ERROR

Ansys Mechanical opens, but the Messages pane shows the warning below. The graphics window shows a red "OpenGL < 4.3" label in the upper-right corner.

The application requires the use of OpenGL version 4.3. The detected version 1.1.0 does not meet this requirement. This discrepancy may produce graphical display issues for certain features. Furthermore, future versions of Mechanical may not support systems that do not meet this requirement.

The model may draw incorrectly or slowly, and some displays (result contours, section planes) may not work. The screen tears when you move the window.

Software & Version

Ansys Mechanical 2026 R1 on a Windows 11 virtual machine (VM) running on Proxmox VE, with no graphics card passed through to the VM. The error occurred over a Microsoft Remote Desktop (RDP) connection.
*This documented instance of this error occurred in this version but is not necessarily limited to this version.

Description/Cause

Mechanical needs OpenGL 4.3 or later to draw graphics. OpenGL version 1.1.0 is Windows' built-in basic renderer. Windows uses it when no graphics card driver supports OpenGL. This is common on virtual machines without a graphics card, and on some remote desktop sessions.

Mesa3D is a free, open-source OpenGL library. Its software renderer, llvmpipe, provides modern OpenGL using the computer's processor (CPU) instead of a graphics card. Placing Mesa3D in Mechanical's program folder lets Mechanical use it, without changing any other program on the computer.

*The cause(s)/solution(s) we identified in this documented instance may not be the only cause(s)/solution(s) for this error.

Solution

1. Download Mesa3D

1. Go to the Mesa3D for Windows releases page: github.com/pal1000/mesa-dist-win/releases.
2. Find a 25.x release, and under Assets, download the release-msvc.7z file, for example mesa3d-25.3.4-release-msvc.7z.
   
   Note: Use a 25.x release. The 26.x package we tested (26.2.6) does not include the OpenGL files Mechanical needs.
   
   Note: Windows Defender may block the downloaded release-msvc.7z file. If it does, allow the file.
3. Extract the downloaded file with 7-Zip: right-click the file, then select 7-Zip ➜ Extract to "mesa3d-25.3.4-release-msvc\".

2. Add Mesa3D to Mechanical

1. Close Mechanical, Workbench and all other Ansys applications.
2. In the extracted folder, open the x64 folder, and copy these two files:
   • opengl32.dll
   • libgallium_wgl.dll
   
3. Paste both files into Mechanical's program folder, and click Continue if Windows asks for administrator permission:
   C:\Program Files\ANSYS Inc\v261\aisol\bin\winx64
   
   Note: v261 is 2026 R1. For another version, use its folder instead, for example v252 for 2025 R2.

3. Set Mesa3D to Use Its Software Renderer

1. Open the Windows Start menu, search for "Edit the system environment variables", and open it.
2. Click Environment Variables.
3. Under "System variables", click New, and enter these values:

4. Click OK in each window to save, then restart the computer.

4. Verify the Fix Worked

1. Open Mechanical. If the Messages pane no longer shows the warning in the ERROR section above, and the model displays, you're done.
2. If Mechanical shows its loading screen and then closes, check that both files came from the same 25.x release, and that GALLIUM_DRIVER is set to llvmpipe. Correct them, restart the computer, and test again.
3. If Mechanical still closes, delete opengl32.dll and libgallium_wgl.dll from Mechanical's program folder. Mechanical then opens as it did before, with the warning.

Note: If Mechanical does not open at all, see ERROR - Ansys won't open / launch.