How can I make a plane always look at camera? Like in old videogames, like Doom or Wolfenstein, this kind of software used static images that always looked at the camera, is this possible to make on Blender Cycles?
I think I know what you're talking about (cause I'm a huge fan of these kind of oldschool 3d-imitating games :)). You may use a Damped Track constraint.
Select the plane, go to Constraints header, select a Damped Track constraint and set the Camera as a Target. Then select an axis you want a plane to lie on.
If you move the plane in any direction it'll always face the camera. Remember that you may also decrease the Influence of this constraint for different results.
I'm not sure this is what you're looking for, but there is an add-on called Create camera image plane that creates a plane that always fills the frame, is always parallel to the camera and moves with it.
Here's a link to the original thread on where you can download it in blenderartists. (login is required to download attachments)
I found a solution to this, first select the Plane you want to track with the camera, and then the Object Constraints option, select 'Copy Rotation'
After that, select the Camera in the list next to the orange cube icon, and then just move the camera as usual, the camera will work as normally do but with a plane following automatically.
Also, first be sure to put the plane in front of the camera as you want to show it.