extract isosurface data in 3D volume data array

Hi,

I am trying to calculate isosurface data from a volume data - 'celldata'. celldata is a 201x201x201 array.

When I use,

    unique(celldata)

it gives that the array has only values of 0,0.0001,0.95 and 1.

Now that I want to visualise 0.0001, 0.95, and 1 separately using isosurface.

I used this function for the celldata type "1", but I in the plot I don't see the data which contains 1.

     patch(isosurface(kkk,1),'FaceColor','red,'EdgeColor','None','FaceAlpha',0.2);

I can't see anything visually in the graph.

Have I defined isosurface incorrectly?

Could you please have a look?

Thanks Ashan