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How to delete/alphadata values of 3d data outside polygon without change the dimensions of data

Asked by Shakir Hussain on 18 Mar 2019
Latest activity Edited by Shakir Hussain on 18 Mar 2019
We can delete the values of matrix outside polygon as
data = 12*17*6
x,y,S.X and S.Y are belongs to polygon
isin = inpolygon(X,Y,S.X,S.Y);
data(~isin) = [ ]
but it changes the dimension of data from 3d to single column
Secondly we can also use alphadata for 2d data easily as
imagesc(2ddata) 'AlphaData',~isin(2ddata))
1) How we can use the AlphaData for 3d data?
2) How we can delete values of 3d data outside polygon by keeping the data in same dimension

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