Make Object Look at Another Object
Maya 2012 Tutorial
How to Make One Object Look at Another Object in Maya
You may have two objects in your scene and you want one object to "watch" and follow the movement of the second object. It may be an eye ball watching some action or a sea of faces watching a tennis game.
For this example we will add two primitives (a cone and a cube) to the stage and have the cone watch the movement of the cube.
Add a primitive cone and cube to the workspace by choosing Create > Polygon Primitives > Cone then Create > Polygon Primitives > Cube.
Using the Channel Box, move the cube to -12 in the x direction and -12 in the z direction.
Using the Rotate tool (e key) rotate the cone so it is pointing at the cube.
Select the cube, then shift select the cone ( the order is important) and choose Constrain > Aim from the Animation menu set. Be sure to include the options.
In the dialog box, choose Edit > Reset Settings and click the Maintain Offset checkbox. Click the Add button.
Using the Move tool (w key) drag the cube and notice that the cone follows it's movement.