If you (or manufacturer software like MSI Afterburner) have pushed your GPU clock speeds too high, the card might handle basic tasks fine but fail the specific initialization calls of a heavy renderer like Lumion.
Windows is blocking Lumion from accessing the necessary hardware resources. Step-by-Step Solutions to Fix the Error lumion failed to create dummy d3d9
To prevent the "dummy d3d9" error from returning, ensure your workstation adheres to these standard practices: If you (or manufacturer software like MSI Afterburner)
Lumion relies on legacy DirectX files to run its initial tests. If these files are broken, you must patch them. If these files are broken, you must patch them
This is the most frequent culprit, especially for laptop users. Lumion requires a high-performance dedicated graphics card and will crash if it tries to open using integrated graphics.
Lumion may crash if it mistakenly tries to use your computer's integrated Intel HD chip instead of your powerful dedicated graphics card.
Here is a comprehensive guide to understanding why this error happens and the exact steps you can take to resolve it. Understanding the Error: What Causes It?