How to choose surface point in 3D plot

Hi,

I have a 3D plot for a function, and I want to mark surface point from this plot. I use matlab brush function to choose point. Unfortunately,use brush point will Include inside point. I have try if statement to filter points. But it dosen't work for cylinder model. Do anyone know anyway can only choose the surface point i want?

[Matt J]

What is an "inside point"? All points appear to be on the surface.

Perhaps if you zoom in and rotate the perspective you can isolate the point(s) that you are trying to brush more easily.

[Liu YungHsing]

Hi Matt,

Thank you for your answer! i have another plot for this data. As you can see from the left figure. Many points are not belong to surface point.

[Liu YungHsing]

Under an ideal state, i want to choose surface point from the figure.

[Liu YungHsing]

If i use brush to choose points, it would include some points not belong to surface point. So i want to ask is there any way can help me to choose only surface point.

Answer 1

[KSSV]

REad about delaunaytraingulation, once mesh is formed you can use patch or trisurf. If you could do fine, else attach your data.