Adds faster shadow bias computation removing trig computation from shader
Adds faster shadow bias computation removing trig computation from shader

hishamabdelrahman/osgjs,hishamabdelrahman/osgjs,jmirabel/osgjs,gideonmay/osgjs,cedricpinson/osgjs,cedricpinson/osgjs,jtorresfabra/osgjs,jmirabel/osgjs,hishamabdelrahman/osgjs,kkuunnddaannkk/osgjs,jtorresfabra/osgjs,jtorresfabra/osgjs,jmirabel/osgjs,kkuunnddaannkk/osgjs,gideonmay/osgjs,gideonmay/osgjs,cedricpinson/osgjs,kkuunnddaannkk/osgjs