Export dwg Acad color index bug

Serengeti (Rhino BETA)
1

When I export to dwg, the autocad color index isn’t working.

I opened a fresh rhino file, added 4 lines, 1 per layer then exported to .dwg with “Color by AutoCAD index” enabled. I opened the file in Autocad and the layer colors are RGB values.

Screenshot 2026-07-13 103427
Screenshot 2026-07-13 103427673×855 34.9 KB

Screenshot 2026-07-13 104419
Screenshot 2026-07-13 1044192695×1087 51 KB

Rhino 9 SR0 2026-7-7 (Rhino 9 BETA, 9.0.26188.13293, Git hash:master @ ac87238b2f9b57fd23752c796764855762dd1390)
License type: Commercial, build 2026-07-07
License details: Cloud Zoo
Expires on: 2026-08-21

Windows 11 (10.0.26200 SR0.0) or greater (Physical RAM: 64GB)
.NET 10.0.2

Computer platform: DESKTOP

Standard graphics configuration using DirectX
Primary display: NVIDIA GeForce RTX 4090 (NVidia) Memory: 24GB, Driver date: 5-19-2026 (M-D-Y). DirectX(11)

Accelerated graphics device with 4 adapter port(s)

  • Secondary monitor attached to adapter port 0
  • Secondary monitor attached to adapter port 1
  • Secondary monitor attached to adapter port #2
  • Windows Main Display attached to adapter port #3

Secondary graphics devices.
Intel(R) UHD Graphics 770 (Intel) Memory: 2GB, Driver date: 10-18-2024 (M-D-Y).

Integrated graphics device with 4 adapter port(s)

  • There are no monitors attached to this device!

DirectX Settings
Safe mode: Off

OpenBLAS: OpenBLAS 0.3.30 DYNAMIC_ARCH NO_AFFINITY Haswell MAX_THREADS=64.

Rhino plugins that do not ship with Rhino
C:\Program Files\Bongo 2.0 (64-bit)\Rhino6\Bongo.20.rhp “Bongo 2.0”

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 9 WIP\Plug-ins\Commands.rhp “Commands” 9.0.26188.13293
C:\Program Files\Rhino 9 WIP\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 9 WIP\Plug-ins\RhinoScript.rhp “RhinoScript”
C:\Program Files\Rhino 9 WIP\Plug-ins\3dxRhino.9.rhp “3DxRhino.9”
C:\Program Files\Rhino 9 WIP\Plug-ins\export_ACAD.rhp “AutoCAD file export : export_ACAD”
C:\Program Files\Rhino 9 WIP\Plug-ins\AnimationTools.rhp “AnimationTools”
C:\Program Files\Rhino 9 WIP\Plug-ins\UpdatesAndStatistics\UpdatesAndStatistics.rhp “UpdatesAndStatistics” 9.0.26188.13293
C:\Program Files\Rhino 9 WIP\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 9.0.26188.13293
C:\Program Files\Rhino 9 WIP\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 9.0.26188.13293
C:\Program Files\Rhino 9 WIP\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 9 WIP\Plug-ins\MeshCommands.rhp “MeshCommands” 9.0.26188.13293
C:\Program Files\Rhino 9 WIP\Plug-ins\RhinoCycles.rhp “RhinoCycles” 9.0.26188.13293
C:\Program Files\Rhino 9 WIP\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 9 WIP\Plug-ins\SectionTools.rhp “SectionTools”

2

i was able to confirm in the latest, thanks for reporting RH-96976 Export DWG/DXF color radio buttons inverted

The two color radio buttons in the scheme dialog are wired backwards — the dialog shows “Color by AutoCAD index” selected when the scheme is actually set to RGB, and clicking it actually sets RGB. So your export was writing true color values even though the dialog said index. i tested before posting just to make sure, the exporter itself is fine once the right method is set.

Workaround until the fix lands: select “Color by RGB” in the scheme — the labels do the opposite of what they say, so that actually exports AutoCAD index colors.

This is Rhino 9 only, Rhino 8 is not affected.