added support for quad-only mode in obj loader (off by default), allows for using the internal fast update path
added support for quad-only mode in obj loader (off by default), allows for using the internal fast update path

Sjoerdie/embree,embree/embree,Sjoerdie/embree,embree/embree,Sjoerdie/embree,embree/embree,embree/embree,Sjoerdie/embree