Update README.md

README.md

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 * Phong shading with normal- and parallax occlusion mapping
 * Loadable preferences in XML
 * Resource management
-* 4 different light source types
+* 4 different working light source types
 * Directional light shadow mapping
 * Multi-Sample-Antialiasing
 * Anisotropic texture filtering
 
 ## Advanced Raytracing Features
 * Pathtracer
-* 8 different BSDFs with automatic material parameter based transitions
-* BVH and Line Space Datastructures per object
+* Physically based material and BSDF model
+* BVH and Line Space Datastructures per object, switchable with several thresholds
 * Primary ray generation via BVH or GBuffer
 * BVH containing the object's OOBBs
 * Automatic transformation and scene parameter application via the messaging system