return c.r * c.r + c.g * c.g + c.b * c.b + c.a * c.a; }, 
return c.r * c.r + c.g * c.g + c.b * c.b + c.a * c.a; }, 
	length2Color: function(c){		return c.r * c.r + c.g * c.g + c.b * c.b + c.a * c.a;	},
5168	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5168/c7d2075e077f52d30bb22fd290f5cbb6f2dca879/lighting.js/clean/gfx3d/lighting.js