Drag GameObject with mouse in just one axis

Hello Unity fellows,
I have a simple doubt, and already saw all the threads with the ‘mouse’ tag and cant find the answer.
Here is my problem:
I need to move one gameobject with the mousedrag operation, and i just want to move it in one specific direction. Some objects ill have to be moved in the Z axis, others in the X. But none in the Y.
My game is a 3D Game, and the camera ill look like this: http://i53.tinypic.com/2r76e6o.jpg
The camera ill be freezed, the only thing that ill move are these gameobjects.
Here is an example of how i want to move the objects: http://i51.tinypic.com/2h7hpj7.jpg

Can anyone help me with tips or even a finished script ?
Im making this game for a college project, so i dont have too many time to study programing (im a 3d modeler), but i can try some basic stuff :wink:
Sry my bad english too! Thanks in advance.

Hello,

Below’s a (java) script I used for moving gameObjects in just X-axis direction:

function OnMouseDrag()
{
   point = Camera.main.ScreenToWorldPoint(
   			Vector3(
   				Input.mousePosition.x,
   				(transform.position.y-Camera.main.transform.position.y),
   				(transform.position.z-Camera.main.transform.position.z)));

   point.y = transform.position.y;   				
   point.z = transform.position.z;
   transform.position = point;
}

Hope this is of assistance. I’m using a 2d orthographic camera and this solution works for my game - I’m not an experienced programmer either, but this approach could be used to also move items in Z-axis direction I believe.

X and Y worked fine, z didn’t work!