To view a 3D scene in After Effects, you can manipulate the camera and adjust the perspective to explore the depth of your composition. Here are some key steps to help you navigate and view your 3D scene effectively:

1. Enable 3D Layers: Before you can view a 3D scene, ensure that your layers are set to 3D. Select the layer and toggle the 3D layer switch to activate the 3D capabilities.

2. Switch to 3D View: In the Composition panel, select the 2-View or 4-View layout to switch to a 3D view. This will allow you to see your scene from different angles and perspectives.

3. Use the Camera Tool: After switching to a 3D view, select the Camera tool from the toolbar. This tool allows you to manipulate the camera position, angle, and zoom to adjust your view of the 3D scene.

4. Adjust the Camera Options: With the Camera tool selected, you can modify the camera's point of interest and position to control the perspective and depth of your composition. Experiment with different settings to find the most compelling view for your scene.

5. Set Keyframes for Animation: Once you have found the desired view of your 3D scene, you can set keyframes for the camera's position, point of interest, and other attributes to create dynamic camera movements and animations.

By following these steps, you can effectively view and navigate a 3D scene in After Effects to create engaging and visually appealing animations. Mastering the art of 3D scene viewing will allow you to bring depth and dimension to your motion graphics and visual effects projects.