Merge c83253c814 into 3f9fb3a5b4

rounded prism anchor improvements

beziers.scad

@@ -466,12 +466,15 @@ function bezpath_curve(bezpath, splinesteps=16, N=3, endpoint=true) =
     assert(len(bezpath)%N == 1, str("A degree ",N," bezier path should have a multiple of ",N," points in it, plus 1."))
     let(
         segs = (len(bezpath)-1) / N,
-        step = 1 / splinesteps
+        step = 1 / splinesteps,
-    ) [
+        path = [
             for (seg = [0:1:segs-1])
                 each bezier_points(select(bezpath, seg*N, (seg+1)*N), [0:step:1-step/2]),
             if (endpoint) last(bezpath)
-    ];
+        ],
+        is_closed = approx(path[0], last(path)),
+        out = path_merge_collinear(path, closed=is_closed)
+    ) out;
 
 
 // Function: bezpath_closest_point()

rounding.scad

@@ -2095,9 +2095,9 @@ function _rp_compute_patches(top, bot, rtop, rsides, ktop, ksides, concave) =
 //   top = 2d or 3d path describing top polygon (must be the same dimension as bottom)
 //   ---
 //   height/length/h/l = height of the shape when you give 2d bottom
-//   joint_top = rounding length for top (number or 2-vector).  Default: 0
+//   joint_top = joint distance or [joint,k] pair for top roundover (number or 2-vector).  Default: 0
-//   joint_bot = rounding length for bottom (number or 2-vector).  Default: 0
+//   joint_bot = joint distance or [joint,k] for bottom roundover (number or 2-vector).  Default: 0
-//   joint_sides = rounding length for side edges, a number/2-vector or list of them.  Default: 0
+//   joint_sides = joint distance or [joint,k] for rounding of side edges, a number/2-vector or list of them.  Default: 0
 //   k = continuous curvature rounding parameter for all edges.  Default: 0.5
 //   k_top = continuous curvature rounding parameter for top
 //   k_bot = continuous curvature rounding parameter for bottom