Surf plot without interpolation

The x y coordinates of my data formed a T-shaped domain in stead of a rectangular domain.

[X,Y] = meshgrid(x,y);

Z = griddata(x,y,z, X, Y);

surf(X,Y,Z);

Using meshgrid and griddata will produce data out of the domain. How can i create s surf plot without interpolation? Or how to remove the extra data from the plot?

[Kean Yung]

Stuffing Nan did work on the T-shaped domain, but i need to do this on a Y-shaped domain as well. Is there any other simple ways?

Answer 1

[John D'Errico]

Stuff NaNs into the elements that are outside the area of interest. That part will not plot.