Coloured circles on a mesh

I managed to get two coloured boxes on the mesh

I am struggling to imagine how I could get the circles with three different colours on this mesh

Any suggestions are most welcome.

Answer 1

[Andrew]

Hi

Here is the code I used to get the coloured blocks. I get my data from a simulation I run on MicroCap12.

clear
clc
writerObj = VideoWriter('C:\Users\WINDOWS11\Documents\MATLAB\EExp100100','MPEG-4');%Name of video file
open(writerObj);
fig1 = figure(1);
load EExp100100.TNO %Read in the file generated by Microcap 12 -No headers
d1 = EExp100100;
timestamp = d1(:,1);
d1(:,1)=[];%Remove time 
rws=100; %Get this number from the Microcap 12 netlist
cols=100; %Get this number from the Microcap 12 netlist
s=size(d1);
d1ct=1;
%I use the same block coordinates I used to set up the MicroCap12 simulation
ind1a = (20:80);
ind1b = (1:40);
Z(ind1a,ind1b) = 0;
ind2a = (20:80);
ind2b = (60:100);
Z(ind2a,ind2b) = 0;


for k = 1:s(1)
    
    for j=1:rws
        
        for i=1:cols
            Z(j,i)=d1(k,d1ct);
            d1ct=d1ct+1;
        end
        
    end
    d1ct=1;
    
    x=1:1:rws;
    xx=1:1:rws;%put in an increment for spline command
    for p=1:cols
        y=Z(:,p);
        yy(:,p)=spline(x,y,xx);
    end
    
    syy=size(yy);
    
    x=1:1:cols;
    xx=1:1:cols; %put in an increment for spline command
    for p=1:syy(1)
        y=yy(p,:);
        Zz(p,:)=spline(x,y,xx);
    end
    
    %s2=size(Zz);
    %mztb=zeros(1,s2(2)+2);
    %sidez=zeros(s2(1),1);
    %Zc=[mztb;sidez Zz sidez;mztb];%put some 0's around the data
    
    %[X,Y] = meshgrid(1:1:s2(2)+2, 1:1:s2(1)+2);
    [X,Y] = meshgrid(1:1:100, 1:1:100);
    %mesh(X,Y,Zc);
    mesh(X,Y,Zz)
    colormap(bone)
    %colormap(sky)
    view([-50 70])
    title('100 by 100 grid (spline = 1)')
    xlabel('X')
    ylabel('Y')
    txt = ['Time: ' num2str(timestamp(k,1)) ' secs'];
    text(-15,-5,txt)
    %axis([1 s2(2)+2 1 s2(1)+2 -2 2])
    axis([1 100 1 100 -2 2])
    hold on
    m1 = mesh(X(ind1a,ind1b),Y(ind1a,ind1b),Z(ind1a,ind1b));
    set(m1,'Facecolor','r');
    m2 = mesh(X(ind2a,ind2b),Y(ind2a,ind2b),Z(ind2a,ind2b));
    set(m2,'Facecolor','r');
    view(-50,70)
    hold off 
    
    F=getframe(fig1);
    %write the current frame to the writer object
    writeVideo(writerObj,F)
end

%Close the writer object. File appers in current folder
close(writerObj);
disp('Video File Written')

Answer 2

[Benjamin Kraus]

What approach did you use to draw the rectangles?

The easiest approach to drawing circles in MATLAB is using the rectangle command and setting the Curvature to 1. This can only be used to draw circles in the X/Y plane, which looks (from your picture) like what you are trying to do.

rectangle('Position',[0 0 1 1],'Curvature',1,'FaceColor','green')
view(3)
grid on
box on

If you need circles in another plane, you have two options:

Option 1a: Use an hgtransform to rotate your circle to the correct plane.

figure
h = hgtransform('Matrix',makehgtform('xrotate',pi/2));
rectangle(h,'Position',[0 0 1 1],'Curvature',1,'FaceColor','green')
view(3)
grid on
box on

●

Option 1b: You can also use an hgtransform to translate your circle if you need it somewhere other than at Z=0.

figure
h = hgtransform('Matrix',makehgtform('translate',[0 0 1]));
rectangle(h,'Position',[0 0 1 1],'Curvature',1,'FaceColor','green')
view(3)
grid on
box on

Option 2: Use a patch (the patch or fill3 commands) to draw your circle in an arbitrary dimension.

figure
t = linspace(0,2*pi,361);
x = zeros(size(t));
y = cos(t);
z = sin(t);
fill3(x,y,z,'g')
view(3)