diff --git a/csg/src/brush.rs b/csg/src/brush.rs
index 1af0949..b8568b7 100644
--- a/csg/src/brush.rs
+++ b/csg/src/brush.rs
@@ -41,6 +41,8 @@ impl Brush {
             return vec![];
         }
 
+        // Test all permutations of brush planes for intersections
+        let mut intersections = vec![];
         let mut vs = vec![];
         let len = self.planes.len();
         for i in 0..(len - 2) {
@@ -51,13 +53,28 @@ impl Brush {
                         self.planes[j].plane,
                         self.planes[k].plane,
                     ) {
-                        // TODO: Validate that the found intersection is within all brush planes
-                        vs.push(intersection.get_intersection_point())
+                        intersections.push(intersection)
                     }
                 }
             }
         }
 
+        // Validate intersections against other brush planes
+        // TODO: No need to check against planes that are part of the intersection
+        for intersection in intersections {
+            let mut valid = true;
+            for bplane in &self.planes {
+                if !intersection.in_halfspace_mat(&bplane.plane) {
+                    valid = false;
+                    break;
+                }
+            }
+
+            if valid {
+                vs.push(intersection.get_intersection_point());
+            }
+        }
+
         vs
     }
 }