I want to create some 3D structuring elements (such as an oblate spheroid) to use with imdilate. I'd like to see them with isosurface and I've tried the examples in the isosurface documentation, e.g.,
BW = false(100,100,100);
BW(25,25,25) = true;
BW(75,75,75) = true;
se = strel('sphere',25);
dilatedBW = imdilate(BW,se);
figure
isosurface(dilatedBW);
which works just fine:
However, if I make the sphere smaller (se = strel('sphere',20);) then the figure shows nothing:
(even if I change the all the axis ranges to 1:100.) In fact, any sphere smaller than 24 does not display, but larger spheres (30, for example) display properly. In a similar vein, if I start with just one initial point in BW and dilate, some initial points display properly (BW(25,25,25) = true;) but others (BW(50,50,50) = true;) don't! I've tried changing the colormaps, adjusting the axis ranges - what an I missing?
(Using version 2016a)
Thanks for any advice ...
