Add AABB intersection test to brushes

csg/src/brush.rs

@@ -64,6 +64,10 @@ impl Brush {
         self.aabb = Aabb::from_positions(&self.vertices);
     }
 
+    pub fn aabb_intersects_with(&self, other: &Brush) -> bool {
+        self.aabb.intersects(other.get_aabb())
+    }
+
     pub fn get_vertices(&self) -> Vec<Vec3> {
         self.vertices.clone()
     }