Populating a surface with triangles of limited dimensions

Hi,

I am trying to build a approximation of a surface by using triangles  which have a limited amount of dimensions. For example triangles with sides either 3,5,7,9 or something like that.

The problem with normal approaches is that you would generate points and connect them, but I want a good approximation using only a couple of lengths. Does anyone have a good approach for this problem or a reference project?

my thanks is great

Michiel