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[FAQ]

Fluent 19.x and 18.x now tries to use the “OpenGL” driver in more situations than before (previously we were using the x11 driver even in situations where the OpenGL driver was possible). This causes problems in configurations which do not support OpenGL properly. You can fall back to the x11 driver with the “-driver x11” option, or by specifying the HOOPS_DRIVER environment variable with a value of x11. To attempt to resolve this, verify that you are using a supported graphics card and update the graphics card drivers (directly from the graphics card vendor website). If the issue persists, you can do one of the following: set the DISPLAY to a local machine; set the LD_PRELOAD environment variable to /usr/lib64/libstdc++.so.6; or use the alternative drivers x11 or null (either by defining it in the HOOPS_DRIVER environment variable or using the -driver x11 Fluent command line option).