3D grid from a large 3D matrix

I have a 3D matrix, .mat file attached in this thread, which has a 200x200x600 matrix has 5021 non-zero values and 23.9 million zero values.

It is a cuboid grid (x and y = -200:200 and z = -600 to 600) that contains charge data.I used the vol3d v2 function to visualize the 3D cuboid grid that I have, however the number of zero values dilute the non-zero values making it unable to observe the grid properly.

I believe obtaining a slice of the grid at x=y=0 would provide some insights as how the charge is distributed (this is a charge grid), however I am unable to create a meshgrid for the co-ordinate axes where x=y=-200:200 and z=-600:600

The in-built MATLAB app - volumeViewer yeilds a similar result. Hope you could provide some direction, I have attached the .mat file containing the 200x200x600 matrix if it is any help.

Answer 1

[KSSV]

load Q3D.mat ; 
x = linspace(-200,+200,200) ; 
y = linspace(-200,+200,200) ; 
z = linspace(-600,+600,600) ; 
[X,Y,Z] = meshgrid(x,y,z) ; 
% give your range 
xslice = [50:100] ;
yslice = [] ;
zslice = 0 ;

slice(X,Y,Z,Q3D,xslice,yslice,zslice)

[Hans123]

Thanks KSSV this works as I want it to, however I am using the vol3 v2 function

and I want to slice that grid in half. This slice function basically creates a plane in the middle of the grid

H = vol3d('cdata',Q3D,'texture','3D')

[KSSV]

You can give your required coordinates in xslice, yslice and zslice.

[Hans123]

The slice shows a complete black plane - where there should be non-zero data and majority zero data. Could you help point out the reason for this

[Hans123]

^I managed to fix that issue, my mesh is too fine. I set my edgecolor to non. Thanks KSSV

[KSSV]

Hey perfect.....yes edgecolor is an option...also try shading interp after plot.