How to Build an Automated 3D Carousel in After Effects

Creating a rotating 3D console or card carousel is a staple in modern UI motion graphics. But manually animating the scale, position, and color of every single card as it moves to the front is a tedious process. In this tutorial, we will build a fully automated 3D Carousel using After Effects Expressions.

1 Setting Up the Cards & Controller

First, create your main composition (1920x1080). Then, create a separate "Card" composition (e.g., 500x673) and drop your image inside. Fit the image to the comp, create a rectangle mask with a roundness of 25, and apply it so the card looks polished.

Bring the Card comp into the Main comp. Add a Null Object, name it Card Controller, and make both layers 3D.

The 3D Rigging Trick

Change your view to Top View. Move the Card Controller backward in Z-space (behind the card). Go back to Active Camera, parent the Card to the Card Controller, and turn on Auto-Orient Towards Camera (Right-Click -> Transform -> Auto-Orient). Now, when you rotate the Controller's Y-axis, the card swings in a wide arc but always faces you.

2 Distributing the Carousel (The Math)

We need 5 total copies of the card. A full circle is 360 degrees. If we divide 360 by 5, we get 72 degrees.

• Duplicate the card, unparent it temporarily, rotate the Controller by +72°, and parent the card back.
• Repeat this process, adding 72° each time, until all 5 cards form a perfect circle around the Controller.
• Hold Alt and drag your other image assets from the project panel onto the duplicated comps in the timeline to instantly replace them!

3 The Magic Scale Expression

We want the card closest to the camera to be the largest. Create a 3D Camera and enable Depth of Field (set Aperture to 700 so the background blurs heavily). Now, Alt-click the Scale stopwatch on a card and paste this expression:

cam = thisComp.activeCamera;

// Distance from camera
d = length(toWorld(anchorPoint), cam.toWorld([0,0,0]));

// Camera focus distance
fd = cam.focusDistance;

// How wide the focus area is (adjust this)
range = 300;

// Scale values
minScale = 90;
maxScale = 140;

// Calculate how close to focus
diff = Math.abs(d - fd);

// Map the values
s = ease(diff, 0, range, maxScale, minScale);

[s, s, s]

How it works: The expression measures the distance between the card and the camera's focus distance. If it is in focus, it scales to 140%. If it moves away, it eases down to 90%. Right-click this Scale property, select "Copy Expression Only", and paste it to all other cards.

4 The Desaturation (Tint) Expression

To make the out-of-focus background cards turn black and white, select all cards and apply the Tint effect. We will map the "Amount to Tint" property using the same camera math.

Alt-click the "Amount to Tint" stopwatch and paste this expression:

cam = thisComp.activeCamera;

// Distance from camera
d = length(toWorld(anchorPoint), cam.toWorld([0,0,0]));

// Focus distance
fd = cam.focusDistance;

// Focus range (adjust this)
range = 300;

// Calculate difference from focus
diff = Math.abs(d - fd);

// Map opacity
minO = 0;   // Front (in focus, 0% tint)
maxO = 100; // Back (out of focus, 100% tint)

ease(diff, 0, range, minO, maxO);

Now, whenever you rotate the Y-Rotation of the Null Controller, the cards will automatically spin into place, pop up in scale, regain their full color, and come into crisp camera focus — all simultaneously, without a single manual keyframe on the cards themselves!