9.5.2

540 • CHAPTER 10
STRUCTURE MENU • 541
Point
If this option is enabled, the source is snapped to the points of the active or other objects. All visible,
polygonal objects and splines in the scene are considered. Because primitives have no points, they
cannot be considered as snap targets for this option.
Edge
Points have higher snapping priorities than edges.
With this option enabled, the source is snapped to polygon edges. All visible, polygonal objects in
the scene are considered.
Polygon
If you enable this option, the source is snapped to the surface of the target polygon. All visible
polygonal objects in the scene are considered. This is particularly well suited to drawing splines on
to polygon objects, for example. To do this you should disable all other options and use Snap 3D. If
you now create (or move) the points of the splines, they are snapped automatically to the polygons
behind the spline.
Polygon Center
With this option enabled, the source will be snapped to the center of the target polygon.
Midpoint
Use this option together with other options to, for example, snap to the midpoint of a polygon edge
or to the centre of the spline distance between two points.
Grid
With this option enabled, the source is snapped to the grid points of the construction plane.
Gridline
The source snaps to the construction plane’s grid lines when this option is enabled.
Tangent
This option makes sense only if you want to let a spline curve (at a point just edited) snap tangentially
on to another, target, spline. This option can be very time-consuming.