MATLAB: 3D point cloud labeling, (Annotation on a particular x,y,z coordinate)

3d point cloudannotation;

I wanted to label a 3D point cloud based on its features by attaching a number or an alphabet. i have located my ROI but I need to label it.

According to the documentation of text you can insert a text at a 3D position.

Sounds like you want to use the text command.

For example:

[X,Y] = meshgrid(-pi:pi/16:pi);
Z = cos(X).*sin(Y);
surf(X,Y,Z)
text(X(26,17),Y(26,17),Z(26,17)+0.1,'Peak')

Use the plot function.