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2150 mathias 1 
if(!dojo._hasResource["dojox.gfx3d.vector"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojox.gfx3d.vector"] = true;
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dojo.provide("dojox.gfx3d.vector");
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dojo.mixin(dojox.gfx3d.vector, {
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	sum: function(){
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		// summary: sum of the vectors
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		var v = {x: 0, y: 0, z:0};
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		dojo.forEach(arguments, function(item){ v.x += item.x; v.y += item.y; v.z += item.z; });
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		return v;
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	},
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	center: function(){
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		// summary: center of the vectors
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		var l = arguments.length;
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		if(l == 0){
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			return {x: 0, y: 0, z: 0};
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		}
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		var v = dojox.gfx3d.vector.sum(arguments);
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		return {x: v.x/l, y: v.y/l, z: v.z/l};
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	},
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	substract: function(/* Pointer */a, /* Pointer */b){
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		return  {x: a.x - b.x, y: a.y - b.y, z: a.z - b.z};
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	},
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	_crossProduct: function(x, y, z, u, v, w){
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		// summary: applies a cross product of two vectorss, (x, y, z) and (u, v, w)
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		// x: Number: an x coordinate of a point
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		// y: Number: a y coordinate of a point
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		// z: Number: a z coordinate of a point
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		// u: Number: an x coordinate of a point
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		// v: Number: a y coordinate of a point
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		// w: Number: a z coordinate of a point
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		return {x: y * w - z * v, y: z * u - x * w, z: x * v - y * u}; // Object
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	},
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	crossProduct: function(/* Number||Point */ a, /* Number||Point */ b, /* Number, optional */ c, /* Number, optional */ d, /* Number, optional */ e, /* Number, optional */ f){
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		// summary: applies a matrix to a point
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		// matrix: dojox.gfx3d.matrix.Matrix3D: a 3D matrix object to be applied
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		// a: Number: an x coordinate of a point
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		// b: Number: a y coordinate of a point
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		// c: Number: a z coordinate of a point
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		// d: Number: an x coordinate of a point
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		// e: Number: a y coordinate of a point
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		// f: Number: a z coordinate of a point
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		if(arguments.length == 6 && dojo.every(arguments, function(item){ return typeof item == "number"; })){
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			return dojox.gfx3d.vector._crossProduct(a, b, c, d, e, f); // Object
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		}
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		// branch
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		// a: Object: a point
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		// b: Object: a point
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		// c: null
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		// d: null
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		// e: null
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		// f: null
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		return dojox.gfx3d.vector._crossProduct(a.x, a.y, a.z, b.x, b.y, b.z); // Object
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	},
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	_dotProduct: function(x, y, z, u, v, w){
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		// summary: applies a cross product of two vectorss, (x, y, z) and (u, v, w)
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		// x: Number: an x coordinate of a point
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		// y: Number: a y coordinate of a point
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		// z: Number: a z coordinate of a point
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		// u: Number: an x coordinate of a point
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		// v: Number: a y coordinate of a point
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		// w: Number: a z coordinate of a point
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		return x * u + y * v + z * w; // Number
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	},
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	dotProduct: function(/* Number||Point */ a, /* Number||Point */ b, /* Number, optional */ c, /* Number, optional */ d, /* Number, optional */ e, /* Number, optional */ f){
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		// summary: applies a matrix to a point
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		// matrix: dojox.gfx3d.matrix.Matrix3D: a 3D matrix object to be applied
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		// a: Number: an x coordinate of a point
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		// b: Number: a y coordinate of a point
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		// c: Number: a z coordinate of a point
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		// d: Number: an x coordinate of a point
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		// e: Number: a y coordinate of a point
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		// f: Number: a z coordinate of a point
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		if(arguments.length == 6 && dojo.every(arguments, function(item){ return typeof item == "number"; })){
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			return dojox.gfx3d.vector._dotProduct(a, b, c, d, e, f); // Object
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		}
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		// branch
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		// a: Object: a point
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		// b: Object: a point
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		// c: null
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		// d: null
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		// e: null
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		// f: null
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		return dojox.gfx3d.vector._dotProduct(a.x, a.y, a.z, b.x, b.y, b.z); // Object
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	},
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	normalize: function(/* Point||Array*/ a, /* Point */ b, /* Point */ c){
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		// summary: find the normal of the implicit surface
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		// a: Object: a point
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		// b: Object: a point
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		// c: Object: a point
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		var l, m, n;
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		if(a instanceof Array){
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			l = a[0]; m = a[1]; n = a[2];
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		}else{
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			l = a; m = b; n = c;
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		}
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		var u = dojox.gfx3d.vector.substract(m, l);
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		var v = dojox.gfx3d.vector.substract(n, l);
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		return dojox.gfx3d.vector.crossProduct(u, v);
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	}
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});
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}