Traingular mesh, face normals plotting

I have imported a stl file to Matlab and meshed it. After triangular meshing, I need to calculate and plot surface normal for each traingular face of the meshed figure. How to proceed?

Answer 1

[KSSV]

You can use the function facenormal. Read it here: https://in.mathworks.com/help/matlab/ref/triangulation.facenormal.html