Creating geometries in matlab

Hello all, I want to create a mesh-grid and then assign properties to few of the blocks (4 here ) as in the figure attached. Is it possible to do all these things in MATLAB, and can somebody help me with the commands required for this process.

[Shivangi]

Thanks for your response

After using vol3d I am getting an output like this

I put a condition as given below.

   if (((X_mid(cell)==2.5)&&(Y_mid(cell)==2.5)&&(Z_mid(cell)==2.5))) 
       A(i,j,k)= 1;
          else if (((X_mid(cell)==5.5)&&(Y_mid(cell)==5.5)&&(Z_mid(cell)==5.5)))
             A(i,j,k)= 4;
                 else A(i,j,k) = 0;
               end
            end

But these are not visible in the form of complete cube. Have I written code correctly? I want my results to be similar as in the above picture.

[Walter Roberson]

You have changed your code since your previous post, so I am not sure how you have created your values.

Answer 1

[Walter Roberson]

As I said in your other question on the same topic, you should be using vol3d v2 from the file exchange. Notice in the documentation:

In cases where voxels can be any RGB color, use: vol3d('CData', cdata); where cdata is an MxNxPx3 array, with RGB color along the 4th dimension. In cases where color and alpha values are highly independent, specify an MxNxP alphamatte as follows: vol3d('CData', cdata, 'Alpha', alpha);

So define a 3d alpha matrix that is 0 for each location where you have no data and 1 for each location you do have data.

Define a 4D matrix containing the color information. If it is easier for your purpose to define a 3d matrix with color index, then it not difficult to use that to index into a color map to produce a 4d matrix for vol3d purposes.