neeman@s5.csrd.uiuc.edu (Henry J. Neeman) (07/03/90)
I'm developing a technique for making pictures out of grids of irregular shape and connectivity, and I need example grids of this type to use for testing my programs. Can anyone help me out? What I'd like is grids which are not regularly shaped. For example, if you're doing a simulation of airflow over an airplane and you have an airplane-shaped grid -- i.e., one which conforms to the shape of the airplane -- that's the kind of thing I need. What I don't want is nice, clean, rectangular grids, or beautiful spherical grids, or what have you; the uglier, the better. Some specifics: I want either deformed cubes (take a cube made up of many smaller rectangular cells and stretch and squash and mush it around, so that the geometry is changed but the connectivity between cells remains the same) or minimal cells that are explicitly defined (e.g., a bunch of triangles in 2D, tetrahedra in 3D, pentatopes in 4D, sexatopes in 5D, etc., with specification of (a) all vertices and (b) which vertices comprise each cell). If you have grids that are irregular but different from these kinds, I'd like to hear about those too, but it might mean extra programming work for me. At this point, time and memory constraints limit me to about 100,000 cells, but in general, I like both big and small grids. I'll take grids of any dimension; in fact, I'm very interested in grids of 4D, 5D, and on up, but I'm guessing that they'll be hard to find. Anyway, if you have grids of this kind, please drop me a line. Thanks in advance, Henry Neeman neeman@csrd.uiuc.edu