CAD > Snap > Cursor/Grid Setup

Setup the cursor/grid location, spacing and orientation.

X, Y and Z Origin - specifies the coordinates of the centre of the grid.

Pick - activates the cursor cross-hairs allowing interactive selection of the cursor/grid base from the model.

Spacing - specifies the distance between grid points.

Angle - specifies the angle (in degrees) between the radii of the cylindrical grid.

# Intervals - specifies the number of grid points that will be displayed.

CAD > Snap > XY Cursor - constrains the cursor cross-hairs and snap grid to the X-Y plane.

CAD > Snap > YZ Cursor - constrains the cursor cross-hairs and snap grid to the Y-Z plane.

CAD > Snap > XZ Cursor - constrains the cursor cross-hairs and snap grid to the X-Z plane.

CAD > Snap > User defined Cursor - constrains the cursor cross-hairs and snap grid to the user defined plane.

The user defined coordinate system is only active with rectangular and circular grid snapping ( CAD > Snap > Grid Snap and CAD > Snap > Cylinder Snap).

The user defined plane is specified by its dip (φ), dip direction (ϑ) and rake (α) such that:

•Pnt on X - The local x-axis (x') is defined along the strike of the plane. A point on this axis can be selected using this function.

•Pnt on Y - The local y-axis (y') is defined as down dip. A point on this axis can be selected using using this function.

•The local z-axis is perpendicular to the plane.

•Norm - activates the cursor allowing interactive selection of a surface to make the local UCS plane parallel to. The dip and dip direction of the plane will be set normal to the selected surface.  

•Rake - allows for rotation of X' around the local z-axis.

For an example on the use of grid snap mode in model building refer to

Freehand Sketching - Room and Pillar.