g-shell-rect — Produce triangulated shell from BRL-CAD model
g-shell-rect [-a rpp_args] [-R edge_tol] [-p plotfile] [-X lvl] [-d debug_level] [-b ] [-n ] [-i initial_ray_dir] [-g cell_size] -o brlcad_output_file database.g object(s)
g-shell-rect
converts the specified
objects(s)
from a BRL-CAD model
database.g
to a single NMG solid using raytracing. Rays are fired in a uniform grid.
The direction for the first set of rays is chosen by calculating
the presented area of the bounding box of the
object(s)
and selecting the direction with the largest area. The user may override this
by specifying a desired initial ray direction using the
-i
option (see below).
The initial shell is constructed using only the first and last
intersections with the
object(s).
This will typically result in some rather large faces with normals at right angles
to the ray direction. Unless the
-n
option is specified, these faces are then subdivided (according to the
cell_size)
and additional rays fired from the other two directions are used to refine their
shape.
The resulting NMG solid
will be named
shell
and will be written to the specified
brlcad_output_file.
The following command line options are recognized:
-g cell_sizeSpecify the dimensions (in millimeters) of the grid spacing. The default is 50mm.
-i initial_ray_dirSpecify the initial ray direction. Valid values are X, Y, or Z. The best results are usually obtained by raytracing in the direction that produces the most hits first.
-d debug_levelSet the debugging level. Higher values produce more debugging information.
-nSuppresses the refinement stage (firing rays from the secondary and tertiary axis directions).
-bOutput a BOT rather than an NMG.
-a rpp_argsAdd an RPP for refining.
-R edge_tolSupply edge tolerance.
-p plotfileSupply plotfile for plot edge breaking.
-X lvlSupply NMG debug flags.
-o output.gSpecifies the name of the BRL-CAD geometry file to create.