diff --git a/PicoGK_Utils.cs b/PicoGK_Utils.cs
index 0be3ef5..dadef83 100644
--- a/PicoGK_Utils.cs
+++ b/PicoGK_Utils.cs
@@ -326,12 +326,17 @@ static public Mesh mshCreateCylinder( Vector3? vecScale     = null,
 
             if (iSides <= 0)
             {
+                float fVoxA = fA / Library.fVoxelSizeMM;
+                float fVoxB = fB / Library.fVoxelSizeMM;
                 //Ramanujan's ellipse perimeter
                 //P ≈ π [ 3 (a + b) - √[(3a + b) (a + 3b) ]]
                 //P ≈ π(a + b) [ 1 + (3h) / (10 + √(4 - 3h) ) ], where h = (a - b)2/(a + b)2
 
-                float fP    = MathF.PI * (3.0f * (fA + fB) - MathF.Sqrt((3.0f * fA + fB) * (fA + 3.0f * fB)));
-                iSides      = 2 * (int)MathF.Ceiling(fP);
+                float fP    = float.Pi * (3.0f * (fVoxA + fVoxB)
+                                - float.Sqrt((3.0f * fVoxA + fVoxB)
+                                * (fVoxA + 3.0f * fVoxB)));
+
+                iSides      = 2 * (int) float.Ceiling(fP);
             }
 
             if (iSides < 3)
@@ -388,7 +393,13 @@ static public Mesh mshCreateCone(Vector3? vecScale = null,
 
             if (iSides <= 0)
             {
-                float fP = MathF.PI * (3.0f * (fA + fB) - MathF.Sqrt((3.0f * fA + fB) * (fA + 3.0f * fB)));
+                float fVoxA = fA / Library.fVoxelSizeMM;
+                float fVoxB = fB / Library.fVoxelSizeMM;
+
+                float fP =  float.Pi * (3.0f * (fVoxA + fVoxB)
+                            - float.Sqrt((3.0f * fVoxA + fVoxB)
+                            * (fVoxA + 3.0f * fVoxB)));
+
                 iSides = 2 * (int)MathF.Ceiling(fP);
             }
 
@@ -499,7 +510,10 @@ static public Mesh mshCreateGeoSphere(Vector3? vecScale = null,
             
             if (iSubdivisions <= 0)
             {
-                int iTargetTriangles = (int)MathF.Ceiling(fApproxEllipsoidSurfaceArea(vecRadii));
+                int iTargetTriangles = (int) MathF.Ceiling(
+                                    fApproxEllipsoidSurfaceArea(vecRadii)
+                                    / Library.fVoxelSizeMM
+                                    / Library.fVoxelSizeMM);
 
                 iSubdivisions = 1;
                 int iTriangles = 80;