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Table Of Contents
538 • CHAPTER 10
STRUCTURE MENU • 539
Construction Plane
This option is not linked to the Enable Snapping setting.
This option allows you to enable and disable the use of a construction plane. Using a construction
plane, you can constrain the creation of points and splines to a plane of your choosing. To create
a construction plane, choose Objects > Modeling > Construction Plane. If no construction plane
is present, the world grid (if enabled) is considered to be a construction plane. If there are several
construction planes in a scene, the topmost visible plane is used.
The construction plane is relevant only in the 3D, parallel and isometric views (i.e. all non-2D
views). When the Construction Plane option is enabled, newly created points or splines (including
their tangents) are created on the construction plane. The points can then be moved only on the
construction plane. This applies until the points are moved from the working plane by another tool
or by disabling the Construction Plane option.
The Construction Plane option is enabled by default and thus allows you to draw splines comfortably
in the 3D view. (With this option disabled, splines will be drawn freely in space.) There is an exception,
however. If the horizon is visible in the 3D viewport, then as long as you move a point beneath the
horizon, it remains on the construction plane. But if you move the point above the horizon, it will no
longer be xed on the construction plane and is free to move in height.
Snapping
Be careful not to have too many snapping options active at the same time. For example, if you want to
draw a spline on the surface of an object (see above) and both Polygon and Point are active, the new
points may often disappear behind the surface, since snapping is considering all points — including
those at the back of the target object.
Type
Three types of snapping are available: 2D, 2.5D and 3D.
Snap 3D
Use this mode for normal snapping. For example, if you snap a point to an edge, the point snaps
directly onto the edge. You can use this mode in the 2D viewports as well as in the 3D viewport.