Bug Report - could not export control polygon with SubD display toggle

I could not export a obj file of SubD control polygon with SubD display toggle in Rhino 8.
exported object become meshed sub divided object not control one.
I can do this job in Rhino 7.

another thing
mesh from lines command did not work well in Rhino 8.
Rhino 7 makes better result.

please check those issue
thank you

system info

Rhino 8 SR5 2024-3-12 (Rhino 8, 8.5.24072.13001, Git hash:master @ e3530849b75f00b2b977766a567ae29b055837e9)
License type: 商用版, build 2024-03-12
License details: Cloud Zoo

Windows 11 (10.0.22631 SR0.0) or greater (Physical RAM: 32GB)
.NET 7.0.17

Computer platform: DESKTOP

Standard graphics configuration.
Primary display and OpenGL: NVIDIA Quadro P4000 (NVidia) Memory: 8GB, Driver date: 2-7-2024 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 551.52
> Accelerated graphics device with 4 adapter port(s)
- Windows Main Display attached to adapter port 0

Secondary graphics devices.
Intel(R) UHD Graphics 770 (Intel) Memory: 1GB, Driver date: 1-18-2024 (M-D-Y).
> Integrated graphics device with 0 adapter port(s)
- There are no monitors attached to this device!

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)

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

Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 2-7-2024
Driver Version: 31.0.15.5152
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 8 GB

Rhino plugins that do not ship with Rhino

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp “Commands” 8.5.24072.13001
C:\Program Files\Rhino 8\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 8.5.24072.13001
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 8.5.24072.13001
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp “MeshCommands” 8.5.24072.13001
C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp “RhinoCycles” 8.5.24072.13001
C:\Program Files\Rhino 8\Plug-ins\RhinoCode\RhinoCodePlugin.rhp “RhinoCodePlugin” 8.5.24072.13001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 8.5.24072.13001
C:\Program Files\Rhino 8\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 8\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 8\Plug-ins\SectionTools.rhp “SectionTools”

Hello-
ExtractControlPolylgon > Export to OBJ works correctly here as far as I can see - are you doing something different than that?
Please post an example of MeshFromLines that does not work as well as V7.

-Pascal

Hi

Thank you for your comment. Yes, I know ExtractControlPolygon works.
I have usually used SubD display toggle. just display control polygon of SubD without Extract, and export to obj. that works in Rhino 7.

About MeshFromLines, I uploaded a example.
I could make mesh of these lines all at once in Rhino 7.
MeshFromLines-sample-R8.3dm (189.1 KB)

Hello- to get the control net either way, use this setting:

It is not dependent on the display as far as I can see.

I see that MeshFromLines fails though - thanks for the example.
RH-81477 MeshFromLines fails

-Pascal

Hi
you are right. its not depend on Display toggle.
I did not notice that checks is on in Rhino 7 and off in Rhino 8.
Thanks