improved solid sections performance

src/polysections.scad

@@ -14,7 +14,42 @@
 include <__private__/__triangles_radial.scad>;
 include <__private__/__triangles_tape.scad>; 
 
-module polysections(sections, triangles = "RADIAL") {
+module polysections(sections, triangles) {
+    module solid_sections() {
+        leng_sections = len(sections);
+        leng_pts_section = len(sections[0]);
+        
+        side_idxes = [
+                for(j = [0:leng_pts_section:(leng_sections - 2) * leng_pts_section])
+                    for(i = [0:leng_pts_section - 1]) 
+                        [
+                            j + i, 
+                            j + (i + 1) % leng_pts_section, 
+                            j + (i + 1) % leng_pts_section + leng_pts_section , 
+                            j + i + leng_pts_section
+                        ]
+             ];
+
+        first_idxes = [for(i = [0:leng_pts_section - 1]) i];   
+        
+        last_idxes = [
+            for(i = [0:leng_pts_section - 1]) 
+                i + leng_pts_section * (leng_sections - 1)
+        ];    
+        
+        v_pts = [
+            for(section = sections) 
+                for(pt = section) 
+                    pt
+        ];
+        
+       polyhedron(
+           v_pts, 
+           concat([first_idxes], side_idxes, [last_idxes])
+       );    
+    }
+    
+    module triangles_defined_sections() {
         module tri_sections(tri1, tri2) {
             polyhedron(
                 points = concat(tri1, tri2),
@@ -77,3 +112,11 @@ module polysections(sections, triangles = "RADIAL") {
              );
         }
     }
+    
+    //
+    if(triangles == undef) {
+        solid_sections();
+    } else {
+        triangles_defined_sections();
+    }
+}