Indirect Diffuse and Glossy Illumination on the GPU
                                  István Lazányi and László Szirmay-Kalos
                                                TU Budapest


           Contact | Abstract | System requirements | Controls | Troubleshooting | Documentation

Contact

	+-----------------------------------------------------------------------------------+
	|      IF YOU EXPERIENCE TECHNICAL PROBLEMS OR YOU WOULD LIKE TO INTEGRATE THE      |
	|  SOURCE CODE INTO YOUR APPLICATION, DO NOT HESITATE TO CONTACT US FOR ASSISTANCE. |
	+-----------------------------------------------------------------------------------+
	|                   MAILTO: ilazanyi@freemail.hu, (szirmay@iit.bme.hu)              |
	+-----------------------------------------------------------------------------------+

Abstract 

We present a fast approximation method to obtain the indirect diffuse or glossy reflection on a dynamic object, caused by a diffuse or a moderately glossy environment. Instead of creating a diffuse/specular irradiance map with precalculated values we perform all calculations on the fly. Supposing that the environment map representing the environment is downsampled, the method can run in real-time and provide visually pleasing results. 

System requirements

Pixel shader 3.0 compatible video card with DirectX 9c driver. DirectX SDK, Visual Studio .NET 2003 to build the source code.

Controls
				      APPLICATION CONTROLS
				
				F1: Display this help text
				Quit: ESC
				F8: Switch to Wireframe mode
				
				Left click+drag: Rotate mesh
				Mouse wheel: Zoom
				Arrow keys: Move object
				
				L: [L]oad params
				S: [S]ave params & take SCREENSHOT
				R: [R]eset params
				
				      MESH OBJECT CONTROLS
				
				O: show 3 mesh [O]bjects
				F: show [F]ireballs
				Ins, Del: scale mesh object
				Home, End, or 0-9: choose mesh object
				gray +,-: adjust intensity
				gray /,*: adjust specular shininess
				
				    ALGORITHM-SPECIFIC CONTROLS
				
				TAB,Q: choose shading method
				N,M: choose cube map resolution
				A: refresh cube maps for every frame
				SPACE: refresh cube maps MANUALLY
				C: choose visualized [C]ube map

Troubleshooting

- display driver

If you experience strange errors or artifacts, the first thing to do is to to update your display driver.

- DirectX SDK

The application was tested with the following Microsoft DirectX 9.0 SDK versions:
  - Oct 2005 (during development)
  - Jun 2006 (final testing)

Porting to the new version was achieved by simply updating the DXUT files in the Common folder. To generate these files, we started the DirectX Sample Browser, and installed an EmptyProject(C++) project. The generated Common subfolder was used then to replace the old DXUT files. Otherwise, an error message "Incorrect version of Direct3D and/or D3DX." is displayed.

Documentation

We hope that you find the enclosed Doxygen documentation useful.