Problem loading dream 3d file

[joaonado]

I'm having a error when trying to load a .dream3d file.
here is the code I'm using(Is the same that is on the 3d gains topic on the documentation but I changed the file path to my local file):

% specify the file name
fname = "My_File_path";
grains = grain3d.load(fname);

% for triangulated data sets it may be useful to plot them without lines
plot(grains,grains.meanOrientation,'LineStyle','none','micronbar','off')

% use a nice plotting convention
how2plot = plottingConvention.default3D;
setCamera(how2plot)

Error message:
Error using [loadGrains_Dream3d] [line 38]
The file does not contain any grain information.

Error in [grain3d.load][line 49]
      grains = loadGrains_Dream3d(filepath,varargin{:});

Error in [test_3d][line 5]
grains = grain3d.load(fname);

It says that the file does not contain grain information but I loaded the file on a HDF viewer and it does have both pixel information and grain data (looked it in this website:https://hdfviewer.com/)
I also loaded the file on Paraview and it does work fine.
Here you can donwload a small example data set:https://github.com/joaonado/small-dream-3d-example-data-set

I used MTEX6.1 and MTEX6.1.1
I'm running MATLAB R2025a

If someone has any idea on how to solve this problem please let me know.

[ralfHielscher]

Sorry for the late reply. MTEX 7.1 raised this error whenever it did not find a surface mesh where it expected one, either because the file has none or because DREAM3D-NX stores it under different names. MTEX 7.2 locates the data by the names of the data sets, and computes the grains from the voxel data for a file without a mesh, i.e., grain3d.load(fname) returns calcGrains(ebsd,'grainId') with the feature ids of DREAM.3D as grains.

Meshes of the current DREAM3D-NX additionally need the fix of #2633: lines 50-51 of interfaces/loadGrains_Dream3d.m, fixed on develop in d47868c. If your file still fails, please post the output of h5disp(fname,'/','min').

Ralf.