There are also a lot of parameters that are not shared by all tools, but have a similar meaning whenever used. When generating new tools the meaning of those parameters should not be overlayed.
The parameter -n always specifies an integer number controling the number of output points. Whenever there are comparisons of points in a tool there is the flag -eps as a tolerance, so that two points are seen as qual if all coordinates lie within an epsilon neighborhood of the other point. Different epsilon values can be specified for each coordinate using either -epsx, -epsy, -epsz or by specifying the coordinate number by using -eps0, -eps1 and so on. (The second method allows the user to handle sets with more than 3 dimensions.) The choice of the epsilon is often very important for the result due to the inaccuracy of number representation inside the computer.