Comment animer un escalier 3D dans After Effects

Introduction

You can create a stylized 3D staircase directly in After Effects by combining text layers, masks, and 3D transformations. This technique is useful for typographic animations, abstract motion graphics, and creative transitions.

Step 1: Create a New Composition

Go to Composition > New Composition and set your preferred resolution, frame rate, and duration. Step 2: Create and Customize the Text

Use the Type Tool (Ctrl/Cmd + T) to create your text. Customize the font, size, and spacing using the Character panel.

Step 3: Pre-compose the Text Layer

Select the text layer, right-click, and choose Pre-compose. Move all attributes into the new composition and name it appropriately.

Step 4: Create a Mask for the First Step

Select the pre-composition layer and use the Rectangle Tool (Q) to create a mask covering half of the text. Set the Mask Mode to Add.Step 5: Duplicate and Invert the Mask

Duplicate the pre-comp layer. For the duplicated layer, change the Mask Mode to Subtract. This splits the text into two separate sections. Step 6: Add a Camera and Enable 3D Layers

Go to Layer > New > Camera. Enable the 3D Layer switch for all text pre-comps. Step 7: Rotate the Step

Select the duplicated pre-comp and set its X Rotation to –90°. This creates the vertical face of the stair.

Step 8: Adjust the Camera View

Use the Orbit Around Cursor Tool (C) to rotate the camera view. Position the camera so the text clearly appears as a 3D stair shape.Step 9: Build the Staircase

Duplicate the paired pre-comp layers multiple times. Offset their Position values to stack them and form a staircase.Step 10: Add Light Sweep for Highlights

Apply the CC Light Sweep effect from the Effects & Presets panel to enhance surface highlights and depth.

Step 11: Optional Lighting and Preview

Optionally, add a Spot Light to increase depth and realism. Preview the animation and fine-tune camera angles and lighting as needed.

Conclusion

By combining text layers, masks, 3D transformations, and camera movement, you can create a dynamic 3D stairs animation entirely within After Effects. This method works well for typographic reveals, abstract motion design, and creative visual storytelling.