Thanks for response and taking care this much!
My logo look normal before turing to 3D. when I turn it to 3D it turns uncompatible with camera!
and when i move the camera, it stretchs from the front side to the camera angle !
-what is exactly on my mind is in this intro by WB :
*watch the seconds between 40'' to 50''
-I want to show my logo (instead of "THE LEGEND OF THE GUARDIAN" with a sun like light source behind it (with light rays crossing the logo characters) and moving the camera around the logo.
-I just followed this tutorial by Mr Kramer (sorry i forgot to put the link)
-I created 2D logo with photoshop and made it 3D with element 3D.
Remember that Element is really a 2D effect that renders a scene from the same perspective as the comp camera. It cannot interact with Ae's 3D features like intersections and lights.
If I understand your problem correctly, you need a 3D layer to interact with the scene as Andrew describes in the tutorial, plus a 2D Element layer to interact with the camera.
I'd suggest that you enable your mask source layer, make it 3D, and align it perfectly with Element model. In Element, create a Group Null for the logo. Make the 3D mask source layer a child of the Group Null -- now you've got one control for animating the position of both the 3D mask source layer and the Element group, so you can move them together. The 3D mask source layer will interact with the scene, casting shadows in Ae's 3D space, and the Element layer will provide the depth and texture you're looking for, and will (hopefully) completely cover the underlying 3D mask source layer.