return a.x * b.x + a.y * b.y + a.z * b.z; }, 
return a.x * b.x + a.y * b.y + a.z * b.z; }, 
	dot: function(a, b){		return a.x * b.x + a.y * b.y + a.z * b.z;	},
5168	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5168/c7d2075e077f52d30bb22fd290f5cbb6f2dca879/lighting.js/clean/gfx3d/lighting.js