create 2 surfaces for one object

[Kevin Camp]

one way would be to duplicate the shape, change it’s color and offset the duplicate a fraction of a pixel in z-space. then parent it to the original. as you rotate the original you should see the duplicate on the backside.

another way is to use an expression to change the color when the layer faces away from the viewer/camera. you can use this expression (from .motionscript.com) in the ‘source opacity’ property of the ‘solid composite’ effect to effectively change the color of a layer when it faces away from the camera:

if (toCompVec([0, 0, 1])[2] > 0 ) 100 else 0

you could also change the actual color of say a shape layer, or color property in an effect by creating 2 keyframes for that property (one for each color) and modifying the expression to this:

if (toCompVec([0, 0, 1])[2] > 0 ) f=2 else f=1;
key(f).value
it is just displaying the color from one key frame when the layer faces the camera, and the other when it faces away.

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW

[Kate Koyama]

where to you turn on the collapse switch??

[Kate Koyama]

I nested the comp and made the new comp 3d but it didn’t work…

[Kate Koyama]

oh never mind I did a search on after effects and it worked!!! thanks!!