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Using radial menus
Houdini associates a custom menu with each desktop. For example, if you switch to the Modeling desktop, the C key will show a menu with modeling tools. The generic Build desktop has a menu with lots of generally useful tools.
You can also switch to different menus at any time using the Radial switching menu. For example, there are specialized modeling menus for curve modeling, polygonal modeling, and UV Editing.
Normally when you switch desktops, Houdini switches the C key to the custom radial menu associated with that desktop. You can "pin" the current radial menu so it doesn’t change with the desktop by opening the Radial switching menu and turning on Pin current menu at the bottom.
Creating and editing menus
Tips and notes
If you have fewer than eight items on a menu, the "hit area" of the items next to the "gaps" get bigger to fill in. This means in menus with fewer items, the items are easier to hit.
You can show a menu programmatically using hou.SceneViewer.displayRadialMenu(). Note that the menu will open under the mouse pointer.