hey @pascal
this has happened to me a few times lately… here’s a file that shows the behavior (using a shaded viewport)
loftttable.3dm (3.8 MB)
this is what happens on my computer:
(and happens with this file even if i quit rhino then relaunch / re-open the file)
it’s only happening in the WIP for me and not showing up using the latest official version 5.3.2 (5D197)
Software information
Software versions
Rhinoceros version: 5.4 WIP (5E78w)
Rhinoceros path: /Applications/RhinoWIP.app
IronPython version: 5.1.2015.131
WIP expiration: June 16, 2017
Language: en-US (MacOS default)
macOS version: Version 10.12.4 (Build 16E195)
Plug-ins
None
Third party kernel extensions
com.intel.driver.EnergyDriver (2.0) 6EC99BBD-0CA2-3CA6-B252-DE46782936C3
Hardware information
Computer hardware
Hardware model: iMac14,2
Processor: Intel Core i7-4771 CPU @ 3.50GHz
Memory: 24 GB
Architecture: Intel 64 bit
Video hardware
Graphics: NVIDIA GeForce GTX 780M 4096 MB
Memory: 4096 MB
Screen size: 2560 x 1440, 1920 x 1200
Displays: iMac (109dpi 1x), SyncMaster (94dpi 1x)
USB devices
Apple Inc.: Bluetooth USB Host Controller
Apple Inc.: FaceTime HD Camera (Built-in)
Logitech: USB Receiver
C-Media Electronics Inc.: USB Audio Device
Apple Inc.: Apple Keyboard
Bluetooth devices
None
OpenGL information
OpenGL software
OpenGL version: 2.1 NVIDIA-10.16.34 355.10.05.35f05
Render version: 2.1
Shading language: 1.20
Maximum texture size: 16384 x 16384
Z-buffer depth: 24 bits
Maximum viewport size: 16384 x 16384
Implementation settings
Use texture compression: No
Appearance settings
Antialiasing: 8x
Mip map filtering: None
Anisotropic filtering: None