use m_transpose

examples/dragon/dragon_head.scad

@@ -1,7 +1,7 @@
 use <ellipse_extrude.scad>;
 use <curve.scad>;
 use <sweep.scad>;
-use <rails2sections.scad>;
+use <matrix/m_transpose.scad>;
 use <shape_trapezium.scad>;
 use <ptf/ptf_rotate.scad>;
 
@@ -52,7 +52,7 @@ module dragon_head() {
 
         translate([0, 0, -2]) 
         rotate([90, 0, -90]) 
-            sweep(rails2sections([path1, path2, path3, path4, path5]));
+            sweep(m_transpose([path1, path2, path3, path4, path5]));
 
         translate([0, 0, -3.25]) 
         rotate([90, 0, -90]) 

examples/hollow_out/hollow_out_vase.scad

@@ -1,7 +1,7 @@
 use <polyline_join.scad>;
 use <bezier_curve.scad>;
 use <ptf/ptf_rotate.scad>;
-use <rails2sections.scad>;
+use <matrix/m_transpose.scad>;
 use <experimental/hollow_out_sweep.scad>;
 use <experimental/tri_bisectors.scad>;
 
@@ -27,7 +27,7 @@ module hollow_out_vase(ctrl_pts, t_step, line_diameter, fn, line_style) {
     fpt = ctrl_pts[len(ctrl_pts) - 1];
 
     a_step = 360 / fn;
-    sects = rails2sections([
+    sects = m_transpose([
         for(a = [0:a_step:360 - a_step])
         [for(p = bezier) ptf_rotate(p, [0, 0, a])]
     ]);

examples/owl.scad

@@ -4,7 +4,7 @@ use <polyhedra/icosahedron.scad>;
 use <shear.scad>;
 use <polyline_join.scad>;
 use <bezier_curve.scad>;
-use <rails2sections.scad>;
+use <matrix/m_transpose.scad>;
 use <sweep.scad>;
 use <experimental/worley_sphere.scad>;
 use <curve.scad>;
@@ -164,7 +164,7 @@ module owl(detail, head_angles) {
 			points4, points3, points2, points
 		];
 
-		sections = rails2sections(rails);
+		sections = m_transpose(rails);
 
 		sweep(sections);
 	}

src/experimental/note.md

@@ -17,4 +17,7 @@ new:
 
 - util/count
 - lemniscate_curve?
-- perlin_sphere?
+- perlin_sphere?
+
+deprecated:
+    rails2sections: use m_transpose