MATLAB: RGB colors in scatter3

rgb scatter3

Im trying to plot n [X,Y,Z] dots in 3d with their colors given by C which is a nx3 matrix describing the RGB colors for each dot (graded colors)…. but its not working!!!!

scatter3(X,Y,Z,S,C, 'filled')

any suggestions?

Best Answer

Have a look at the example in the help:

         [x,y,z] = sphere(16);
         X = [x(:)*.5 x(:)*.75 x(:)];
         Y = [y(:)*.5 y(:)*.75 y(:)];
         Z = [z(:)*.5 z(:)*.75 z(:)];
         S = repmat([1 .75 .5]*10,numel(x),1);
         C = repmat([1 2 3],numel(x),1);
         scatter3(X(:),Y(:),Z(:),S(:),C(:),'filled')

Related Solutions

MATLAB: Getting colors using RGB values w/ scatter3

rgb triplets are normalized between 0:1

https://www.mathworks.com/help/matlab/ref/colorspec.html

To convert from decimal code, divide by 255.

[17,17,17]./255
% equals
[ 0.066667     0.066667     0.066667]

The color gray is

% RGP TRIPLE                           %CSS3 proposed standard name: https://www.w3.org/TR/css-color-3/
[0.5          0.5          0.5]        %gray
[0.82422      0.82422      0.82422]    %light gray
[0.75         0.75         0.75]       %silver
[ 0.66016      0.66016      0.66016]   %dark gray
[0.14844      0.14844      0.14844]    %mine shaft
[ 0.4375          0.5       0.5625]    %slate gray

See the rgb() function on the file exchange for RGB triplets to many different colors.

To apply that to scatter3; here's how to color all points gray and filled.

scatter3(x,y,z,[],[.5,.5,.5],'filled')

MATLAB: How to set retain the colors of SCATTER3 or a SURFACE plot after I plot a MESH over it in MATLAB 7.6 (R2008a)

To retain the original color values for scatter plot after overlaying a mesh plot, use the 'CLim' property of the axes by setting it to the 'CLim' values after the scatter plot was made.

As an example:

[x,y,z] = sphere(16);
X = [x(:)*.5 x(:)*.75 x(:)];
Y = [y(:)*.5 y(:)*.75 y(:)];
Z = [z(:)*.5 z(:)*.75 z(:)];
S = repmat([1 .75 .5]*10,prod(size(x)),1);
C = repmat([1 2 3],prod(size(x)),1);
hs = scatter3(X(:),Y(:),Z(:),S(:),C(:),'filled'), view(-60,60)
%Get the CLim values after plotting scatterplot
a = get(gca,'Clim')
hold on
[X,Y] = meshgrid(-1:.125:1);
Z = peaks(X,Y);
h1 = meshc(X,Y,Z);
axis([-3 3 -3 3 -10 5])
% Set the previous value of CLim as the Clim of axis
set(gca,'Clim',a);

Best Answer

Related Solutions

MATLAB: Getting colors using RGB values w/ scatter3

MATLAB: How to set retain the colors of SCATTER3 or a SURFACE plot after I plot a MESH over it in MATLAB 7.6 (R2008a)

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