/// <summary>
/// Creates a new cylinder cast based wheel shape.
/// </summary>
/// <param name="radius">Radius of the wheel.</param>
/// <param name="width">Width of the wheel.</param>
/// <param name="localWheelOrientation">Unsteered orientation of the wheel in the vehicle's local space.</param>
/// <param name="localGraphicTransform">Local graphic transform of the wheel shape.
/// This transform is applied first when creating the shape's worldTransform.</param>
/// <param name="includeSteeringTransformInCast">Whether or not to include the steering transform in the wheel shape cast. If false, the casted wheel shape will always point straight forward.
/// If true, it will rotate with steering. Sometimes, setting this to false is helpful when the cast shape would otherwise become exposed when steering.</param>
public CylinderCastWheelShape(float radius, float width, Quaternion localWheelOrientation, Matrix localGraphicTransform, bool includeSteeringTransformInCast)
{
shape = new CylinderShape(width, radius);
this.LocalWheelOrientation = localWheelOrientation;
LocalGraphicTransform = localGraphicTransform;
this.IncludeSteeringTransformInCast = includeSteeringTransformInCast;
}
/// <summary>
/// Draws the display object.
/// </summary>
/// <param name="viewMatrix">Current view matrix.</param>
/// <param name="projectionMatrix">Current projection matrix.</param>
public override void Draw(Matrix viewMatrix, Matrix projectionMatrix)
{
//This is not a particularly fast method of drawing.
//It's used very rarely in the demos.
model.CopyAbsoluteBoneTransformsTo(transforms);
for (int i = 0; i < Model.Meshes.Count; i++)
{
for (int j = 0; j < Model.Meshes[i].Effects.Count; j++)
{
var effect = Model.Meshes[i].Effects[j] as BasicEffect;
if (effect != null)
{
effect.World = transforms[Model.Meshes[i].ParentBone.Index] * MathConverter.Convert(WorldTransform);
effect.View = MathConverter.Convert(viewMatrix);
effect.Projection = MathConverter.Convert(projectionMatrix);
effect.AmbientLightColor = Color;
if (Texture != null)
{
effect.TextureEnabled = true;
effect.Texture = Texture;
}
else
effect.TextureEnabled = false;
}
}
Model.Meshes[i].Draw();
}
}
public JointForceWeld(Entity one, Entity two)
{
One = one;
Two = two;
Matrix worldTrans = Matrix.CreateFromQuaternion(One.GetOrientation()) * Matrix.CreateTranslation(One.GetPosition().ToBVector());
Matrix.Invert(ref worldTrans, out worldTrans);
Relative = (Matrix.CreateFromQuaternion(two.GetOrientation())
* Matrix.CreateTranslation(two.GetPosition().ToBVector()))
* worldTrans;
}
/// <summary>
/// Sets the direction of the entity.
/// </summary>
/// <param name="rot">The new angles.</param>
public override void SetOrientation(Quaternion rot)
{
if (Body != null)
{
Body.Orientation = rot;
}
else
{
WorldTransform = Matrix.CreateFromQuaternion(rot) * Matrix.CreateTranslation(WorldTransform.Translation);
}
}
/// <summary>
/// Destroys the body, removing it from the physics world.
/// </summary>
public virtual void DestroyBody()
{
LVel = new Location(Body.LinearVelocity);
AVel = new Location(Body.AngularVelocity);
Friction = GetFriction();
// TODO: Gravity = new Location(Body.Gravity.X, Body.Gravity.Y, Body.Gravity.Z);
WorldTransform = Body.WorldTransform;
for (int i = 0; i < Joints.Count; i++)
{
if (Joints[i] is BaseJoint)
{
BaseJoint joint = (BaseJoint)Joints[i];
TheRegion.PhysicsWorld.Remove(joint.CurrentJoint);
}
}
TheRegion.PhysicsWorld.Remove(Body);
Body = null;
}
/// <summary>
/// Updates the display object.
