function plhdb = plot3ers(x,y,z,w,t,xof,yof,col,thik)
% Ersatz fuer plot3
zrm = [cos(w) -sin(w) 0;  sin(w) cos(w) 0 ; 0 0 1];
yrm = [  cos(t) 0 -sin(t) ; 0 1 0;  sin(t) 0  cos(t) ];
trko = yrm*zrm*[x;y;z];
plhdb = plot(trko(2,:)+xof, trko(3,:)+yof,col,'LineWidth',thik); 
