Direct3D is one of the components of Microsoft DirectX that utilizes the video card or graphics processing unit in rendering 3D graphics. This includes support for z-buffering, alpha blending, mipmapping and anti-aliasing. Many 3D games and applications use these Direct3D features to ensure the visuals look as detailed or realistic as possible. Any graphical problems you may experience in your favorite applications can relate to Direct3D issues. To make sure, test the Direct3D acceleration using the DirectX Diagnostic Tool.
Bring up the "Run" dialog by clicking the Start button and then going to "Run." Type "dxdiag" and click "OK" to launch the DirectX Diagnostic Tool.
Wait for the DirectX Diagnostic Tool to initialize, and then click the "Display" tab to see the current status and specifications of your display device.
Click "Test Direct3D" to begin testing your video card for errors. Follow the instructions on your screen to complete the test.
You can also see if your Direct3D function works by trying out any application or game that depends on Direct3D. Check the system requirements of the game or application and see if it requires DirectX in order for it to function. Look in the program or game options and activate the Direct3D mode or setting if available to force your video card to render the application or game using Direct3D.