diff --git a/src/math/convexhull/Face.js b/src/math/convexhull/Face.js
index 51590e3df8c47632a28b5c69a32766926b7d4adc..1564ef43bcc4e5f3ad77aa2b1b9321cdb4ff54b4 100644
--- a/src/math/convexhull/Face.js
+++ b/src/math/convexhull/Face.js
@@ -220,28 +220,7 @@ Object.assign( Face.prototype, {
 
    return discardedFaces;
 
-  },
-
-  clone: function () {
-
-    return new this.constructor().copy( this );
-
-  },
-
-	copy: function ( other ) {
-
-		this.normal.copy( other.normal );
-		this.midpoint.copy( other.midpoint );
-    this.area = other.area;
-
-    this.constant = other.constant;
-    this.outside = other.outside;
-    this.mark = other.mark;
-    this.edge = other.edge;
-
-		return this;
-
-	}
+  }
 
 } );
 
diff --git a/src/math/convexhull/HalfEdge.js b/src/math/convexhull/HalfEdge.js
index 833ce7d1cf166e19b8b4b6482f5b142e755a4c6d..5e8c57c0af5fe472d8b33136e2b50a075f1a360e 100644
--- a/src/math/convexhull/HalfEdge.js
+++ b/src/math/convexhull/HalfEdge.js
@@ -66,25 +66,7 @@ Object.assign( HalfEdge.prototype, {
 
     return this;
 
-  },
-
-  clone: function () {
-
-    return new this.constructor().copy( this );
-
-  },
-
-	copy: function ( other ) {
-
-		this.vertex.copy( other.vertex );
-		this.face.copy( other.face );
-		this.next.copy( other.next );
-		this.prev.copy( other.prev );
-		this.twin.copy( other.twin );
-
-		return this;
-
-	}
+  }
 
 } );
 
diff --git a/src/math/convexhull/VertexList.js b/src/math/convexhull/VertexList.js
index a763cc8821a7a4fec194e1a4fdf89964f9012d5d..0f6bbb6819845b1d2b79ccb73ed60d77c55c3396 100644
--- a/src/math/convexhull/VertexList.js
+++ b/src/math/convexhull/VertexList.js
@@ -191,22 +191,7 @@ Object.assign( VertexList.prototype, {
 
     return this.head === null;
 
-  },
-
-  clone: function () {
-
-    return new this.constructor().copy( this );
-
-  },
-
-	copy: function ( other ) {
-
-    this.head.copy( other.head );
-    this.tail.copy( other.tail );
-
-		return this;
-
-	}
+  }
 
 } );