Creating a 3D viewer in Roblox can bring your game assets and environments to life, allowing players to explore and interact with them in a new way. Here's a step-by-step guide on how to make a 3D viewer in Roblox:

1. 3D Modeling: First, create or download 3D models of the assets or environments you want to showcase in your 3D viewer. You can use software like Blender or Cinema 4D to create your 3D models, then export them as .obj or .fbx files.

2. Importing to Roblox: Once you have your 3D models, import them into Roblox Studio. Go to the 'Model' tab and click 'Import' to upload your .obj or .fbx files. You can then position and scale the models within your Roblox game environment.

3. Scripting: Use Lua scripting in Roblox to create interactivity for your 3D viewer. You can add scripts to allow players to move and rotate the camera around the 3D models, zoom in and out, and interact with the environment.

4. User Interface: Design a user interface for your 3D viewer, including buttons or controls for navigating the 3D space, changing camera perspectives, and interacting with the models. You can use Roblox's UI editor to create and customize the interface elements.

5. Testing and Refinement: Test your 3D viewer in Roblox Studio to ensure that the camera controls and interactivity work as intended. Make any necessary adjustments to the scripting and user interface based on testing feedback.

6. Publishing: Once you're satisfied with your 3D viewer, you can publish it to the Roblox platform for others to experience. You can add it to your game as a separate interactive space or integrate it into the main gameplay environment.

By following these steps, you can create a captivating 3D viewer in Roblox that showcases your game assets and environments in an immersive and interactive way. Whether you're a game developer, 3D modeler, or just eager to explore new possibilities in Roblox, a 3D viewer can enhance the player experience and bring your virtual world to life.