updates

src/solver/VoxelSpace.ts

@@ -37,7 +37,7 @@ export default class VoxelSpace {
         return this.space.toString(2);
     }
 
-    private cullEmptySpace() {
+    getExtrema() {
         const extrema = {
             xMax: -Infinity,
             xMin: Infinity,
@@ -46,7 +46,6 @@ export default class VoxelSpace {
             zMax: -Infinity,
             zMin: Infinity,
         };
-        let newSpace = 0n;
         this.forEachCell((val, x, y, z) => {
             if (val) {
                 extrema.xMax = Math.max(extrema.xMax, x);
@@ -57,7 +56,13 @@ export default class VoxelSpace {
                 extrema.zMin = Math.min(extrema.zMin, z);
             }
         });
+        return extrema;
+    }
+
+    private cullEmptySpace() {
+        const extrema = this.getExtrema();
         let index = 0n;
+        let newSpace = 0n;
         for (let x = extrema.xMin; x <= extrema.xMax; x++) {
             for (let y = extrema.yMin; y <= extrema.yMax; y++) {
                 for (let z = extrema.zMin; z <= extrema.zMax; z++) {