/// <summary>
/// Loads all the content necessary for drawing Gizmos.
/// </summary>
/// <param name="device">The GraphicsDevice to use when drawing. It is also used to bind buffers.</param>
/// <param name="content">The ContentManager to manage Gizmos resources.</param>
public void LoadContent(GraphicsDevice device)
{
GraphicsDevice = device;
Content = TGCGame.Instance.Content;
Effect = Content.Load <Effect>("Effects/Gizmos");
BackgroundPass = Effect.CurrentTechnique.Passes["Background"];
ForegroundPass = Effect.CurrentTechnique.Passes["Foreground"];
WorldViewProjectionParameter = Effect.Parameters["WorldViewProjection"];
ColorParameter = Effect.Parameters["Color"];
LineSegment = new LineSegmentGizmoGeometry(GraphicsDevice);
Cube = new CubeGizmoGeometry(GraphicsDevice);
Sphere = new SphereGizmoGeometry(GraphicsDevice, 20);
PolyLine = new PolyLineGizmoGeometry(GraphicsDevice);
Disk = new DiskGizmoGeometry(GraphicsDevice, 20);
Cylinder = new CylinderGizmoGeometry(GraphicsDevice, 20);
//AxisLines = new AxisLines(GraphicsDevice, Content.Load<Model>("3D/geometries/arrow"));
DrawInstances[LineSegment] = new Dictionary <Color, List <Matrix> >();
DrawInstances[Sphere] = new Dictionary <Color, List <Matrix> >();
DrawInstances[Cube] = new Dictionary <Color, List <Matrix> >();
DrawInstances[Disk] = new Dictionary <Color, List <Matrix> >();
DrawInstances[Cylinder] = new Dictionary <Color, List <Matrix> >();
}
/// <summary>
/// Draws a wire disk (a circle) with an origin and normal direction using the specified color.
/// </summary>
/// <param name="origin">The position of the disk.</param>
/// <param name="normal">The normal direction of the disk, assumed normalized. It will face this vector.</param>
/// <param name="radius">The radius of the disk in units.</param>
/// <param name="color">The color of the disk.</param>
public void DrawDisk(Vector3 origin, Vector3 normal, float radius, Color color)
{
var world = DiskGizmoGeometry.CalculateWorld(origin, normal, radius);
AddDrawInstance(Disk, color, world);
}