In Rhino, proxy objects are simplified representations of complex 3D geometry. While they are useful for improving viewport performance, there are situations where you may need to convert them to regular mesh to perform advanced modeling or design tasks. Here's how you can change proxy objects to regular mesh in Rhino:

1. Select the Proxy Object: Begin by selecting the proxy object that you want to convert to a regular mesh. You can identify proxy objects by their simplified appearance in the viewport.

2. Convert to Mesh: Once the proxy object is selected, navigate to the 'Mesh' tab in the command line or use the 'Mesh' command. Rhino offers various meshing options, such as 'Mesh', 'PolygonMesh', and 'MeshPatch'. Choose the appropriate option based on the complexity of the proxy object.

3. Adjust Mesh Settings: After initiating the meshing process, Rhino provides you with the option to adjust mesh settings such as density, smoothness, and edge settings. These settings allow you to fine-tune the mesh to meet your specific design requirements.

4. Confirm and Convert: Once you are satisfied with the mesh settings, confirm and convert the proxy object to regular mesh. Rhino will generate a regular mesh representation of the original proxy object, allowing you to work with the detailed 3D geometry.

5. Further Refinement: Depending on your project needs, you may need to further refine the regular mesh using Rhino's modeling tools. This includes operations such as editing vertices, edges, and faces, or applying modifiers to achieve the desired shape and form.

By following these steps, you can effectively change proxy objects to regular mesh in Rhino, enabling you to leverage the full capabilities of 3D modeling and design within the software. Whether it's for architectural visualization, product design, or digital fabrication, having access to detailed regular meshes empowers you to create intricate and accurate 3D models for your projects.