RZ
This command adds points to the mesh. It can distribute points evenly or according to a ratio zoning method.
xyz specifies Cartesian coordinates.
rtz specifies cylindrical coordinates.
rtp specifies spherical coordinates.
line this option implies xyz and will distribute n1 nodes from (xmin,ymin,zmin) to (xmax,ymax,zmaz)
When using the rtz or rtp coordinate systems the center is at (0,0,0). Use a trans command to move the center. For the rtz command, minimum and maximum coordinates are the triplets: radius from the cylinder's axis, angle in the xy-plane measured from the x-axis and height along the z-axis. For the rtp command minimum and maximum coordinates are the triplets: radius from the center of the sphere axis, angle in the zy-plane measured from the positive z-axis and the angle in the xy-plane measured from the positive x-axis (see II.a.11). Note that the rtz always results in a (partial) cylinder of points centered around the z axis. Use the rotateln command to orient the cylinder. For example, to center the cylinder around the y axis, specify the x axis as the line of rotation in the rotateln command.

ni,nj,nk number of points to be created in each direction.
xmin,ymin,zmin minimums for coordinates.
xmax,ymax,zmax maximums for coordinates.
iiz,ijz,ikz if =0 then mins and maxs are used as cell centers
if =1 then mins and maxs are used as cell vertices
iirat,ijrat,ikrat ratio zoning switches (0=off,1=on)
xrz,yrz,zrz ratio zoning value - distance is multiplied by this value for each subsequent point.

FORMAT: rz/xyz|rtz|rtp|ni,nj,nk/xmin,ymin,zmin/xmax,ymax,zmax/
iiz,ijz,ikz/[iirat,ijrat,ikrat/xrz,yrz,zrz/]
rz/line/np///xmin,ymin,zmin,xmax,ymax,zmax/iiz,ijz,ikz/

EXAMPLES: rz/xyz/5,3,10/0.,2.,0./5.,6.,2./1,1,1/
This results in a set of 150 points, five across from x=0. to x=5., 3 deep from y=2. to y=6. and 10 high from z=0. to z=2.
rz/rtz/4,6,11/0.,0.,0./3.,360.,10./1,0,1/
This results in 264 points arranged around the z- axis. There are 3 rings of points at distances r=1., r=2. and r=3. from the z-axis. There are 11 sets of these three rings of points and heights z=0., z=1., z=2.,...,z=10. In each ring there are 6 points where each pair of points is separated by 60°; note that ijz=0 requests that points be placed at cell centers, hence the first point will be at 30° not at 0°. Corresponding to r=0, there will be 6 identical points at 11 intervals along the z-axis at heights z=0., z=1., z=2.,...z=10. Filter should be used to remove these duplicate points.