diff --git a/csg/src/brush.rs b/csg/src/brush.rs
index ee96325..e68e0f2 100644
--- a/csg/src/brush.rs
+++ b/csg/src/brush.rs
@@ -56,9 +56,21 @@ impl Brush {
             panic!("Invalid number of planes. Minimum 4 planes required.");
         }
 
+        self.calculate_raw_vertices();
+        self.merge_vertices();
+    }
+
+    pub fn get_vertices(&self) -> Vec<Vec3> {
+        self.vertices.clone()
+    }
+
+    pub fn get_intersections(&self) -> Vec<PlaneIntersection> {
+        self.raw_vertices.clone()
+    }
+
+    fn calculate_raw_vertices(&mut self) {
         // Test all permutations of brush planes for intersections
         let mut intersections = vec![];
-        let mut vs: Vec<Vec3> = vec![];
         let len = self.planes.len();
         for i in 0..(len - 2) {
             for j in (i + 1)..(len - 1) {
@@ -75,7 +87,10 @@ impl Brush {
         }
 
         // Validate intersections against other brush planes
+        // Intersections only produce vertices if they're in the half-space of every
+        // plane in the brush.
         // TODO: No need to check against planes that are part of the intersection
+        let mut raw_vertices = vec![];
         for intersection in &intersections {
             let mut valid = true;
             for bplane in &self.planes {
@@ -85,31 +100,30 @@ impl Brush {
                 }
             }
 
-            // Merge vertices
             if valid {
-                let point = intersection.get_intersection_point();
-                let mut duplicate = false;
-                for v in &vs {
-                    if v.abs_diff_eq(point, math::EPSILON) {
-                        duplicate = true;
-                        break;
-                    }
-                }
-                if !duplicate {
-                    vs.push(point);
+                raw_vertices.push(*intersection);
+            }
+        }
+
+        self.raw_vertices = raw_vertices;
+    }
+
+    fn merge_vertices(&mut self) {
+        let mut vs: Vec<Vec3> = vec![];
+        for intersection in &self.raw_vertices {
+            let point = intersection.get_intersection_point();
+            let mut duplicate = false;
+            for v in &vs {
+                if v.abs_diff_eq(point, math::EPSILON) {
+                    duplicate = true;
+                    break;
                 }
             }
+            if !duplicate {
+                vs.push(point);
+            }
         }
 
         self.vertices = vs;
-        self.raw_vertices = intersections;
-    }
-
-    pub fn get_vertices(&self) -> Vec<Vec3> {
-        self.vertices.clone()
-    }
-
-    pub fn get_intersections(&self) -> Vec<PlaneIntersection> {
-        self.raw_vertices.clone()
     }
 }