Hi,
Have used vmtkcenterline geometry to calculate tortuousity of a carotid artery. Output runs fine; the file is written under .vtp extension as in tutorial. However, I want numbers that relate to tortuousity, curvature etc, and no idea how to get these data.
If you want tortuosity, you should use vmtkbranchgeometry.
vmtkcenterlinegeometry produces pointwise curvature and torsion as point data arrays. Easiest way of accessing these is probably through the python/numpy interface.
You can convert it to a .dat file as well which will be a spreadsheet of these values, but unless you have a simple geometry this is going to be difficult to process.