Slightly different behavior than ScreenSpaceGroup3D

Question

I am using a ScreenSpceGroup3D class in sharpDX for my model because I need independent from zoom always the same size. Independent from change the camera position the model is always visible (rotation graphic).

What can I do if another model is in the foreground that the ScreenSpaceGroup3D disappears?

I tried to solve my problem with the ScreenSpaceGroup3D. It did not lead to the desired result

Answer 1

I try again:

The Class what I use is ScreenSpacedGroup3D (it is a helix class).

I need to show a figure that always stays the same size when grafic will be zoomed. This behavior offers me the ScreenSpacedGroup3D. If another model moves in front of the position of the ScreenSpaceGroup3D models, the ScreenSpaceGroup3D model should be hidden (like Leyer). This is what I need.