Import Grains from Dream3d problem

[Djazzair]

What do you want to do?
Import a Dream3D file

What code do you use?
3D grain's tutorial code :

% specify the file name
fname = fullfile(mtexDataPath,'EBSD','SmallIN100_MeshStats.dream3d');
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>h5read_multi (line 95)
component or dataset not found.

try h5info(fname) to get the structure of your file

Error in loadGrains_Dream3d (line 35)
activeGrains = logical(h5read_multi(fname, activePath))';

Error in grain3d.load (line 51)
      grains = loadGrains_Dream3d(filepath,varargin{:});

Error in Dream3DMatlab (line 28)
grains = grain3d.load(fname);

What MTEX version do you use?
MTEX 6.0.0

[kilir]

Hi,
could it be that your data is not where you specify it to be?
Cheers,
Rüdiger

[Djazzair]

Hi,

I ruled this out before writting this post because h5info does read the data correctly :

Name: '/'
Groups: [3×1 struct]
Datasets: []
Datatypes: []
Links: []
Attributes: [2×1 struct]

Thanks
Ryan

[lauragondu]

Hi,

I'm having the same problem. Mtex finds the file but it's not finding the data in my Dream3D file. Did you solve it Ryan?

Thank you
Laura

[Brian-Liu-rx]

Hi,
I'm having the same problem. Did you solve it?
Brian

[ralfHielscher]

The command h5info shold give the following

xxx = h5info(fileName);
xxx.Groups(1).Groups.Name

ans =

    '/DataStructure/DataContainer'


ans =

    '/DataStructure/TriangleDataContainer'

Ralf.

[Brian-Liu-rx]

Hi,
I'm having the same problem. Did you solve it?
Brian

[kilir]

Hi,
can you upload a small dataset in order to reproduce your observation?
Cheers,
Rüdiger

[Brian-Liu-rx]

Hi, Rüdiger,

Here is my .dream3d file. https://github.com/1585004697/Dream3d
Could you check it out and tell me if it works?
Thanks!
Brian

[ralfHielscher]

I checked your data and there are no grain information stored.

[Brian-Liu-rx]

Hi, Ralf,
This file is generated by Dream3D NX following official tutorial. It can be opened and visualized properly in Paraview.
I don‘t know why the data structure can not be recognized in Matlab or Mtex.

Brian

[Brian-Liu-rx]

Hi, Ralf, This file is generated by Dream3D NX following official tutorial. It can be opened and visualized properly in Paraview. I dont know why the data structure can not be recognized in Matlab or Mtex. Brian

…

---- Replied Message ---- | From | Ralf ***@***.***> | | Date | 09/24/2025 03:46 | | To | ***@***.***> | | Cc | ***@***.***>***@***.***> | | Subject | Re: [mtex-toolbox/mtex] Import Grains from Dream3d problem (Discussion #2362) | The command h5info shold give the following xxx = h5info(fileName); xxx.Groups(1).Groups.Name ans = '/DataStructure/DataContainer' ans = '/DataStructure/TriangleDataContainer' Ralf. — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you commented.Message ID: ***@***.***>

[Brian-Liu-rx]

Hi, Ralf,
It seems still not work with MTEX 6.1

fname = fullfile(mtexDataPath,'EBSD','SmallIN100_Final.dream3d');
grains = grain3d.load(fname);

error in loadGrains_Dream3d
The file does not contain any grain information.

Brian

[ralfHielscher]

Hi Brian,
because all the dream3d data files for some reason have the same file name (why is this?) I mixed your data with the data from somebody else. I rechecked you data - and it does not contain grain information. You can easily check it yourself by

header = h5info(fileName);
header.Groups(1).Groups.Name

This should give

ans =
    '/DataStructure/DataContainer'
ans =
    '/DataStructure/TriangleDataContainer'

DataContainer only contains the EBSD data and TriangleDataContainer the triangulation. Most likely you have to tell Dream3d to include this into the export.
Ralf.

[Brian-Liu-rx]

Hi Ralf.
Could you send me a correct file data as an example, which can be well opened by grain3d.load?
Thanks!
Brian

[Brian-Liu-rx]

And this is the Data structure in Dream3D:

[psmgamerhell]

@ralfHielscher does it mean that DREAM3D data need to be surface meshed before reading into MTEX v6.1?