smooth gyroid poly lines

js/geo-gyroid.js

@@ -139,7 +139,37 @@ var gs_base_gyroid = exports;
             } while (added);
         } while (cleared < sparse.length);
 
-        return {edge, points, dir, polys};
+        return {edge, points, dir, polys: polys.map(poly => filter(poly))};
+    }
+
+    function filter(poly) {
+        if (poly.length === 1) {
+            return poly;
+        }
+        let nuchain = [];
+        let e1 = poly[0];
+        let e2 = null;
+        let last = poly.length - 1;
+        for (let i=1; i<poly.length; i++) {
+            let el = poly[i];
+            if (e1.x === el.x || e1.y === el.y) {
+                e2 = el;
+                if (i < last) {
+                    continue;
+                }
+            }
+            if (e2) {
+                nuchain.push({x:(e1.x + e2.x)/2, y:(e1.y + e2.y)/2});
+                e2 = null;
+            } else {
+                nuchain.push(e1);
+                if (i === last) {
+                    nuchain.push(el);
+                }
+            }
+            e1 = el;
+        }
+        return nuchain;
     }
 
     function dist(a, b, dir) {

js/license.js

@@ -1,7 +1,7 @@
 var exports = {
     COPYRIGHT:"Copyright (C) 2014-2019 Stewart Allen <sa@grid.space> - All Rights Reserved",
     LICENSE:"See the license.md file included with the source distribution",
-    VERSION:"1.2.6"
+    VERSION:"1.2.6a"
 };
 if (!module) var module = {};
 module.exports = exports;

web/kiri/gyroid-test.html

@@ -192,9 +192,42 @@
                 } while (added);
             } while (cleared < sparse.length);
 
+            // simplify poly
+            polys = polys.map(poly => filter(poly));
+
             return zcache[zkey] = {edge, points, dir, polys};
         }
 
+        function filter(poly) {
+            if (poly.length === 1) {
+                return poly;
+            }
+            let nuchain = [];
+            let e1 = poly[0];
+            let e2 = null;
+            let last = poly.length - 1;
+            for (let i=1; i<poly.length; i++) {
+                let el = poly[i];
+                if (e1.x === el.x || e1.y === el.y) {
+                    e2 = el;
+                    if (i < last) {
+                        continue;
+                    }
+                }
+                if (e2) {
+                    nuchain.push({x:(e1.x + e2.x)/2, y:(e1.y + e2.y)/2});
+                    e2 = null;
+                } else {
+                    nuchain.push(e1);
+                    if (i === last) {
+                        nuchain.push(el);
+                    }
+                }
+                e1 = el;
+            }
+            return nuchain;
+        }
+
         function dist(a, b, dir) {
             let dx = a.x - b.x;
             let dy = a.y - b.y;