Jagged surface and Render mesh problem


I have recently upgraded to a new computer (Intel Core i7-8700K CPU, Quadro P2000 GPU, 32GB DDR4 RAM) Ought to be enough for anybody…Right?.. I have also upgraded to Rhino 6 and RhinoCAM 2019. I have 9 years of experience with Rhino4 then Rhino5 as well as multiple versions of RhinoCAM along the way.

I have encountered the issue in the past where curved surfaces are displayed as facets between surface isocurves. I then noticed that RhinoCAM was creating toolpaths that followed the facets. It was always an easy fix in Rhino5, Rhino Options>Mesh>Smooth and slower. If that wasn’t enough for complex surfaces, >Custom>Density: 1.0. Problem solved, RhinoCAM would create nice smooth toolpaths.

This is my issue, creating new parts in Rhino6 I can immediately see that curved surfaces show up as jagged facets. When I try to adjust Render mesh quality, it either does not improve, it improves(but still not even close to aceptable) or in most cases gets worse when I try to adjust >Density: and >Detailed controls.

Please see the screen shots attached as an example of a basic cylinder with multiple settings but no change.Uploading: mesh problem image003.png… Uploading: mesh problem image004.jpg…

I am at a loss as to what is going on…? what is wrong with my mesh…?

mesh problem Cylinder.3dm (58.9 KB)

Hi Jonathan - your screenshots were not attached correctly, could you please try again - and also upload the 3dm file.

Also, please run the Rhino SystemInfo command and post the result here.

Hello - in the ‘detailed controls’ for meshing, please try setting ‘Maximum distance edge to surface’ to .01. Any better?
(RefreshShade after the change, btw, and also make sure ‘Jagged seams’ is not checked)


Rhino 6 SR15 2019-6-13 (Rhino 6, 6.15.19164.21011, Git hash:master @ e41c99d36bb5000377057645e96b3ea6facf6171)
License type: Commercial, build 2019-06-13
License details: Stand-Alone

Windows 10.0 SR0.0 or greater (Physical RAM: 32Gb)
Machine name: RND0419

Non-hybrid graphics.
Primary display and OpenGL: NVIDIA Quadro P2000 (NVidia) Memory: 5GB, Driver date: 2-20-2019 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 419.17

Secondary graphics devices.
Intel® UHD Graphics 630 (Intel) Memory: 1GB, Driver date: 3-8-2019 (M-D-Y).

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On

Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: Height

Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 2-20-2019
Driver Version:
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 5 GB

Rhino plugins
C:\Program Files\Rhino 6\Plug-ins\Commands.rhp “Commands” 6.15.19164.21011
C:\Program Files\Rhino 6\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 6\Plug-ins\RhinoCAM 2019 for R6\RhinoCAM 2019 For Rhino6.0.rhp “RhinoCAM 2019 - The cutting edge CAM plug-in for Rhino 6.0 from MecSoft Corporation”
C:\Program Files\Rhino 6\Plug-ins\RhinoRender.rhp “Rhino Render”
C:\Program Files\Rhino 6\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 6.15.19164.21011
C:\Program Files\Rhino 6\Plug-ins\rdk_ui.rhp “Renderer Development Kit UI”
C:\Program Files\Rhino 6\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 6\Plug-ins\RhinoCAM 2019 for R6\RhinoArt1FileExporter For Rhino6.0.rhp “RhinoArt1FileExporter”
C:\Program Files\Rhino 6\Plug-ins\RhinoCycles.rhp “RhinoCycles” 6.15.19164.21011
C:\Program Files\Rhino 6\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 6.15.19164.21011
C:\Program Files\Rhino 6\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 6\Plug-ins\Displacement.rhp “Displacement”


Yes, It did improve but still not perfect and not as good as what I would expect on my old computer with Rhino5. This was just a simple cylinder as a basic example, I will post an actual file which prompted me to seek help.

Here is the example of the worst I have seen.

Cast deck hatch Plug.3dm (565.0 KB)

Hi Jonathan - start the command DivideAlongCreases > SplitAttangents=Yes and then select your object and Enter. Any better?


1 Like


Thank you, very much appreciated. The issue has been resolved. Here is the result for those in the future reading this thread. RhinoCAM 2019 is also producing nice smooth toolpaths now.