Hardware Acceleration Troubleshooting
Graphics System
Use Plotters and Printers
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This chapter lists some of the known limitations or differences between using the OpenGL (OGL) or Direct 3D (D3D) driver when using hardware acceleration with AutoCAD.
- Spotlights are defined differently between D3D and OGL, so they will appear slightly different in the current viewport. The key difference is how the “hotspot” and “falloff” is displayed.
- Spotlights and point lights obey limits in D3D, but not in OGL.
- The intensity of full shadows in D3D is affected by the angle of incidence of the incoming light which is not the case in OGL. Thus, shadows will appear lighter and more “natural” looking in D3D than in OGL.
- If a graphics card supports Pixel Shader 3.0, full shadows are displayed with a higher quality with the D3D driver.
- D3D can vary shadow map detail based on available video memory while OGL cannot.
- Many hardware vendors do not support anti-aliased lines in their D3D drivers, so AutoCAD cannot support anti-aliasing for those cards.