Hi,

Recently I ran into a problem regarding vtk surfaces created and saved with FreeView.

My goal is to mark brain lesions and to save the surface in the FreeSurfer surface format.

In the first step I generated the surface of the lesion in FreeView and saved it in vtk format. Secondly, I tried to convert the vtk surface with mris_convert in the surf format.

Unfortunately, I received the following error:

$ mris_convert Tubers.vtk Tubers.surf

MRISreadVTK: error parsing POLYGONS in file Tubers.vtk

mris_convert: could not read surface file Tubers.vtk

Please find the vtk file attached.

From comparisons with older vtk files generated by FreeView, I understood that recently polygons instead of triangles are defined in the vtk file. Is there a way to extract the surface triangles again?

Thanks,

Alex