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.
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
None
Third party kernel extensions
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Third party plugins
/usr/lib/log/liblog_network.dylib