you select JUST the face you want to animate the color change too.
Then assign the material you are keying to JUST that face
You assign a different material to the rest of the mesh
As a test do this so you understand what is happening.
1. create a poly cube
2. create 2 blinn materials
3. make one material green and the other red
4. assign the green mat to the entire object
5. pick just ONE face and right click on the red mat in the hypershade window and click "assign to selected"
You should now have a cube with 5 sides that are green and one side that is red!
6. now go to the red materials attributes, right click to the left of the word "color" and key the red color at frame 1
7. move the time slider to frame 100
8. go to the RED color materials attributes and change it's color to BLUE
9. right click to the right of the word "color" and key the BLUE color at frame 100
Now when to slide the time slider from 1 to 100 the single polygon with the RED shader with change from RED at frame 1 to BLUE at frame 100
"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675
Last edited by ctbram; 23-07-2012 at 02:55 PM.