xtk volume rendering with .vtk file created from matlab

问题

I am beginning with XTK. I would like to load a .vtk file in order to make volume rendering into XTK.

This .vtk file has been created with a matlab function which saves a 3D data array (voxel) into vtk format :

function savevtk(array, filename)
%  savevtk Save a 3-D scalar array in VTK format.
%  savevtk(array, filename) saves a 3-D array of any size to
%  filename in VTK format.
    [nx, ny, nz] = size(array);
    fid = fopen(filename, 'wt');
    fprintf(fid, '# vtk DataFile Version 2.0\n');
    fprintf(fid, 'Comment goes here\n');
    fprintf(fid, 'ASCII\n');
    fprintf(fid, '\n');
    fprintf(fid, 'DATASET STRUCTURED_POINTS\n');
    fprintf(fid, 'DIMENSIONS    %d   %d   %d\n', nx, ny, nz);
    fprintf(fid, '\n');
    fprintf(fid, 'ORIGIN    0.000   0.000   0.000\n');
    fprintf(fid, 'SPACING    1.000   1.000   1.000\n');
    fprintf(fid, '\n');
    fprintf(fid, 'POINT_DATA   %d\n', nx*ny*nz);
    fprintf(fid, 'SCALARS scalars float\n');
    fprintf(fid, 'LOOKUP_TABLE default\n');
    fprintf(fid, '\n');
    for a=1:nx
        for b=1:ny
            for c=1:nz
                fprintf(fid, '%d ', array(a,b,c));
            end
            fprintf(fid, '\n');
        end
    end
    fclose(fid);
return

Once the 'output.vtk' file is created, I try to load it this way :

window.onload = function() {

var r = new X.renderer3D();
r.init();

// create a mesh from a .vtk file
var skull = new X.mesh();
skull.file = 'output.vtk';

// add the object
r.add(skull);

// .. and render it
r.render();

};

But nothing displays in the browser.

Is my 'output.vtk' is not a valid .vtk file for volume rendering ?

How to load into XTK this kind of file ?

回答1:

the XTK code looks good but the vtk format usually doesn't have more than 1 space between values. I think that's the problem.

来源：https://stackoverflow.com/questions/13867422/xtk-volume-rendering-with-vtk-file-created-from-matlab

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matlab

vtk

xtk