diff --git a/src/bounce/collision/shapes/qhull.cpp b/src/bounce/collision/shapes/qhull.cpp
index 4508df1..dad1074 100644
--- a/src/bounce/collision/shapes/qhull.cpp
+++ b/src/bounce/collision/shapes/qhull.cpp
@@ -424,7 +424,7 @@ void b3QHull::SetAsCylinder(float32 radius, float32 height)
 	b3Quat q = b3QuatRotationY(kAngleInc);
 
 	{
-		b3Vec3 center(0.0f, 0.0f, 0.0f);
+		b3Vec3 center(0.0f, -0.5f * height, 0.0f);
 		b3Vec3 n1(1.0f, 0.0f, 0.0f);
 		b3Vec3 v1 = center + radius * n1;
 		for (u32 i = 0; i < kEdgeCount; ++i)
@@ -441,7 +441,7 @@ void b3QHull::SetAsCylinder(float32 radius, float32 height)
 	}
 
 	{
-		b3Vec3 center(0.0f, height, 0.0f);
+		b3Vec3 center(0.0f, 0.5f * height, 0.0f);
 		b3Vec3 n1(1.0f, 0.0f, 0.0f);
 		b3Vec3 v1 = center + radius * n1;
 		for (u32 i = 0; i < kEdgeCount; ++i)
@@ -475,7 +475,7 @@ void b3QHull::SetAsCone(float32 radius, float32 height)
 	float32 kAngleInc = 2.0f * B3_PI / float32(kEdgeCount);
 	b3Quat q = b3QuatRotationY(kAngleInc);
 
-	b3Vec3 center(0.0f, 0.0f, 0.0f);
+	b3Vec3 center(0.0f, -0.5f * height, 0.0f);
 	b3Vec3 n1(1.0f, 0.0f, 0.0f);
 	b3Vec3 v1 = center + radius * n1;
 	for (u32 i = 0; i < kEdgeCount; ++i)
@@ -490,7 +490,7 @@ void b3QHull::SetAsCone(float32 radius, float32 height)
 		v1 = v2;
 	}
 
-	vs[count++].Set(0.0f, height, 0.0f);
+	vs[count++].Set(0.0f, 0.5f * height, 0.0f);
 
 	// Set
 	Set(vs, count, false);