computing surface normal with x-, y- z- coordinates

Yan Han

2014 7 4

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hello there

i have the x-, y-, z- coordinates of 105 points of a surface and would like to compute the surface normal at each point. is there a way to do this? surfnorm and surf don't seem to work, because the vector z is a vector of z-coordinates and not a function of x and y.

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Roger Stafford 2014-7-5

To define a surface, your 105 points need to approximate a 2D space. That seems to contradict your assertion that your z is a vector. In other words, a point (x,y,z) on the surface needs to have neighboring surface points in two directions, not just one direction, in order to determine the normal direction there. Can you please elucidate?

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