If you want to take your After Effects projects to the next level by incorporating 3D models and animations, using .obj files is a great option. Here's a step-by-step guide on how to use obj in After Effects:

1. Import the .obj File:

- Open After Effects and create a new composition.

- Go to File > Import > File and select the .obj file you want to use.

- After Effects will automatically import the .obj file along with its texture maps.

2. Set up the 3D Scene:

- Once the .obj file is imported, you'll notice a new composition layer in the timeline.

- Select the 3D layer and go to the Effect Controls panel.

- Under the Geometry Options, you can adjust the scale, position, and rotation of the 3D model to fit your scene.

3. Apply Materials and Textures:

- If your .obj file came with texture maps, you can apply them to the 3D model in After Effects.

- Select the 3D layer and go to the Effect Controls panel.

- Under the Material Options, you can map the texture files to your 3D model for a realistic look.

4. Animate the 3D Model:

- After setting up the 3D scene and applying materials, you can start animating the 3D model in After Effects.

- Use keyframes to animate the position, rotation, and scale of the 3D layer over time.

- You can also use built-in plugins like Element 3D or Cinema 4D to add more advanced animations and effects to your 3D model.

5. Render and Export:

- Once you're satisfied with the 3D animation, it's time to render and export your composition.

- Go to Composition > Add to Render Queue and adjust the settings according to your project requirements.

- After Effects will render the composition with the 3D model and produce a high-quality video file for your use.

Using .obj files in After Effects opens up a world of possibilities for creating stunning 3D animations, motion graphics, and visual effects. With the right techniques and creativity, you can bring your ideas to life in ways that were previously unimaginable. Experiment with different 3D models, textures, and animations to unleash your full creative potential in After Effects.