how to define different shapes inside 3 d matrix and extract the points on boundary and its tangential direction?

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Sasi umaiyal 2017-11-17

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https://ww2.mathworks.cn/matlabcentral/answers/367598-how-to-define-different-shapes-inside-3-d-matrix-and-extract-the-points-on-boundary-and-its-tangenti

关闭： MATLAB Answer Bot 2021-8-20

i have a 3 D matrix(e.g: 521*161*521). now i need the trajectories of different shapes inside the matrix. for e.g: i need to draw the line, s-curve or circle inside the 3 D matrix. then i need to extract the boundary points of those shapes(x,y,z) and tangential direction of those points. if somebody can give suggestions that would be great.