[vtkusers] pixel cordinates

[EDSB EDSB]

Hello all,
I have a binary volume image (that is available both in dicom and in metaimage format)where there are some non-zero pixel representing a line in the 3D space.
I need their cordinates (to put as input in a vtkPoints class) in order to interpolate them by a spline. 
I have no idea how to achieve this goal. I try to use vtkThresholdTextureCoords but I was not able to extract the infomation I need.
could anyone give me some suggestion?


Thanks in advance and sorry for my beginner question.

I appreciate any help,

Mary
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