/// </summary>
public override void Update()
{
WorldTransform = LocalTransform * Entity.WorldTransform;
}
/// <summary>
/// LoadContent will be called once per game and is the place to load
/// all of your content.
/// </summary>
protected override void LoadContent()
{
//This 1x1x1 cube model will represent the box entities in the space.
CubeModel = Content.Load <Model>("cube");
PlaygroundModel = Content.Load <Model>("playground");
//Construct a new space for the physics simulation to occur within.
space = new Space();
//Set the gravity of the simulation by accessing the simulation settings of the space.
//It defaults to (0,0,0); this changes it to an 'earth like' gravity.
//Try looking around in the space's simulationSettings to familiarize yourself with the various options.
space.ForceUpdater.Gravity = new Vector3(0, -9.81f, 0);
//Make a box representing the ground and add it to the space.
//The Box is an "Entity," the main simulation object type of BEPUphysics.
//Examples of other entities include cones, spheres, cylinders, and a bunch more (a full listing is in the BEPUphysics.Entities namespace).
//Every entity has a set of constructors. Some half a parameter for mass, others don't.
//Constructors that allow the user to specify a mass create 'dynamic' entiites which fall, bounce around, and generally work like expected.
//Constructors that have no mass parameter create a create 'kinematic' entities. These can be thought of as having infinite mass.
//This box being added is representing the ground, so the width and length are extended and it is kinematic.
Box ground = new Box(Vector3.Zero, 30, 1, 30);
space.Add(ground);
//Now that we have something to fall on, make a few more boxes.
//These need to be dynamic, so give them a mass- in this case, 1 will be fine.
space.Add(new Box(new Vector3(0, 4, 0), 1, 1, 1, 1));
space.Add(new Box(new Vector3(0, 8, 0), 1, 1, 1, 1));
space.Add(new Box(new Vector3(0, 12, 0), 1, 1, 1, 1));
//Create a physical environment from a triangle mesh.
//First, collect the the mesh data from the model using a helper function.
//This special kind of vertex inherits from the TriangleMeshVertex and optionally includes
//friction/bounciness data.
//The StaticTriangleGroup requires that this special vertex type is used in lieu of a normal TriangleMeshVertex array.
Vector3[] vertices;
int[] indices;
ModelDataExtractor.GetVerticesAndIndicesFromModel(PlaygroundModel, out vertices, out indices);
//Give the mesh information to a new StaticMesh.
//Give it a transformation which scoots it down below the kinematic box entity we created earlier.
var mesh = new StaticMesh(vertices, indices, new AffineTransform(new Vector3(0, -40, 0)));
//Add it to the space!
space.Add(mesh);
//Make it visible too.
Components.Add(new StaticModel(PlaygroundModel, mesh.WorldTransform.Matrix, this));
//Hook an event handler to an entity to handle some game logic.
//Refer to the Entity Events documentation for more information.
Box deleterBox = new Box(new Vector3(5, 2, 0), 3, 3, 3);
space.Add(deleterBox);
deleterBox.CollisionInformation.Events.InitialCollisionDetected += HandleCollision;
//Go through the list of entities in the space and create a graphical representation for them.
foreach (Entity e in space.Entities)
{
Box box = e as Box;
if (box != null) //This won't create any graphics for an entity that isn't a box since the model being used is a box.
{
Matrix scaling = Matrix.CreateScale(box.Width, box.Height, box.Length); //Since the cube model is 1x1x1, it needs to be scaled to match the size of each individual box.
EntityModel model = new EntityModel(e, CubeModel, scaling, this);
//Add the drawable game component for this entity to the game.
Components.Add(model);
e.Tag = model; //set the object tag of this entity to the model so that it's easy to delete the graphics component later if the entity is removed.
}
}
}
/// <summary> /// Draws the display object. /// </summary> /// <param name="viewMatrix">Current view matrix.</param> /// <param name="projectionMatrix">Current projection matrix.</param> public abstract void Draw(Matrix viewMatrix, Matrix projectionMatrix);
