How to Find surface normals from a Point Cloud

I'm Working on a terrain mapping project on MATLAB using Kincet's Depth Data. I have processed the raw depth data to obtain the X, Y and Z coordinates. These coordinates are stored in a 3*307200 matrix where 1st row are X cordinates and so on. The scatter3 of the coordinates gives a pretty good reconstruction of the surroundings. I want to know how can I plot Normals to the surfaces. one possible method is to use principal component analysis taking one point and a few of its nighbours to find the normal to one small surface but i don not know how to implement it. I need Help

Answer 1

[Star Strider]

Consider the surfnorm function. You will have to create a surface first.

[Nagarjun Srinivasan]

i need some help on how to do that. Could u tell me the code required

[Star Strider]

The griddedInterpolant class of functions should create your surface. You will have to experiment with them to get result appropriate to your application.

[Nagarjun Srinivasan]

Thanks a lot

[Star Strider]

My pleasure!

[Yan Han]

hey there Nagarjun Srinivasan, how did you solve it in the end? I'm facing the same issue..