Tail/motion blur in 3d enviroment

I’d like to give a 3d curve a Tail/motion blur. I saw a method to generate a 2d Tail by adding a rectangle in the background upon which you draw the tail. Is there a possibility to draw a rectangle in the background, that stays relative to the camera, or is there another possibility to give a 3d object a tail?

you can create a rectangle that stays relative to the camera with Quad (DX9) (click the link to read how).

i think your ‘tail’ could be created by either feedback (drawing the renderer output onto a quad that is connected to the same renderer) or by turning off clearing on the renderer and accomplish the fading by drawing a transparent quad over the scene.