To represent a 3D geometry in our software we use this format below: Material-1 Material-2 P1(X1,Y1,Z1) P2(X2,Y2,Z2) P3(X3,Y3,Z3)
This 11 point gives us a triangle with the description of what is behind and front of the triangle. Depicted below:
By applying the right-hand rule (P1 to P2 and then P3, like for electromagnetic force), we know what is Material-1 and Material-2 these are the properties on both sides of the triangular plane.
Using these triangles we can construct the complete surface of our geometries. Since it is hard to create complex 3D surfaces and volumes (enclosed space by these triangles) manually, we want to use CAD software like Blender, SolidWorks, etc. What is the easiest data format (e.g. .STP, .STL, ...) that we can use to convert and represent the 3D geometries with our 5 parameters (actually 11 parameters) geometry format.