[#D3D-2731] Updates shadowmap demo with normal bias
[#D3D-2731] Updates shadowmap demo with normal bias

normal exploding offset is another tool to fight shadow acne

cedricpinson/osgjs,cedricpinson/osgjs,jtorresfabra/osgjs,jtorresfabra/osgjs,cedricpinson/osgjs,jtorresfabra/osgjs