DirectX is the bridge between software and your GPU. Even if you have the latest Windows, some legacy runtimes might be missing.
The error means Lumion is unable to initialize a basic Direct3D 9 (D3D9) interface, which it uses to verify graphics capabilities. This can happen due to: . Missing DirectX Runtimes . lumion failed to create dummy d3d9
: Right-click the desktop > NVIDIA Control Panel > Manage 3D Settings > Program Settings. Add Lumion and set it to High-performance NVIDIA processor . DirectX is the bridge between software and your GPU
If your PC has both an integrated and a dedicated GPU, Lumion may be defaulting to the weaker one. it may trigger a D3D error.
If Lumion tries to launch at a resolution your monitor doesn't support, it may trigger a D3D error.