The surface I'm plotting comes out jagged and "saw teeth" like

the surface I plot, using Surf command comes out pointy and jagged, and it ruines the visual presentation and creates an illution the data is spoiled.

I checked the points via contour and saw that the data is fine - the outpoot is smooth and there are no NaN values.

I also tried trisurf function.

Is there a solution? Or is it just a bug I have to deal with?

the good side:

the bad side:

thank you very much!

[Mathieu NOE]

hello

can you pls provide the code and data ?

[Star Strider]

I am not certain what the problem is.

One option would be to interpolate the matrices to finer grids (or at least different grids, depending on what the problem is), and using an interpolation method other than 'linear'. MATLAB has several matrix interpolation functions that could make this straightforward.

[boaz]

Hey,

thanks for answering, here are the attached data files, and relevant code lines.

The Code:

%% calculating the color map
C_h = surface_color(h, "abyss");
C_h = reshape(C_h,[m,n,3]);

%% main plot - surface
subplot(4,4,[1 2 5 6 9 10 13 14]) %plot h
cla
grid on

S = surf(X,Y,h,C_h);
S.EdgeColor = 'none';
shading interp   
lighting gouraud 

Answer 1

[Matt J]

It's a very coarsely sampled surface. There's not really any more to it. You can bicubicly upsample the data if you want a smoother appearance:

load stuff

figure;
S = surf(x,y,h,'EdgeAlpha',0.3);  
view(-84,84)

●

figure;

H=interp2(h,3,'bicubic') ;
X=linspace(x(1), x(end),width(H));
Y=linspace(y(1), y(end),height(H));
surf(X,Y,H,'EdgeAlpha',0.3)
view(-84,84)

[boaz]

Thanks :)

I delibiratly gave a coarse sample so the problem would be more visible. It also happens with finer mash.

I guess it is a matter of the order that matlab draws the lines between data points.

Even when using interpolation, there are "pointy" edges in the surface, even though much less prominent.

[Matt J]

Show us. With bicubic interpolation, that should be possible only if the data is piecewise linear over a broad swath of samples in the region of the pointy edge.