MATLAB Answers

I want to create random bumps on a flat surface

20 views (last 30 days)
Daniel Gray
Daniel Gray on 17 Jul 2017
Commented: Daniel Gray on 17 Jul 2017
I have a 300x300 zeros matrix and I would like to create random bumps on the surface on random heights. To be more detailed, imagine circles of ones on the surface, I would like to (rather than those) have bumps on the surface.
Almost like 3D Guassian bumps on the surface.
Any help would be appreciated.


Sign in to comment.

Accepted Answer

Grzegorz Knor
Grzegorz Knor on 17 Jul 2017
You can add Two-dimensional Gaussian functions with random amplitude at random location:
M = zeros(300,300); % initial matrix
N = 3; % number of bumps
sigma = 3;% std (width) of Gauss
maxAmplitude = 5; % maximum height
[x,y] = meshgrid(1:size(M,1),1:size(M,2));
for k=1:N
% random location of bumps
xc = randi(size(M,1));
yc = randi(size(M,2));
% Gauss function
exponent = ((x-xc).^2 + (y-yc).^2)./(2*sigma^2);
amplitude = rand()*maxAmplitude;
% add Gauss to the matrix M
M = M + amplitude*exp(-exponent);
shading interp

  1 Comment

Sign in to comment.

More Answers (0)

Sign in to answer this question.