/// <summary>
/// Returns the color id of the hitted face.
/// If the id == 0, then nothing was hit.
/// </summary>
/// <param name="gl"></param>
/// <param name="posX">The X position in the scene.</param>
/// <param name="posY">The Y position in the scene.</param>
/// <returns>The color id of the hitted face.</returns>
public uint DoHitTest(OpenGL gl, int posX, int posY )
{
// Ensure the hit test scene is up to date.
if (HtProgram.ChangedUniforms.Count == 0)
{
byte[] pixels = new byte[4];
gl.ReadPixels(posX, posY, 1, 1, OpenGL.GL_RGBA, OpenGL.GL_UNSIGNED_BYTE, pixels);
return new ColorF(pixels[3], pixels[0], pixels[1], pixels[2]).ToUint();
}
return 0;
}
