Surface Color does not survive Save

I am having trouble getting colors to save in my Rhino model and would appreciate some help.

Rhino 7 SR29 2023-4-17 (Rhino 7, 7.29.23107.03001 on Windows 64

I provided a client with a 3d model of room data. I created rooms as objects and categorised them. I used the great Semantic plug in to create some custom data and showed the result (.3dm and .csv) in Power BI.

The client wanted me to flatten the rooms, so no 3d, and I am left with Surfaces (Think flat recatngles) . Rhino happily allows me to change the color of these objects, using Properties.Display Color. I can change individual or all . My problem is that I want the data (hex color) to export with my file and display in PowerBI. The problem I have is that as soon as I click Save, the objects (surfaces) change color to black. When I export, the surface displays as black In PowerBI.

Any help would be great !

Hi Barrie - save = save a Rhino file? Certainly that should not do anmything to object properties - can you post a simple example with a blow-by-blow to repeat what you are seeing?


Thank you Pascal,

Select Object. Rhino:“1 open surface added to selection”.

Go to Properties panel. Change Display Color to Red

Display Color is set to Red and Object Color correctly changes to Red

File. Save.

DIsplay Color of All Objects is immediately Set to Black

Alternatively File.SaveAs.“NewFileName”

Same result. DIsplay Color of All Objects is immediately Set to Black

Thank you for any assistance!

Hi Barrie - this is what should happen:

Please run SystemInfo in Rhino and copy/paste the results here.


Thank You!

I can reproduce what you did and it works fine. My Open surfaces are a legacy from a 3d model I created some time ago, where the client wanted a flat floorplan, where I flattened the extrusion.

Where you click on the surface, you change the color of the “stroke” or “border”. When I change color my surface changes the color of the “fill”, and this is what does not survive the Save.

Thank you !

Rhino 7 SR29 2023-4-17 (Rhino 7, 7.29.23107.03001, Git hash:master @ 5f05ef3a2eea3d910c4c2fb79ccc75b413d33ca7)
License type: Commercial, build 2023-04-17
License details: Cloud Zoo

Windows 11 (10.0.22621 SR0.0) or greater (Physical RAM: 64Gb)

Computer platform: LAPTOP - Plugged in [100% battery remaining]

Hybrid graphics configuration.
Primary display: Intel(R) UHD Graphics (Intel) Memory: 1GB, Driver date: 2-18-2022 (M-D-Y).
> Integrated graphics device with 4 adapter port(s)
- Windows Main Display is laptop’s integrated screen or built-in port
Primary OpenGL: NVIDIA GeForce RTX 3050 Ti Laptop GPU (NVidia) Memory: 4GB, Driver date: 3-8-2023 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 531.29
> Integrated accelerated graphics device (shares primary device ports)
- Video pass-through to primary display 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: 3-8-2023
Driver Version:
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 4 GB

Rhino plugins that do not ship with Rhino
C:\Users\barri\AppData\Roaming\Proving Ground\Semantic\Rhino7\Semantic.rhp “Semantic”

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 7\Plug-ins\Commands.rhp “Commands” 7.29.23107.3001
C:\Program Files\Rhino 7\Plug-ins\WebBrowser.rhp “WebBrowser”
C:\Program Files\Rhino 7\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 7\Plug-ins\RhinoScript.rhp “RhinoScript”
C:\Program Files\Rhino 7\Plug-ins\IdleProcessor.rhp “IdleProcessor”
C:\Program Files\Rhino 7\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 7.29.23107.3001
C:\Program Files\Rhino 7\Plug-ins\RhinoRender.rhp “Legacy Rhino Render”
C:\Program Files\Rhino 7\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 7.29.23107.3001
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\Alerter.rhp “Alerter”
C:\Program Files\Rhino 7\Plug-ins\RhinoCycles.rhp “RhinoCycles” 7.29.23107.3001
C:\Program Files\Rhino 7\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 7.29.23107.3001
C:\Program Files\Rhino 7\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 7\Plug-ins\RhinoBonusTools.rhp “Rhino Bonus Tools”

Hi Barrie - can you please post or send to a link back here in your comments) a model that shows the problem you are describing?


Thank you Pascal, fortunately, you have solved the problem.

You identified that the control worked with a new surface (I could replicate this) . SO, as I was preparing the file for you I realised that my objects must be being affected by a different attribute. That attribute is the Sematic plugin that we use . The plugin allocates a category to the objects we use. The category has a default color of black, and yes, all of our objects had a category assigned, which all used the default color, not the category.

Thank you So Much for your help. I cannot tell you the client, but this is a global company who will be very pleased, as am I

Thanks again, Barrie