How can I generate 3D matrix for different shapes?

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Manu Francis 2017-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/372672-how-can-i-generate-3d-matrix-for-different-shapes

Hi,

I am trying to generate 3D matrices for different shapes as given in below figure like cylinders, cylinder with holes or donut shape etc.

I tried to generate cube with some inner cubes in 3D using following codes as below.

% numbers are arbitrary
cube=zeros(11,11,11);
cube(3:9,3:9,3:9)=5; % Create a cube inside the region
% Boring: faces of the cube are a different color.
cube(3:9,3:9,3)=2;
cube(3:9,3:9,9)=2;
cube(3:9,3,3:9)=2;
cube(3:9,9,3:9)=2;
cube(3,3:9,3:9)=2;
cube(9,3:9,3:9)=2;
vold3d('Cdata',cube,'alpha',cube/5)

and I got results as below

</matlabcentral/answers/uploaded_files/98386/shapes1.png> Even I could generate these shapes in cartesisan co-ordinate system. But I couldn't generate as matrix.

How can I generate 3D matrix for above mentioned shapes. This matrix can be 128x128x128 or512x512x512 size. Can anyone help