# How to display a 2D square as a 3D cube

8 views (last 30 days)
Elysi Cochin on 19 Mar 2022
Edited: Elysi Cochin on 23 Mar 2022
How can i display the attached 2D square input as a 3D cube from?
I used the same image in all slice. But the display is not clear.
Please can someone help me with displaying

Abolfazl Chaman Motlagh on 19 Mar 2022
Edited: Abolfazl Chaman Motlagh on 19 Mar 2022
Use volshow function :
thisSlice = double(thisSlice);
thisSlice = (thisSlice-min(thisSlice(:)))/(max(thisSlice(:))-min(thisSlice(:)));
thisSlice = uint8(255*thisSlice);
volSlice = repmat(thisSlice,[1,1,100]);
queryPoints = 0:255;
alpha = [0 0.01 0.02 .05 0.9];
intensity = linspace(0,255,5);
alphamap = interp1(intensity,alpha,queryPoints)';
volshow(volSlice,'Alphamap',alphamap)
change Alphamap and Colormap option of volshow to have better representation for your application. there is a simple example in documentation of dicomreadvolume in MATLAB documentation.
the image in final step :
3D volumetric plot :
Abolfazl Chaman Motlagh on 20 Mar 2022
as i said earlier, you can change alphamap and colormap to see what is best illustration for your work.
for example if you don't use any option even dark pixels have intensity in volumentric figure:
volshow(volSlice)
but for example a little more precise number would be this: (i see that most pixel in box have intensity grater than 130 in 8bit image so i did this:)
queryPoints = 0:255;
alpha = [0 0.01 0.02 .6 1 1];
intensity = [0 50 100 130 200 255];
alphamap = interp1(intensity,alpha,queryPoints)';
volshow(volSlice,'Alphamap',alphamap)