/// <summary>
/// Pick geometry at specified positon.
/// </summary>
/// <param name="x">Left Down is (0, 0)</param>
/// <param name="y">Left Down is (0, 0)</param>
/// <param name="geometryType"></param>
/// <returns></returns>
public PickedGeometry Pick(int x, int y, GeometryType geometryType)
{
PickedGeometry pickedGeometry = null;
Framebuffer framebuffer = GetPickingFramebuffer();
framebuffer.Bind();
{
const float one = 1.0f;
GL.Instance.ClearColor(one, one, one, one);
GL.Instance.Clear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT | GL.GL_STENCIL_BUFFER_BIT);
var arg = new PickingEventArgs(this.Scene, x, y, geometryType.ToFlags());
this.RenderForPicking(this.Scene.RootElement, arg);
uint stageVertexId = ColorCodedPicking.ReadStageVertexId(x, y);
pickedGeometry = Pick(stageVertexId, arg, this.Scene.RootElement);
}
framebuffer.Unbind();
return(pickedGeometry);
}
/// <summary>
/// Pick geometry at specified positon.
/// </summary>
/// <param name="x">Left Down is (0, 0)</param>
/// <param name="y">Left Down is (0, 0)</param>
/// <param name="geometryType"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <returns></returns>
public PickedGeometry Pick(int x, int y, GeometryType geometryType, int width, int height)
{
return(Pick(x, y, geometryType.ToFlags(), width, height));
}