Possible Bug: Loft

Problem Loft 3.3dm (3.5 MB)

Here is something that I created that has odd behavior. I wanted to create a closed polysrf from these shapes. My normal procedure would be to do a Loft with straight sections then cap.

If I do that with these shapes, it will not cap.

If loft then use planarsrf the edges then join, I get a bad polysrf. I can extract the bad surface then cap and all is well.

I can also do two lofts, join, then cap, mergesrf and that works.

There are no objects in your attached file.

They are on an off layer… But they loft and cap just fine here.


That’s funny, they consistently do not cap on my machine. However, I note that in the file where I was actually using these, I created the same same curves at different rotations and all the others do cap.

Rhino 6 SR24 2020-3-19 (Public Build, 6.24.20079.23332, Git hash:master @ 064283610b834170e52117f2656605b5b25d65c0)
License type: Commercial, build 2020-03-19
License details: Cloud Zoo. In use by: John Miano ()

Apple Intel 64-bit macOS Version 10.14.6 (Build 18G4032) (Physical RAM: 32Gb)
Mac Model Identifier: MacBookPro15,1
Machine name: Chloe (2)
Language: en-US (MacOS default)

AMD Radeon Pro 560X OpenGL Engine (OpenGL ver:4.1 ATI-2.11.21)

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

Anti-alias mode: 8x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: Height

Vendor Name: ATI Technologies Inc.
Render version: 4.1
Shading Language: 4.10
Maximum Texture size: 16384 x 16384
Z-Buffer depth: n/a
Maximum Viewport size: 16384 x 16384
Total Video Memory: 4 GB
Graphics: Radeon Pro 560X
Displays: Color LCD (258dpi 2x)

Graphics processors
Intel UHD Graphics 630 (1536 MB)
Radeon Pro 560X (4 GB)
Color LCD (1680 x 1050)

USB devices
Apple Inc.: Touch Bar Backlight
Apple Inc.: Touch Bar Display
Apple Inc.: Apple Internal Keyboard / Trackpad
Apple: Headset
Apple Inc.: Ambient Light Sensor
Apple Inc.: FaceTime HD Camera (Built-in)
Apple Inc.: Apple T2 Controller

Bluetooth devices

Third party kernel extensions

Third party plugins

Rhino plugins
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RhinoCycles.rhp “RhinoCycles” 6.24.20079.23332
/Applications/Rhinoceros.app/Contents/PlugIns/NamedSnapshots.rhp “Snapshots” 6.24.20079.1002
/Applications/Rhinoceros.app/Contents/PlugIns/RhinoBonusTools.rhp “Rhino Bonus Tools” 6.24.20079.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/GrasshopperPlugin.rhp “Grasshopper” 6.24.20079.23332
/Applications/Rhinoceros.app/Contents/PlugIns/PanelingTools.rhp “PanelingTools” 6.24.20079.1002
/Applications/Rhinoceros.app/Contents/PlugIns/AnimationTools.rhp “AnimationTools” 6.24.20079.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/Commands.rhp “Commands” 6.24.20079.23332
/Applications/Rhinoceros.app/Contents/PlugIns/SolidTools.rhp “SolidTools” 6.24.20079.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhMaterialEditor.framework “Renderer Development Kit” 6.24.20079.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RDK_EtoUI.rhp “RDK_EtoUI” 6.24.20079.23332
/Applications/Rhinoceros.app/Contents/PlugIns/Displacement.rhp “Displacement” 6.24.20079.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/BlockEdit.rhp “BlockEdit” 6.24.20079.23332
/Applications/Rhinoceros.app/Contents/PlugIns/RhinoLabsTools.rhp “Rhino Labs Tools” 6.24.20079.1002
/Applications/Rhinoceros.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RhinoDLR_Python.rhp “IronPython” 6.24.20079.23332
/Applications/Rhinoceros.app/Contents/PlugIns/RhinoRender.rhp “Rhino Render” 6.24.20079.1002