Builds a sphere by generating coordinates of points and also modifies zoning by ratio-zoning point distributions. See the rz command for more details. The ** ** itype flag defines what type of sphere will be generated.
itype=1 generates a sphere by gridding the faces of a cube and then projecting the vertices onto a sphere. The number of nodes per shell is of the form 6 *i * *2.
itype=2 generates a sphere by subdividing an icosahedron placed on the surface of a sphere.
Icosahedral gridding is made up of 10 diamonds per shell. Each diamond is made up of n * *2 nodes (where n must be of the form 2 * *i+1). There are 2 nodes (the poles of the sphere) at which 5 diamonds meet and 10 nodes where 3 diamonds meet; hence there are a minimum of 12 nodes per shell. The number of nodes per shell can be 12, 42, 162, 642,…
itype= 1 or 2 or diamond distributes points only, call connect to generate connectivity information.
nr is the number of radial shells
npt is the upper limit of the number of points in a shell
itype=8 generates a hexahedral icosahedron grid. This option distributes points and generates the grid connectivity data structures.
xirad,xorad are the inner and outer radii of the sphere. For itype=8 reverse inner and outer radii.
xcen,ycen,zcen are the coordinates of the center of the sphere
iz if =0 then mins and maxs are used as cell centers
if =1 then mins and maxs are used as cell vertices
irat is ratio zoning switch (0=off,1=on)
rz is ratio zoning value - distance is multiplied by the value for each subsequent point.
itype = diamond generates the points for one diamond of the icosahedron