1. Determine the desired 3D shape and its parameters (e.g., box dimensions, sphere radius).
2. Choose the appropriate Three.js geometry class (e.g., BoxGeometry, SphereGeometry, BufferGeometry).
3. Create the geometry object with the specified parameters.
4. Create a material for the geometry (e.g., MeshStandardMaterial).
5. Create a mesh by combining the geometry and material.
6. Add the mesh to the scene.
7. (Optional) Apply transformations (e.g., position, rotation, scale) to the mesh.
8. Render the scene.