Creating vectors through patches

Hi everybody.

I have 1 or like 2 problems in Matlab, I cannot solve.

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1) I've got a part from Abaqus, "imported" into Matlab, with some colored patches. Here 2 examples of what I got:

http://fs2.directupload.net/images/141221/oqho2u8p.png

http://fs2.directupload.net/images/141221/334lqmfw.png

(All but the mesh was made in MS paint, but I think it's enough to explain my problem here. Of course there are smooth transition within the colors, labeled with values between 0 (dark blue) and 1 (dark red). The meaning of the colors doesent matter then, they just represent 0, 0.1, 0.3451 ... , 1.). Each node is labeled by a number, I know the position of each node of the mesh in X Y Z, and I know each value between 0 and 1 for each node.

Now I want to create a vector or vector field in these parts. These vectors should run from one patch to another, starting and ending outside or on the edge of the part / mesh. It would be nice, if they prefer running through parts of the patches in the blueish regions (draw near parts of the value 0). Here again 2 pictures that hopefully explain what I mean:

http://fs1.directupload.net/images/141221/kn8av4vz.png

http://fs2.directupload.net/images/141221/vpks2h22.png

I'm quite new to Matlab and learned it by myself. So I haven't any idea how to solve this problem. I hope you can give me at least some advices or ideas.

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2) When the first problem is solved, I need to know which nodes are touched by the vectors, so I can "select" them. Do you have any idea?

Greetings

[Oleg Komarov]

A few suggestions: ask one question at a time, provide some sample input and what you have attempted so far. Now, for the problem you can find the centroids of your patches and fit a polynomial through it. However, it is not clear what are the rules that determine which patches will be linked by a vector and which should not.