How can I convert an alpha Triangulation data to a grid?

I've got scattered velocity data (from particle tracking velocimetry - PTV) and had been using the griddata to interpolate results to a grid. However, I would instead like to interpolate to a grid ONLY the data within the alpha shape but aren't sure as how to do it. Any ideas?

Answer 1

[Roberto]

I found out a way to do it but I'm not sure this is the only way of doing it... Here's the code to get the data interpolated to a grid:

ugrid = griddata(x, y, u, xq, yq);

However, since my data has holes in it, I wanted to interpolate to the grid, ONLY the values from the alpha shape. Here's how I'm taking care of that:

shp = alphaShape(x, y);
in = inShape(xhp, xq, yq);
ugridin = ugrid;
ugridin(in==0) = NaN;