DevLoft & UnrollSrf Issue

Hi team,

I was doing a live demonstration of developable surface creation/unroll with a client and got an unexpected result. Slightly embarrassing as I was explain how easy and robust Rhino was. The client is a Solidworks user.

Very simple parent curves used for devloft. Was using v7 (details below) and after the meeting have done some checks, including using v6 version. Same process and curves in v6 gave the typical results expected.

v6 & v7 files uploaded to Rhino - Upload to Support

I saw the following post, which looks similar issue, but not the same workflow. Potentially the issue is fixed in 7.11 service release, as mentioned by Bill Cook in the replies, but is not published at time of writing.

Rhino 7 SR10 2021-9-13 (Rhino 7, 7.10.21256.17001, Git hash:master @ 68677dc86520a0de9485d8b8fa2e841e757733f3)
License type: Commercial, build 2021-09-13
License details: Cloud Zoo

Windows 10.0.19042 SR0.0 or greater (Physical RAM: 32Gb)

Computer platform: DESKTOP

Standard graphics configuration.
Primary display and OpenGL: NVIDIA Quadro RTX 4000 (NVidia) Memory: 8GB, Driver date: 4-8-2021 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 462.31
> Accelerated graphics device with 4 adapter port(s)
- Windows Main Display attached to adapter port #0
- Secondary monitor attached to adapter port #1
- Secondary monitor attached to adapter port #2

Secondary graphics devices.
Intel(R) UHD Graphics P630 (Intel) Memory: 1GB, Driver date: 6-1-2021 (M-D-Y).
> Integrated graphics device with 3 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: 8x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High

Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 4-8-2021
Driver Version: 27.21.14.6231
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
C:\Program Files\Rhino 6\Plug-ins\Penguin 2.0\Penguin.rhp “Penguin 2.0”
C:\Program Files\SimLab\Plugins\SimLab 3D PDF From Rhino 6\plugins\SimLabPDFExporter.rhp “SimLab PDF Exporter”

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 7\Plug-ins\Commands.rhp “Commands” 7.10.21256.17001
C:\Program Files\Rhino 7\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 7\Plug-ins\RPC.rhp “RPC”
C:\Program Files\Rhino 7\Plug-ins\AnimationTools.rhp “AnimationTools”
C:\Program Files\Rhino 7\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 7.10.21256.17001
C:\Program Files\Rhino 7\Plug-ins\RhinoRender.rhp “Legacy Rhino Render”
C:\Program Files\Rhino 7\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 7.10.21256.17001
C:\Program Files\Rhino 7\Plug-ins\rdk_ui.rhp “Renderer Development Kit UI”
C:\Program Files\Rhino 7\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 7\Plug-ins\RhinoCycles.rhp “RhinoCycles” 7.10.21256.17001
C:\Program Files\Rhino 7\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 7.10.21256.17001
C:\Program Files\Rhino 7\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 7\Plug-ins\Displacement.rhp “Displacement”

Hello - the result here in our latest is clean in the area you’ve marked in your file.

-Pascal

Thanks Pascal. Tried latest service release candidate (7.11.21278.7001, 2021-10-05) and is working fine now.

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