feat: size

src/core/blitzkrieg/modelDefinitions.ts

@@ -8,7 +8,7 @@ export interface ModelArmor {
   spaced?: number[];
 }
 
-interface BoundingBox {
+export interface BoundingBox {
   min: Vector3Tuple;
   max: Vector3Tuple;
 }

src/core/blitzkrieg/normalizeBoundingBox.ts

@@ -0,0 +1,8 @@
+import { Vector3Tuple } from 'three';
+import { BoundingBox } from './modelDefinitions';
+
+export function normalizeBoundingBox(boundingBox: BoundingBox) {
+  return boundingBox.max.map(
+    (max, index) => max - boundingBox.min[index],
+  ) as Vector3Tuple;
+}

src/core/blitzkrieg/unionBoundingBox.ts

@@ -0,0 +1,9 @@
+import { Vector3Tuple } from 'three';
+import { BoundingBox } from './modelDefinitions';
+
+export function unionBoundingBox(a: BoundingBox, b: BoundingBox) {
+  return {
+    min: a.min.map((a, index) => Math.min(a, b.min[index])) as Vector3Tuple,
+    max: a.max.map((a, index) => Math.max(a, b.max[index])) as Vector3Tuple,
+  } satisfies BoundingBox;
+}