## Techniques for shadow maps

### Light-Space Perspective Shadow Map (LiSPSM)
* 20004 - "Light Space Perspective Shadow Maps" by Michael Wimmer, Daniel Scherzer and Werner Purgathofer ([pdf](https://www.cg.tuwien.ac.at/research/vr/lispsm/shadows_egsr2004_revised.pdf))
* [implementation](https://github.com/nkrisztian89/interstellar-armada/commit/53f4284b38a83aae87e2a40e98f5c4461cead1e9)  in "Interstellar Armada"
* [implementation](https://github.com/openscenegraph/OpenSceneGraph/blob/34a1d8bc9bba5c415c4ff590b3ea5229fa876ba8/include/osgShadow/LightSpacePerspectiveShadowMap) in OpenSceneGraph
