surf_extrude: linear extrusion of 3d surfaces in OpenSCAD

thingiverse

surf_extrude allows for linearly extruding a surface given in the form: f(x,y)=z and defined over a matrix of x,y points. It conveniently builds up the mesh and the polyhedron, without any effort from the user. The extrusion length and direction is controlled by a vector, the default [0,0,1] results in a 1 mm extrusion in the z direction. I am sure that there are other several implementations out there, but I couldn't find anything being simple and quick to my taste, so I went for it. Example usage: surf = [for (x=linspace(0,40,100)) [for (y=linspace(0,20,100)) [ x, y, sqrt(x)+sqrt(y)+2*cos(x*40+200*cos(y*20)) ] ]]; surf_extrude(surf, direction=[0,0,1]);