diff --git a/csg/src/brush.rs b/csg/src/brush.rs
index cb54be5..4feab17 100644
--- a/csg/src/brush.rs
+++ b/csg/src/brush.rs
@@ -89,6 +89,46 @@ impl Brush {
         false
     }
 
+    pub fn planes_intersect_with_mat(&self, other: &Brush) -> bool {
+        // Check our vertices against their planes
+        for i in &self.raw_vertices {
+            let mut iter = other.planes.iter();
+            if iter.all(|bp| i.in_halfspace_mat(&bp.plane)) {
+                return true;
+            }
+        }
+
+        // Check their vertices against our planes
+        for i in &other.raw_vertices {
+            let mut iter = self.planes.iter();
+            if iter.all(|bp| i.in_halfspace_mat(&bp.plane)) {
+                return true;
+            }
+        }
+
+        false
+    }
+
+    pub fn planes_intersect_with_gauss(&self, other: &Brush) -> bool {
+        // Check our vertices against their planes
+        for i in &self.raw_vertices {
+            let mut iter = other.planes.iter();
+            if iter.all(|bp| i.in_halfspace_gauss(&bp.plane)) {
+                return true;
+            }
+        }
+
+        // Check their vertices against our planes
+        for i in &other.raw_vertices {
+            let mut iter = self.planes.iter();
+            if iter.all(|bp| i.in_halfspace_gauss(&bp.plane)) {
+                return true;
+            }
+        }
+
+        false
+    }
+
     pub fn get_vertices(&self) -> Vec<Vec3> {
         self.vertices.clone()
     }