MetalByTutorials/19-shadows/references.markdown

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## References
### Screen Space Ambient Occlusion
[http://ogldev.atspace.co.uk/www/tutorial45/tutorial45.html](http://ogldev.atspace.co.uk/www/tutorial45/tutorial45.html)
[https://learnopengl.com/Advanced-Lighting/SSAO](https://learnopengl.com/Advanced-Lighting/SSAO)
### Shadow Volumes
[http://developer.download.nvidia.com/books/HTML/gpugems/gpugems_ch09.html](http://developer.download.nvidia.com/books/HTML/gpugems/gpugems_ch09.html)
[http://ogldev.atspace.co.uk/www/tutorial40/tutorial40.html
](http://ogldev.atspace.co.uk/www/tutorial40/tutorial40.html)
### Percentage Closer Filtering
[http://ogldev.atspace.co.uk/www/tutorial42/tutorial42.html
](http://ogldev.atspace.co.uk/www/tutorial42/tutorial42.html)