How to set the curved surface visualization in HFSS

The accuracy of rendering true curves can be controlled by selecting View > Render > Curved Object Visualization.

This command offers two options: Maximum surface deviation and Maximum normal deviation. To improve image quality, you can reduce either or both of the allowed deviations. However, improved image quality increases CPU consumption. Changes apply to the current model until modified again, and any changes reset the default. The default settings offer a satisfactory balance between CPU/memory consumption and graphical display for various model complexities.

When you change Curved Object Visualization settings and apply them to a design, those settings are saved with the design unless changed again. This means when you reopen the design, it will apply the saved visualization settings, not the default settings. Because this affects the CPU and memory required to open the project, it is typically recommended not to save a project with settings other than the default.