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  1. How can I find for every point, which one of its 8 surrounding points (not only out of the 4 neighbours)(pic.2) has the maximum value of an attribute ? I want to create a vector at each point that points to the direction that the attribute increases(pic.1) I believe this is called Attibute Gradient. I want to achieve that in VOPS. I have made some progress but something is not right.(pic.3) I know for sure that one of my mistakes, is that when ask from pcopen the 8 closest points, one of them is the lookup point itself.. How do I exclude it? Any help or idea is more than welcome!!! Attribute Gradient 1.hipnc
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