[Insight-users] DeformableMesh3DFilter with an open mesh

[Georgi Diakov]

Dear All,

I have aplied the DeformableMesh3DFilter to segment bone from CT images.
The initial mesh is a result from thresholding and marching cubes
triangulation. It is an open surface, e.g. only a patch, delineating a
region on the bone. If the number of iterations is set high enough
value, in order to reach convergence, the whole mesh gets shifted into
the corner of the image. 
1. Does anybody know, if the reason for that shift could be, that the
mesh is not a complete closed surface?
2. Is there a way to limit the range of influence of the gradient
forces, so that they affect only nodes, which are in close neighbourhood
of the contour? Could this be done with reducing the GradientMagnitude?
Actually, reducing the GradientMagnitude only diminishes the
deformation; I haven't established an influence on the range of effect
of the forces.

Thanks for the help!
Georgi