3D RGB plot in Matlab

Question

I have a 3-by-4 matrix in which each column has the 3 components R, G and B of a particular color. I need to plot each component in a 3D plot as a single point and, if possible, paint each of the points with the color of the RGB components that correspond to it.

I have tried with the plot3 function, but it paints a continuous line, and it has only one color.

For example, this is my matrix:

centroids = 

47    85   104   126   
37    66    86   103   
36    55    71    90

where (47,37,36) are the RGB coordinates of the first point, therefore I need to plot it as a single point in the RGB space and with this particular color. My idea was to have a for loop like this:

for i = 1:4
    plot3( centroids(1,i),centroids(2,i),centroids(3,i),'Color',centroids(:,i))
end

But it gives me an error, and it I do not try to change the color, it paints only a line and with the same color. Is there a way to plot each column of the matrix as an independent point and with the color of the RGB components?

Answer 1

You should use the scatter3 function instead. Here is a sample with your data, assuming it is contained in an array called A:

scatter3(A(1,:), A(2,:), A(3,:), 50, (A/255)', 'filled')

and the result:

Best,