAutomass = true;
            solver.AutoscaleControlImpulses = true;
            solver.AutoscaleControlMaximumForce = float.MaxValue;
            solver.TimeStepDuration = .1f;
            solver.ControlIterationCount = 100;
            solver.FixerIterationCount = 10;
            solver.VelocitySubiterationCount = 3;

            BuildChain(new Vector3(-5, 2, 0));

            BuildStick(new Vector3(-10, 2, 0));

            BuildActionFigure(new Vector3(5, 6, -8));
            BuildActionFigure(new Vector3(5, 6, -3));
            BuildActionFigure(new Vector3(5, 6, 3));
            BuildActionFigure(new Vector3(5, 6, 8));

            BuildCyclicMesh(new Vector3(-5, 5, -5));

            //BuildJointTest(new Vector3(0, 5, 0));
            //BuildTinyTest(new Vector3(0, 15, 0));

            BuildRoboArmThing(new Vector3(0, 5, 0));

            BuildRing(new Vector3(0, 10, 8));

            //Create the display objects.
            Model cylinder = game.Content.Load<Model>("cylinder");
            for (int i = 0; i < bones.Count; i++)
            {
                var displayBone = new DisplayModel(cylinder, drawer);
                var completedBone = bones[i];
                completedBone.DisplayBone = displayBone;
                bones[i] = completedBone;
                drawer.Add(displayBone);
            }
        }
        /// <summary>
        /// Constructs the front end and the internal physics representation of the Vehicle.
        /// </summary>
        /// <param name="position">Position of the Vehicle.</param>
        /// <param name="space">Space to add the Vehicle to.</param>
        /// <param name="camera">Camera to attach to the Vehicle.</param>
        /// <param name="game">The running game.</param>
        /// <param name="drawer">Drawer used to draw the Vehicle.</param>
        /// <param name="wheelModel">Model of the wheels.</param>
        /// <param name="wheelTexture">Texture to use for the wheels.</param>
        public VehicleInput(Vector3 position, Space space, Camera camera, DemosGame game, ModelDrawer drawer, Model wheelModel, Texture2D wheelTexture)
        {
            var bodies = new List<CompoundShapeEntry>
                {
                    new CompoundShapeEntry(new BoxShape(2.5f, .75f, 4.5f), new Vector3(0, 0, 0), 60),
                    new CompoundShapeEntry(new BoxShape(2.5f, .3f, 2f), new Vector3(0, .75f / 2 + .3f / 2, .5f), 1)
                };
            var body = new CompoundBody(bodies, 61);
            body.CollisionInformation.LocalPosition = new Vector3(0, .5f, 0);
            body.Position = position; //At first, just keep it out of the way.
            Vehicle = new Vehicle(body);

            var localWheelRotation = Quaternion.CreateFromAxisAngle(new Vector3(0, 0, 1), MathHelper.PiOver2);

            //The wheel model used is not aligned initially with how a wheel would normally look, so rotate them.
            Matrix wheelGraphicRotation = Matrix.CreateFromAxisAngle(Vector3.Forward, MathHelper.PiOver2);
            Vehicle.AddWheel(new Wheel(
                                 new CylinderCastWheelShape(.375f, 0.2f, localWheelRotation, wheelGraphicRotation, false),
                                 new WheelSuspension(2000, 100f, Vector3.Down, 0.325f, new Vector3(-1.1f, -0.1f, 1.8f)),
                                 new WheelDrivingMotor(2.5f, 30000, 10000),
                                 new WheelBrake(1.5f, 2, .02f),
                                 new WheelSlidingFriction(4, 5)));
            Vehicle.AddWheel(new Wheel(
                                 new CylinderCastWheelShape(.375f, 0.2f, localWheelRotation, wheelGraphicRotation, false),
                                 new WheelSuspension(2000, 100f, Vector3.Down, 0.325f, new Vector3(-1.1f, -0.1f, -1.8f)),
                                 new WheelDrivingMotor(2.5f, 30000, 10000),
                                 new WheelBrake(1.5f, 2, .02f),
                                 new WheelSlidingFriction(4, 5)));
            Vehicle.AddWheel(new Wheel(
                                 new CylinderCastWheelShape(.375f, 0.2f, localWheelRotation, wheelGraphicRotation, false),
                                 new WheelSuspension(2000, 100f, Vector3.Down, 0.325f, new Vector3(1.1f, -0.1f, 1.8f)),
                                 new WheelDrivingMotor(2.5f, 30000, 10000),
                                 new WheelBrake(1.5f, 2, .02f),
                                 new WheelSlidingFriction(4, 5)));
            Vehicle.AddWheel(new Wheel(
                                 new CylinderCastWheelShape(.375f, 0.2f, localWheelRotation, wheelGraphicRotation, false),
                                 new WheelSuspension(2000, 100f, Vector3.Down, 0.325f, new Vector3(1.1f, -0.1f, -1.8f)),
                                 new WheelDrivingMotor(2.5f, 30000, 10000),
                                 new WheelBrake(1.5f, 2, .02f),
                                 new WheelSlidingFriction(4, 5)));

            foreach (Wheel wheel in Vehicle.Wheels)
            {
                //This is a cosmetic setting that makes it looks like the car doesn't have antilock brakes.
                wheel.Shape.FreezeWheelsWhileBraking = true;

                //By default, wheels use as many iterations as the space.  By lowering it,
                //performance can be improved at the cost of a little accuracy.
                //However, because the suspension and friction are not really rigid,
                //the lowered accuracy is not so much of a problem.
                wheel.Suspension.SolverSettings.MaximumIterationCount = 1;
                wheel.Brake.SolverSettings.MaximumIterationCount = 1;
                wheel.SlidingFriction.SolverSettings.MaximumIterationCount = 1;
                wheel.DrivingMotor.SolverSettings.MaximumIterationCount = 1;
            }

            Space = space;

            Space.Add(Vehicle);
            ModelDrawer = drawer;
            DisplayModel model;
            WheelModels = new List<DisplayModel>();
            for (int k = 0; k < 4; k++)
            {
                Vehicle.Wheels[k].Shape.Detector.Tag = "noDisplayObject";
                model = new DisplayModel(wheelModel, ModelDrawer);
                ModelDrawer.Add(model);
                WheelModels.Add(model);
                model.Texture = wheelTexture;
            }

            CameraControlScheme = new ChaseCameraControlScheme(Vehicle.Body, new Vector3(0, 0.6f, 0), true, 10, camera, game);
        }
 public BoneRelationship(Bone bone, Entity entity)
 {
     Bone = bone;
     Entity = entity;
     DisplayBone = null;
     LocalRotationBoneToEntity = Quaternion.Concatenate(entity.Orientation, Quaternion.Conjugate(bone.Orientation));
 }