Billboard DX11 with same size regardless of FOV

Hi, i tried to use the billboard/SelfAlign Node/Shader to get a Quad, which position is affected by the Camera and the FOV, without changing the rendered size of the Quad. So far i only managed to get the SelfAlign to work, so the Quads are all facing to my Camera but their size get affected by the FOV of Camera. In DX9 this is simply done with the Billboard Tag - Is there any possibility to do this in DX11?

billboard.zip (4.7 kB)

got a solution with the WithinProjection and a 3D to 2D Conversion - mabye not the best solution but it works for the moment.

billboard_2.v4p (21.1 kB)