/// <summary>
/// Finds the hits.
/// </summary>
/// <param name="viewport">The viewport.</param>
/// <param name="position">The position.</param>
/// <param name="hits">The hits.</param>
/// <returns></returns>
public static bool FindHits(this IViewport3DX viewport, Vector2 position, ref List <HitTestResult> hits)
{
hits?.Clear();
if (viewport.CameraCore is ProjectionCameraCore && viewport.RenderHost != null)
{
if (!viewport.UnProject(position, out var ray))
{
return(false);
}
if (hits == null)
{
hits = new List <HitTestResult>();
}
foreach (var element in viewport.Renderables)
{
element.HitTest(viewport.RenderHost.RenderContext, ray, ref hits);
}
hits.Sort();
return(hits.Count > 0);
}
else
{
return(false);
}
}
/// <summary>
/// Uns the project 2D point onto a 3D plane.
/// </summary>
/// <param name="viewport">The viewport.</param>
/// <param name="p">The p.</param>
/// <param name="position">The position.</param>
/// <param name="normal">The normal.</param>
/// <param name="intersection">The intersection.</param>
/// <returns></returns>
public static bool UnProjectOnPlane(this IViewport3DX viewport, Vector2 p, Vector3 position, Vector3 normal, out Vector3 intersection)
{
if (viewport.UnProject(p, out Ray ray))
{
return(ray.PlaneIntersection(position, normal, out intersection));
}
else
{
intersection = Vector3.Zero;
return(false);
}
}
