This command is used to offset a triangulated surface in the direction of the surface outward normal, i.e., normal surface motion. For each node a ‘synthetic’ unit outward normal N is computed based on the weighted average angle of the normals of the triangles shared by that node.
To add the nodes in the new surface to the main mesh object use the
copypts command. To add the new surface to the main mesh object use a surface command with new_cmo
as the sheet name (e.g. surface/s2d/bndy_type)
offsetsurf/ new_cmo / old_cmo / dist / [keywords]
new_cmo is the name of the new surface.
old_cmo is the surface to be used in generating the offset surface.
dist is the distance to offset the surface. The new
node coordinates, R_new, are computed using the formula: R_new = R_old + dist times N_node
The following keywords are available:
keepatt, keep_angle Compute node angle weighted normals and keep the vector components in three scalar attributes x_n_norm y_n_norm z_n_norm
keep_area Compute node area weighted normals and keep the vector components in three scalar attributes x_n_norm y_n_norm z_n_norm
xzero Compute the full offset direction vector but set x component to zero
yzero Compute the full offset direction vector but set y component to zero
zzero Compute the full offset direction vector but set z component to zero
xy, xz, yx, yz, zx, zy - these keywords come after the ‘dist’ value. They constrain the offset to
be parallel to the specified plane. These arguments can be used with a line type mesh object to constrain the offset to a particular plane.
offsetsurf/mo_out/cmo_in/d
offset a triangulated surface a distance d using angle weighted normals
offsetsurf/cmo_out / cmo_in / d / keep_area
offset using area weighted normals
offsetsurf/mo_out/cmo_in/d/[xy,xz,yx,yz,zx,zy]
offset a line cmo a distance d in a direction parallel to the specified plane
offsetsurf/mo_out/cmo_in/d/x y z
offset a line cmo a distance d in the direction specified by the vector (x,y,z)