//###################################################################################################################
/// <summary>
/// Ray hit test in space from 2D coordinate of a camera field of view.
/// </summary>
/// <param name="camera"> the camera where the hit test start, UrhoSharp CullingCamera recommanded </param>
/// <param name="x"> ray position on x axis from left up corner of camera view, normalised value </param>
/// <param name="y"> ray position on y axis from left up corner of camera view, normalised value </param>
/// <returns> ray hit test information. If no collision detected is detected, return null </returns>
private RayQueryResult?RayHit(Camera camera, float x, float y)
{
Ray cameraRay = CullingCamera.GetScreenRay(x, y); // ray coresponding to center of field of view
// hit test using the previous ray
var result = Scene.GetComponent <Octree>().RaycastSingle(cameraRay, RayQueryLevel.Triangle, 100, DrawableFlags.Geometry, 0x70000000);
return(result);
}
//###################################################################################################################
protected override void OnUpdate(float timeStep)
{
Ray cameraRay = CullingCamera.GetScreenRay(0.5f, 0.5f); // ray coresponding to center of field of view
// hit test using the previous ray
var result = Scene.GetComponent <Octree>().RaycastSingle(cameraRay, RayQueryLevel.Triangle, 100, DrawableFlags.Geometry, 0x70000000);
if (result != null) // if the ray hit something
{
// display green sphere at ray hit position
sphere.Node.Position = result.Value.Position;
sphere.Color = Color.Green;
}
else
{
// display red sphere at max range of ray hit test
sphere.Node.Position = CullingCamera.Node.Position + CullingCamera.Node.Rotation * new Vector3(0, 0, 5);
sphere.Color = Color.Red;
}
}
