The normal value for icloud data point

Hello,

Im working on 3D modeling and i have some overlapped objects in single image. I want to calculate the normal value for this objects. Is there a way to do it? How can i do it?

[Hasan Kaplan]

image looks like this

[Walter Roberson]

What do you mean by the "normal value" ?

https://www.mathworks.com/help/matlab/ref/surfnorm.html

[Hasan Kaplan]

the direction of a surface normal vector at a point

[Walter Roberson]

Then surfnorm()

[Hasan Kaplan]

So basically to create the surface? But then the surface will be huge?

[Walter Roberson]

Do you need to calculate the normal value for all the points, or only for a relative few of them?

Calculating surface normals requires that you have already (somehow) resolved down which points are on the "surface", and which other points they are connected to. It is not, in itself, a technique that you can use to determine which cluster each point belongs to.

It is, the case, however, that hypothetically calculating normals between points without yet knowing if they are surface might possibly be a step in an algorithm to figure out where surface boundaries are.

[Hasan Kaplan]

I think i caused a confusion. I want to calculate the value of the normal vector direction at each point of the point cloud data, i hope it is clearer for you

[Walter Roberson]

Normal directions are always relative to a vector (or plane), and that requires choosing at least two points: the point of interest and a point of origin. Isolated points do not have normals.