fix gyroid. attempted to fix gh build workflow

.github/workflows/build.yml

@@ -22,8 +22,8 @@ jobs:
         with:
           node-version: '20'
 
-      - name: Install dependencies
-        run: npm install
+      - name: Setup Build Environment
+        run: npm run setup
 
       - name: Build Electron app
         env:

src/geo/gyroid.js

@@ -200,10 +200,8 @@ export function filter(poly, inc) {
 export function distTo(a, b, dir) {
     let dx = a.x - b.x;
     let dy = a.y - b.y;
-    if (dir === 'lr') {
-        return Math.abs(dx);
-    } else if (dir === 'td') {
-        return Math.abs(dy);
-    }
+    // bias distance by prevailing direction of discovery to join stragglers
+    if (dir === 'lr') dx = dx / 2;
+    if (dir === 'td') dy = dy / 2;
     return Math.sqrt(dx * dx + dy * dy);
 }

src/kiri-mode/fdm/fill.js

@@ -1,6 +1,7 @@
 /** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
 
 import { base, util } from '../../geo/base.js';
+import { newPolygon } from '../../geo/polygon.js';
 import { slice as gyroid_slice } from '../../geo/gyroid.js';
 
 export const fill_fixed = {
@@ -119,7 +120,7 @@ function fillGyroid(target) {
                             z: 0
                         }
                     });
-                    polys.push(base.newPolygon().setOpen(true).addObj(points));
+                    polys.push(newPolygon().setOpen(true).addObj(points));
                 }
             }
             polys = connectOpenPolys(polys);
@@ -136,7 +137,7 @@ function fillGyroid(target) {
                             z: 0
                         }
                     });
-                    polys.push(base.newPolygon().setOpen(true).addObj(points));
+                    polys.push(newPolygon().setOpen(true).addObj(points));
                 }
             }
             polys = connectOpenPolys(polys);