MGED CMD nmg

nmg design

Syntax

nmg subcommand object [suffix]

Arguments

object
Name for the primitive that you want to operate on.
subcommand
Command specified to alter an NMG object. Each has it's own set of arguments.

Subcommands

mm
Creates a new NMG model structure and fills the appropriate fields. The result is an empty model.
cmface
Generates a manifold face in the first encountered shell of the NMG object. Vertices are listed as the suffix and define the winding-order of the face. Faces require at least three specified vertices, each specified by three coordinates. In addition to creating a face, the subcommand will join edges of the new face with dangling edges of other faces in the same shell. This makes it easier for the application to generate topologically correct, closed, manifold objects.

Proposed subcommands

sface
Selects a face by highlighting it. Subsequent commands for manipulation or removal act on the selected face. By repeating this call, the currently selected face is advanced to the next face in the NMG object of the first encountered shell and region. If an optional point is specified, the subcommand finds the closest face to the point and selects that face instead.
deselect
Deselects all prior selected parts of the NMG object.
kface
Removes the geometry and faceuse of the currently selected face.

Return Value(s)

No Return Values for this command.

Description

The "nmg" command is a command for creating, adding geometry, and manipulating NMG objects in BRL-CAD. All operations are result in the addition of manifold geometry to the object.

Example(s)

mged> nmg mm box
Creates an empty nmg object.
mged> nmg cmface box 0 0 0 0 1 0 1 1 0 1 0 0
Creates 1st face of a six-faced box.
mged> nmg cmface box 1 0 1 0 0 1 0 1 1 1 1 1
Creates 2nd face of a six-faced box.
mged> nmg cmface box 0 0 0 0 1 0 0 1 1 0 0 1
Creates 3rd face of a six-faced box.
mged> nmg cmface box 0 1 0 1 1 0 1 1 1 0 1 1
Creates 4th face of a six-faced box.
mged> nmg cmface box 1 1 0 1 0 0 1 0 1 1 1 1
Creates 5th face of a six-faced box.
mged> nmg cmface box 0 0 0 0 0 1 1 0 1 1 0 0
Creates 6th face of a six-faced box.

See Also

NMG Editing project idea page
put for use with NMG objects
brep command
Wikipedia article on polygon mesh