Fill polygon with NaN data

Hi, I have data matrix with NaN, and I want to fill the polygon colored. It seemed Matlab cannot close the polygon automatically, thus wouldn't color it.

X_data =

[13.3596   16.1477
 13.3596   16.1477
 21.1457   17.0037
 21.1457   20.0392
 13.3596   21.5270
 13.3596   21.5270
 13.3596   20.0392
     NaN   17.0037
     NaN   16.1477
     NaN   16.1477
     NaN   16.1477]

Y_data =

 [       0         0
    1.8725    1.8725
   16.9650    4.9160
   16.9650   13.2470
    1.8725   16.9662
         0   16.9662
         0   13.2470
       NaN    4.9160
       NaN    1.8725
       NaN         0
       NaN         0]

Z_data =

 [ -0.8831   -1.0298
   -0.8831   -1.0298
   -0.1197   -0.9071
   -0.3400   -0.3906
   -1.6715   -0.1558
   -1.6715   -0.3172
   -0.8831   -0.6376
       NaN   -1.3943
       NaN   -1.7909
       NaN   -1.7909
       NaN   -1.0298];

The figure I want should have two surfaces, defined by each column from the data. The presence of NaN make matlab only draws the outline for the surface; the second surface is ok. I used:

 fill3(X_data,Y_data,Z_data,'r')

Any suggestions? Thank you!

[Azzi Abdelmalek]

what is X_spars

[Gang-Gyoo]

How about using these codes

    fill3(X_data(1:7,1),Y_data(1:7,1),Z_data(1:7,1),'r')
    hold on
    fill3(X_data(:,2),Y_data(:,2),Z_data(:,2),'r')
    hold off
    grid on

[Pengfei]

Hi, Thanks! That actually helps. I didn't realize the small trick!