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public static Vector3D multipliziereMatrixmitVector(Matrix a,Vector3D b) {
		
	int m = a.getColumns();
	int n = a.getRows();
	    
	Vector3D vec = new Vector3D(4,0.0f,0.0f,0.0f,0.0f);
	    
	 for (int spalte = 0; spalte < m; spalte++) {
	    for (int zeile = 0; zeile < n; zeile++) {
	         vec.vector[zeile] +=  (a.getMatrix()[zeile][spalte] * b.vector[zeile]);
	    }
	}
	    
        return vec;
}