Hello,
I am very new to MATLAB, so apologies in advance if this is a trivial question. My university has recently acquired a Structure Sensor 3 scanner, and we would like to use the 3D models to conduct source localisation. It looks like get_chanlocs is the perfect tool to get the locations of the channels on the 3D models, but I am running into issues when trying to open the models in EEGLAB.
After importing my EEG data (.bdf file, from a Biosemi system, 64 channels), I use the "Locate electrodes in a 3D head image" option. First, I am prompted to select my 3D model, where I choose the .obj file created with the 3D scanner. Then I am asked if I want to use a template; since I do not have one yet, I select "No, I will select locations in order". At this point, MATLAB gives me this error:

Unrecognized function or variable ‘placeFiducials’.
Error in get_chanlocs (line 177)
fiducials = placeFiducials(head_surface);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I think it means there is a function (placeFiducials) that the script is trying to use, but cannot find. But I am not sure where this function should be located. Am I missing a plugin, or could this be an issue with version compatibility?

I am currently using:
– MATLAB R2025b
– EEGLAB 2025.1.0
– FieldTrip 20250106

Installed EEGLAB plugins:
– Biosig v3.8.4
– ERPLAB v12.10
– clean_rawdata v2.11
– ICLabel v1.7
– firfilt v2.8
– dipfit v5.6
– EEG-BIDS v10.3
– get_chanlocs v4
– NFT v2.2

Thanks in advance if anyone can help me with this.Hello,
I am very new to MATLAB, so apologies in advance if this is a trivial question. My university has recently acquired a Structure Sensor 3 scanner, and we would like to use the 3D models to conduct source localisation. It looks like get_chanlocs is the perfect tool to get the locations of the channels on the 3D models, but I am running into issues when trying to open the models in EEGLAB.
After importing my EEG data (.bdf file, from a Biosemi system, 64 channels), I use the "Locate electrodes in a 3D head image" option. First, I am prompted to select my 3D model, where I choose the .obj file created with the 3D scanner. Then I am asked if I want to use a template; since I do not have one yet, I select "No, I will select locations in order". At this point, MATLAB gives me this error:

Unrecognized function or variable ‘placeFiducials’.
Error in get_chanlocs (line 177)
fiducials = placeFiducials(head_surface);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I think it means there is a function (placeFiducials) that the script is trying to use, but cannot find. But I am not sure where this function should be located. Am I missing a plugin, or could this be an issue with version compatibility?

I am currently using:
– MATLAB R2025b
– EEGLAB 2025.1.0
– FieldTrip 20250106

Installed EEGLAB plugins:
– Biosig v3.8.4
– ERPLAB v12.10
– clean_rawdata v2.11
– ICLabel v1.7
– firfilt v2.8
– dipfit v5.6
– EEG-BIDS v10.3
– get_chanlocs v4
– NFT v2.2

Thanks in advance if anyone can help me with this. Hello,
I am very new to MATLAB, so apologies in advance if this is a trivial question. My university has recently acquired a Structure Sensor 3 scanner, and we would like to use the 3D models to conduct source localisation. It looks like get_chanlocs is the perfect tool to get the locations of the channels on the 3D models, but I am running into issues when trying to open the models in EEGLAB.
After importing my EEG data (.bdf file, from a Biosemi system, 64 channels), I use the "Locate electrodes in a 3D head image" option. First, I am prompted to select my 3D model, where I choose the .obj file created with the 3D scanner. Then I am asked if I want to use a template; since I do not have one yet, I select "No, I will select locations in order". At this point, MATLAB gives me this error:

Unrecognized function or variable ‘placeFiducials’.
Error in get_chanlocs (line 177)
fiducials = placeFiducials(head_surface);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I think it means there is a function (placeFiducials) that the script is trying to use, but cannot find. But I am not sure where this function should be located. Am I missing a plugin, or could this be an issue with version compatibility?

I am currently using:
– MATLAB R2025b
– EEGLAB 2025.1.0
– FieldTrip 20250106

Installed EEGLAB plugins:
– Biosig v3.8.4
– ERPLAB v12.10
– clean_rawdata v2.11
– ICLabel v1.7
– firfilt v2.8
– dipfit v5.6
– EEG-BIDS v10.3
– get_chanlocs v4
– NFT v2.2

Thanks in advance if anyone can help me with this. get_chanlocs, eeglab, error: placefiducials MATLAB Answers — New Questions

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