I am not sure that I am clear on what you are trying to do, but it sounds like you are clipping a FE mesh based on data located at the nodes.  This can be tricky because in a FE mesh you often times cannot simply remove one node, you have to remove the whole element or nothing at all.  So to avoid this you could convert your mesh to a point cloud (ConvertMeshtoPointCloud) and then clip the mesh based on the data.  This should give you the right number of nodes, but it will no longer be on a FE mesh.

Darrell

On Sep 21, 2011, at 10:22 AM, Yagna Pathak wrote:

> Hi,
>
> I have a vector of non-binary values that was generated in matlab. The indices of this vector are the node values that correspond to the pial surface. I then read it into scirun with the ReadMatrix and SetFieldData. When I try to display my individual patches from the vector with ClipFieldbyFunction, I tend to lose many of my nodes. How can I fix this problem? I checked on matlab, I should have around 3700 nodes, but with SCIRUN, I only get a display of 3300 nodes.
>
>
> Thanks,
>
> Yagna Pathak