Picking mode is used to select and drag objects in the viewer.
The mesh faces must be visible on an object or region to enable it
to be picked. Enter picking mode by selecting the Single
Select 
tool in a drop-down menu of the
viewer toolbar. If the Single Select icon is already visible, you can simply click
the New Selection 
icon.
You can also pick objects while still in viewing mode by holding down Ctrl+Shift as you click in the viewer.
There are several types of entities that you can select in the viewer, and which type you use depends on the context of what you are doing:
When you insert a primitive region, you need to use picking to select the mesh elements to put into the new primitive region.
When you add any sort of location (such as domain, sub-domain, or boundary condition), you can also use picking to select the 2D or 3D regions for these locations. To select a 3D region, you have to select all the 2D regions that are part of it. (CFX-Pre does not plot 3D regions directly; it plots only the associated 2D regions.)
When you need to select Cartesian coordinates for locations such as monitor points or source points, you can use picking to select the coordinates. Note that the coordinates selected always correspond to the location of the point in the global coordinate frame, Coord 0.
Use the mouse to select objects (for example, points and boundaries) from the viewer. When a number of objects overlap, the one closest to the camera is picked.
You can change the picking mode by selecting one of the toolbar icons:
- Single Select
Box Select 
Polygon Select
For details on the operation of the toolbar icons, see 3D Viewer Toolbar.