/// <summary>
/// Create a JMousePicker instance. JMousePicker will project a 2D screen coordinate into a 3D unit vector within the world.
/// It can determine intersection with terrain as well as check for intersection with a JBoundingSphere.
/// </summary>
/// <param name="camera">The JCamera entity.</param>
/// <param name="projectionMatrix">The JMasterRenderers Projection Matrix based off of the JCameras properties.</param>
/// <param name="terrain">The JTerrain the Mouse Ray will intersect with.</param>
/// <param name="gameWindow">The active JGameWindow. We need this to get it's height and width.</param>
public JMousePicker(JCamera camera, Matrix4 projectionMatrix, JPerlinTerrain terrain, JGameWindow gameWindow)
{
Camera = camera;
ProjectionMatrix = projectionMatrix;
ViewMatrix = JMathUtils.createViewMatrix(camera);
Terrain = terrain;
GameWindow = gameWindow;
}
/// <summary>
/// Update CurrentRay each frame from the current 2D mouse coordinate. Also updates CurrentTerrainPoint reflecting CurrentRays intersection with
/// Terrain.
/// </summary>
public void Update()
{
ViewMatrix = JMathUtils.createViewMatrix(Camera);
CurrentRay = CalculateMouseRay();
if (IntersectionInRange(0, JConfig.MOUSE_PICKER_RAY_RANGE, CurrentRay))
{
CurrentTerrainPoint = BinarySearch(0, 0, JConfig.MOUSE_PICKER_RAY_RANGE, CurrentRay);
}
else
{
CurrentTerrainPoint = new Vector3(0, 0, 0);
}
}
