gyroid performance improvement equal to roughly square of volume

src/geo/gyroid.js

@@ -22,7 +22,6 @@ function slice(off, res, val) {
     // or the requested resolution or tip values have changed
     let now = Date.now();
     if (res !== lastRes || val !== lastVal || now - lastSlice > 20000) {
-        // console.log({clear_cache: now});
         cache = {};
     }
     lastVal = val;

src/kiri-mode/fdm/fill.js

@@ -123,9 +123,29 @@ function fillGyroid(target) {
     //         }
     //     }
     // });
-
     let polys = [];
+    if (gyroid.dir == 'lr') {
+        for (let ty=0; ty<=tile_y; ty++) {
+            let temp = [];
             for (let tx=0; tx<=tile_x; tx++) {
+                for (let poly of gyroid.polys) {
+                    target.newline();
+                    let points = poly.map(el => {
+                        return {
+                            x: el.x * tile + tx * tile + bounds.min.x,
+                            y: el.y * tile + ty * tile + bounds.min.y,
+                            z: 0
+                        }
+                    });
+                    temp.push(base.newPolygon().setOpen(true).addObj(points));
+                }
+            }
+            polys.appendAll(connectOpenPolys(temp));
+            // console.log(gyroid.dir, temp.length);
+        }
+    } else {
+        for (let tx=0; tx<=tile_x; tx++) {
+            let temp = [];
             for (let ty=0; ty<=tile_y; ty++) {
                 for (let poly of gyroid.polys) {
                     target.newline();
@@ -136,9 +156,11 @@ function fillGyroid(target) {
                             z: 0
                         }
                     });
-                polys.push(base.newPolygon().setOpen(true).addObj(points));
+                    temp.push(base.newPolygon().setOpen(true).addObj(points));
                 }
             }
+            polys.appendAll(connectOpenPolys(temp));
+        }
     }
     polys = connectOpenPolys(polys);
     for (let poly of polys.filter(p => p.perimeter() > 2)) {
@@ -180,7 +202,8 @@ function connectOpenPolys(noff, dist = 0.1) {
                     continue outer;
                 }
                 if (s1.last().distTo2D(s2.last()) <= dist) {
-                    s1.addPoints(s2.points.reverse());
+                    s2.reverse();
+                    s1.addPoints(s2.points);
                     ntmp[j] = null;
                     continue outer;
                 }