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View Full Version : xtk volume rendering with .vtk file created from matlab



chris_123
12-13-2012, 01:21 PM
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 ?