Using PXO

You may use PXO to generate 2D and 3D grain structures

OLD OLD VERSIONS !!

If for some reason that only you may be knowing, you wish to try out the grand old 2D version, try:

sunil anandatheertha (2021). Monte carlo simulation of two dimensional grain growth - code - version No. 1 (basic) (https://www.mathworks.com/matlabcentral/fileexchange/34784-monte-carlo-simulation-of-two-dimensional-grain-growth-code-version-no-1-basic), MATLAB Central File Exchange. Retrieved February 7, 2021.

While I am working to include a fast codes for 3D grain structure and characterization, you may use the very old version 3D code:

sunil anandatheertha (2021). Monte carlo simulation of three dimensional grain growth - code - version No. 1 (basic) (https://www.mathworks.com/matlabcentral/fileexchange/34985-monte-carlo-simulation-of-three-dimensional-grain-growth-code-version-no-1-basic), MATLAB Central File Exchange. Retrieved February 7, 2021.