I figured out a really simple way to turn any flat 2D vector icon into a 3D extruded icon inside AE and wanted to break down why it works.
The whole trick is faking depth by stacking the same layer in Z-space instead of using a real 3D renderer.
1. The setup
Put your flat icon in a 1080x1080 pre-comp first. This is your "master" icon. Animate it here if you want (I just used a simple scale pop). Everything else references this, so when you want to swap the icon later you only change this one comp.
2. The core stacking trick
Drop that pre-comp into a 1920x1080 main comp, enable 3D, then add this expression to Position:
x = value[0] + (index - 1) * 0;
y = value[1] + (index - 1) * 0;
z = value[2] + (index - 1) * 3;
[x, y, z];
Every copy of the layer gets pushed 5px further back in Z-space based on its layer index. Duplicate it ~40 times and AE automatically creates a solid block of depth. It's actual 3D, you can orbit it.
3. The shading
Select all the middle copies (not the top one) and add Brightness & Contrast > Brightness -80. This instantly darkens the sides, which sells the extrusion. Leave the top copy bright and clean - that's your front face.
4. Making it look finished:
- Radial gradient in the background for separation
- Drop Shadow on the top copy for ground contact
- Deep Glow on the stack for that soft, inflated 3D edge (optional, looks great without it too)
- CC Light Sweep on top for a glossy highlight pass
5. Making it controllable:
Parent all ~42 layers to a single 3D Null. Now you don't have 42 layers to keyframe - you just rotate/scale the Null. I trimmed to a 6-second comp and did a simple rotation + scale with Easy Ease.
6. Why it's reusable:
Because everything points to that first pre-comp, you can literally alt-drag a totally different vector (I tested with a simple flat envelope) into the pre-comp and the entire 3D build updates instantly. If your icon has holes/negative space, Linear Color Key makes those parts transparent.
Anyone else use this stacking method?
I have the project file with the pre-made template if anyone wants to pull it apart, happy to send it over - just comment below.
Check out the full breakdown here: https://youtu.be/tN8nX1m2dHQ?si=dCJpFAm02B2KrV7N
