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documentation/lagrit_manual/commands/rzs.txt

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+.. _rzs :
+
+> **_RZS_**
+
+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.
+
+Icosahedralm 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&nbsp_place_holder; if =0 then mins and maxs are used as cell centers
+
+&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&n
+bsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder; 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
+
+&nbsp_place_holder; FORMAT:
+**rzs/**itype/nr,npt,xirad,xorad/xcen,ycen,zcen/iz/irat,rz/
+
+&nbsp_place_holder; EXAMPLES: **rzs**/8/5/162/1.0,0.5/0.,0.,0./1,0,0.0/
+
+rzs/2/5/162/0.5,1.0/0.,0.,0./1,0,0.0/
+
+rzs/diamond/5/162/1,.5/0,0,0/1,0,0/
+