HFSS15: Snap Setting Guidelines

For each object (3D, 2D, or 1D), you can define snapping points. Then, when moving in the Modeler window, if the cursor approaches a snap point (gets closer in terms of screen coordinates, not 3D coordinates), the snap point is highlighted. If you then click it, it becomes selected, even if that point is out of the plane you are working in (for example, even if the point has 3D coordinates when you are working in a 2D plane).

In general, select at least one of the snap options in the Snap Mode window. If none of these options are selected, the software is in "free mode" and selects whatever point you click, regardless of its coordinates. This can cause problems when you are trying to create closed objects. Although the point you select may appear to be the vertex point of an open object, you may not have actually clicked the exact coordinates of the point.