Translations:Frequently asked questions/23/en

FreeCAD depends on OpenGL for displaying 3D contents, and therefore requires a working OpenGL environment. On some systems, OpenGL is not activated by default, and you might need to install or upgrade your graphics drivers. This problems happens most often on Linux systems or on virtual systems. If you are on a Linux-based system, try the following steps:
 * verify that your computer has a 3D-capable graphics board
 * type in a terminal window, and check in the output that Direct Rendering is set to "yes", and that the OpenGL vendor/renderer/version matches your graphics card.
 * install other OpenGL-based software (Blender, for example) and check if it runs and displays correctly.