Plot projections on XY , XZ , YZ planes of 3D volume ( triangulated set of samples of 3D body's surface ) using contour function

Hello,

I have 3 vectors x_ , y_ , z_ of surface samples of some 3D body that I succeed to approximately plot using matlab by following script sequence:

    figure
    tri = delaunay3(x_,y_,z_);
    axis tight;
    hold on;
    grid on;
    trisurf(tri,x_,y_,z_);hold on;
    shading interp;
    shadow(1);
    ...
    shadow(6);

using shadowplot from :

http://www.mathworks.com/matlabcentral/fileexchange/6400-SHADOWPLOT

I am trying to add necessary custom changes to shadowplot function in order to draw projections using contour as in : http://fileslap.com/94s/plot_

inside shadowplot function points for projections got using next commands:

a.get handle:

    kidsp = findobj(hAx,'Type','patch');

b.get patch (graphics object):

    for ii=1:length(kidsp)
        hPat = kidsp(ii);

c.get patch data:

    patdata = get(hPat,{'XData','YData','ZData'});

size of each patdata{1-3} is 4 on 1255 for the instance.

Inside the shadowplot function the shadows are drawn ok using next command:

    hp(ii) = patch(patdata{1},patdata{2},patdata{3},[.1 .1 .1]);

Does anybody know what points and how to get them from patdata{..} structure should be passed to contour(...) function to draw the projections as in

http://fileslap.com/94s/plot_

? Thanks in advance.