Experimental functionality

Signed-off-by: Tony Tkacik <tonydamage@gmail.com>

unwrap.scad

@@ -0,0 +1,53 @@
+use <./vector.scad>
+
+function _unwrap_x_half(original,unwrapped=[],offset=0)=
+    let(length=len(original))
+    let(half=(length-2)/2+1)
+    let(i=len(unwrapped))
+    let(prev=original[i-1])
+    let(cur=original[i])
+    let(dx=cur[0]-prev[0])
+    let(dz=cur[2]-prev[2])
+    let(new=[offset+sqrt(pow(dx,2)+pow(dz,2)),cur[1],0])
+
+    i < half ? _unwrap_x_half(original,concat(unwrapped,[new]),new[0]) : concat(unwrapped,[new]) ;
+
+;
+
+function _unwrap_x(p)=
+    let(length=len(p))
+    let(half=(length-2)/2+1)
+    let(first=_unwrap_x_half(p,[[p[0][0],p[0][1],0]],p[0][0]))
+    let(second=[
+        for( i = [len(first):length-1])
+           [p[length-i][0],p[i][1],0]
+    ])
+    flatten_vec([first,second])
+;
+
+
+function _unwrap_y_half(original,unwrapped,offset,s)=
+    let(length=len(original))
+    let(half=(length-2)/2+1)
+    let(i=len(unwrapped))
+    let(prev=original[i-1])
+    let(cur=original[i])
+    let(dx=cur[0]-prev[0])
+    let(dy=cur[1]-prev[1])
+    let(dz=cur[2]-prev[2])
+    let(new=[cur[0],offset+s*sqrt(pow(dy,2)+pow(dz,2)),0])
+
+    i < half ? _unwrap_y_half(original,concat(unwrapped,[new]),new[1],s) : concat(unwrapped,[new]) ;
+
+;
+
+function _unwrap_y(p,s=1)=
+    let(length=len(p))
+    let(half=(length-2)/2+1)
+    let(first=_unwrap_y_half(p,[[p[0][0],p[0][1],0]],p[0][1],s))
+    let(second=[
+        for( i = [len(first):length-1])
+           [p[i][0],first[length-i][1],0]
+    ])
+    flatten_vec([first,second])
+;

wireframe.scad

@@ -0,0 +1,48 @@
+module _rod(a, b, r) {
+        translate(a) sphere(r=r);
+        translate(b) sphere(r=r);
+
+        dir = b-a;
+        h   = norm(dir);
+        if(dir[0] == 0 && dir[1] == 0) {
+            // no transformation necessary
+            cylinder(r=r, h=h);
+        }
+        else {
+            w  = dir / h;
+            u0 = cross(w, [0,0,1]);
+            u  = u0 / norm(u0);
+            v0 = cross(w, u);
+            v  = v0 / norm(v0);
+            multmatrix(m=[[u[0], v[0], w[0], a[0]],
+                          [u[1], v[1], w[1], a[1]],
+                          [u[2], v[2], w[2], a[2]],
+                          [0,    0,    0,    1]])
+            cylinder(r=r, h=h);
+        }
+    }
+
+module outline(points3,r=0.5) {
+        p=len(points3);
+        for(start = [0:1:p-1]) {
+           stop=(start+1)%p;
+           a = points3[start];
+           b = points3[stop];
+           // FIXME: Do not repeat points
+           echo(a,b);
+           _rod(a,b,r);
+        }
+}
+
+module wireframe(points3,polygons,r=0.5) {
+    for(p=polygons) {
+        for(set = [0:1:len(p)-1]) {
+           a = points3[p[set]];
+           b = points3[p[(set+1)%len(p)]];
+           // FIXME: Do not repeat points
+           echo(p[set],p[(set+1)%len(p)],a,b);
+           _rod(a,b,r);
+        }
+
+    }
+}