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4 changes: 2 additions & 2 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -62,8 +62,8 @@ This will download all PDFs and power-point slides into a folder called `resourc

## Light & Shadow

- [Shading Effects in Left 4 Dead 2 (2010)](http://www.valvesoftware.com/publications/2010/GDC10_ShaderTechniquesL4D2.pdf)
- [The Illustrative World of Team Fortress 2 (2008)](http://www.valvesoftware.com/publications/2008/GDC2008_StylizationWithAPurpose_TF2.pdf)
- [Shading Effects in Left 4 Dead 2 (2010)](https://steamcdn-a.akamaihd.net/apps/valve/2010/GDC10_ShaderTechniquesL4D2.pdf)
- [The Illustrative World of Team Fortress 2 (2008)](https://steamcdn-a.akamaihd.net/apps/valve/2008/GDC2008_StylizationWithAPurpose_TF2.pdf)
- [Hardware-Accelerated Global Illumination by Image Space Photon Mapping (2009)](http://graphics.cs.williams.edu/papers/PhotonHPG09/)
- [Ambient Occlusion Fields (2005)](https://mediatech.aalto.fi/~janne/aofields/)
- [Phong Illumination Model (2012)](http://www.cs.utexas.edu/~bajaj/graphics2012/cs354/lectures/lect14.pdf)
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