MATLAB: How to add colour to the faces of a patched shape

angular shapescolourpatchsurface

figure(1)

v = [0 -20 60; 0 -20 56; 50 -10 60; 50 -10 56; 55 0 60; 55 0 56; -55 0 60; -55 0 56; -50 -10 60; -50 -10 56];

f = [1 2 4 3; 3 4 6 5; 5 6 8 7; 7 8 10 9; 1 2 10 9];

patch('Faces',f,'Vertices',v,'FaceAlpha',0);

I have this shape which is a simplified wing, how can I adapt the patch function to colour the faces?

Best Answer

Hello Jacob Cialou-Clark:

as you specify a 3D faced object you have to take care which vertices you connect to faces. Right now, you define the mantle which cannot be seen directly from 2D plot via patch(). Another problem is that 'FaceAlpha',0 represents completely transparent faces.

In order to change that and have all faces of your 3D wing in 'red' you can change your code to:

 fh = figure(1);
 ah = axes('Parent',fh);

 v = [0 -20 60; 0 -20 56; 50 -10 60; 50 -10 56; 55 0 60; 55 0 56; -55 0 60; -55 0 56; -50 -10 60; -50 -10 56];
 f = [1 2 4 3 1; 3 4 6 5 3; 5 6 8 7 5; 7 8 10 9 7; 1 2 10 9 1; 1 3 5 7 9; 2 4 6 8 10];

 patch(ah,'Faces',f,'Vertices',v,'FaceAlpha',1,'FaceColor','red');
 ah.View = [45 45];

Kind regards,

Robert

Related Solutions

MATLAB: How to make an animation of changing dimension rectangle in Matlab

clc;
x=[-50 -50 50 50 -50];
y=[-50 50 50 -50 -50];
plot(x,y,'black');
axis([-60 60 -60 60]);
hold on;
x=[-25 -25 25 25 -25];
y=[-12.5 12.5 12.5 -12.5 -12.5];
p = patch('XData',x,'YData',y,'FaceColor','white');
pt2 = [1 1 1];
time_instants = 250;
for i=1:1:1000
    % right to left
    right_max = 50 - max(x);
    left_max = -50 - min(x);
    for t=linspace(right_max, left_max, time_instants)
        p.Vertices(:,1) = x' + t;
        drawnow
    end
    pt2=pt2+[-0.125 0.125 0];
    x = x*pt2(1);
    y = y*pt2(2);
    p.Vertices(:,2) = y;
    
    % left to right
    right_max = 50 - max(x);
    left_max = -50 - min(x);
    for t=linspace(left_max, right_max, time_instants)
        p.Vertices(:,1) = x' + t;
        drawnow
    end
    pt2=pt2+[-0.125 0.125 0];
    x = x*pt2(1);
    y = y*pt2(2);
    p.Vertices(:,2) = y;
end

MATLAB: Transparent and Multi-Color 3D-Surfaces

This is a guess since I cannot run your code.

See if decreasing the 'EdgeAlpha' property (especially in a mesh plot) helps.

Best Answer

Related Solutions

MATLAB: How to make an animation of changing dimension rectangle in Matlab

MATLAB: Transparent and Multi-Color 3D-Surfaces

Related Question