The best way to set up an axis 3D model is to define a clear, consistent coordinate system aligned with your project’s purpose and 3D software conventions.
Choose a standard orientation (e.g., X-Y for horizontal planes, Z for vertical) that matches how you’ll use the model—like Z-up for architecture (to represent height) or Y-up for game characters (to align with engine defaults).
Start with your software’s default axis setup (e.g., Blender uses Z-up, Maya uses Y-up) if you’re new—this minimizes confusion and prevents alignment errors.