= Construction plane =

== Overview ==

The grid shown in the viewer is the _construction plane_. Many modeling operations, such as creating a new objects using the tools in the Create shelf tab, are relative to the construction plane.

You can change the display of the grid on the construction plane, or move/reorient the construction plane to make it easier to model in an area not centered on the origin, or in a space other than the XZ ground plane.

== How to ==

The viewport options menu has three items for editing the construction plane.

[Image:/images/ui/viewport_menus_anno.png]

Construction plane parameters:
    This window lets you control how grid lines are drawn along the construction plane:
        
    - The spacing (in Houdini units) between grid lines.
    - The number of grid lines to draw.
    - How often to draw thicker grid lines ("rules").
    - The center point for the grid.
    
Construction plane handle:
    Turn on this option to show a handle that lets you quickly move and orient the construction plane in the viewer.
    
Set construction plane:
    This sub-menu contains many commands for snapping the construction plane to common orientations, re-centering the construction plane, and flipping the plane.
    
To return the construction plane to the default, open the viewport options menu and choose __Set construction plane > Rever to defaults__.