thehans / functionalopenscad Goto Github PK

text() is not in the list of implemented functions, and not in the list of not-yet-implemented. I hope it's not forgotten.

It doesn't seem to be impossible to implement, with some custom fonts. Here's an example: https://www.thingiverse.com/thing:16193

I have an actual use case for it: Concatenating text, where each text has a different font size.

The way that sum is written here, it explicitly involves numbers, but in OpenSCAD, + works on other kinds of things. Not explicitly involving 0 can save that for summation.

Consider this example:

function vsum(v,i=0) = len(v)-1 > i ? v[i] + vsum(v, i+1) : v[i];

echo(vsum([1,2,3]));

echo(vsum([[1,2,3],[4,5,6]]));

echo(sum([1,2,3]));

echo(sum([[1,2,3],[4,5,6]]));

This is an inefficient method - order N^2 - but should work and large complex faces aren't going to come up often in this kind of application.

triangulate.scad.txt

I'm not sure what your stylistic sensibilities are, but there's a 'shoelace formula' for volume that seems like it would fight right in here:

function signed_volume(poly)=
   sum([ for(i=[0:len(poly[1])]
      _signed_volume(poly[0],poly[1][i])
   ])
;

function _signed_volume(points,face)=
   let( l=len(face) )
   (l>2)?
      sum([
         for(i=[1:l-2]) 
         cross(points[face[i]]-points[face[0]],points[face[i+1]]-points[face[i]])
   ])*points[face[0]]/6;
   :
      0
;