How to implement gradient fill based on Waterfall command?

Question

Pengkun Shi 2022-10-19

编辑： Walter Roberson 2023-8-30

Use the Waterfall command to draw a picture as shown in the following figure:

[X,Y] = meshgrid(-3:.125:3);
Z = peaks(X,Y);
C = gradient(Z);
waterfall(X,Y,Z,C)
colorbar

How can I write code to achieve gradient filling, so that the above figure has the rendering effect of the following figure?

Thanks a lot.

Answer 1

Saffan 2023-8-30

Hi,

To accomplish this, you can use the “surf” method as shown in the following code snippet:

[X, Y] = meshgrid(-3:.125:3);

Z = peaks(X, Y);

% Calculate gradient

[dx, dy] = gradient(Z);

gradientMagnitude = sqrt(dx.^2 + dy.^2);

% Plot using surf

surf(X, Y, Z, gradientMagnitude, 'EdgeColor', 'none');

colormap('jet');

colorbar;

The “gradientMagnitude” is used as the color data for the surface, resulting in a gradient filling effect.

Refer to this for more information: