CODEWITHSUNDEEP
matlab
Carlos Navarro Astiasarán
Carlos Navarro Astiasarán

Reputation: 567

Plotting a cloud of points with a color gradient in MATLAB

I have a 3D matrix with values between 0 and 1.

The matrix goes from (1,1,1) to (k,k,k). For example, M(3,2,5) = 0.25.

I want to plot this matrix in a 3D graph as a cloud of points, where each point will be colored with a gradient from transparent (0) to black or other color (1).

I'm not sure if you can use alpha in matlab... if not, then 0 will be just white.

Upvotes: 1

Views: 644

Answers (1)

Some Guy
Some Guy

Reputation: 1797

You can use scatter3 with values from your matrix specifying the color of the point, and a white to black gradient would give you the same effect as transparency if the background is white. If you have a matrix M of size [k k k] To get the x,y,z for your points you can use ind2sub as follows:

>>[x,y,z] = ind2sub([k k k],1:numel(M));

And you can use scatter3 with this x,y,z as:

>>colors = [M(1:end)]'*[1 1 1]; % Get colors from black to white 
>>scatter3(x,y,z,36,colors);

Upvotes: 1

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