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How to make patch cylinder wheels for this semi truck?

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Quincey Jones
Quincey Jones on 23 Mar 2020
Commented: Quincey Jones on 24 Mar 2020
figure
view(3)
grid on
%lorry
vertices_lorry = [0 1 0.5 ; 4 1 0.5; 6.5 1 0.5; 6.5 1 1.2; 6 1 1.3;...
5 1 1.8; 4 1 1.8; 4 1 2; 0 1 2; ... % postive y of lorry
0 -1 0.5; 4 -1 0.5; 6.5 -1 0.5; 6.5 -1 1.2; 6 -1 1.3;...
5 -1 1.8; 4 -1 1.8; 4 -1 2; 0 -1 2]; % negative y of lorry
faces_lorry_cargo = [10 1 9 18; 1 2 8 9; 8 9 18 17; 10 11 17 18; 7 8 17 16;...
1 2 11 10];
faces_lorry_driver = [7 6 15 16 16 16; 5 6 15 14 14 14; 5 4 13 14 14 14;...
3 4 13 12 12 12; 2 3 4 5 6 7; 11 12 13 14 15 16; 2 3 12 11 11 11];
patch('Faces',faces_lorry_cargo,'Vertices',vertices_lorry,'FaceColor','#86DA7D','EdgeColor','k');
patch('Faces',faces_lorry_driver,'Vertices',vertices_lorry,'FaceColor','#868686','EdgeColor','k');
I am trying to build a truck in Matlab but I cannot figure out how to place 4 different half cylinder "wheels" on the bottom. How can I do this?
The wheels should go around 180 deg from the bottom. the rear wheel is centered 1m from the back and the wheel base is 3.95. the wheels are 0.2m thick.

Accepted Answer

darova
darova on 23 Mar 2020
Try this
t = linspace(0,2*pi,20)';
[x,y] = pol2cart(t,1); % create data for circle
v0 = x*0;
X = [v0 x x v0];
Z = [v0 y y v0];
Y = [v0-1 v0-1 v0+1 v0+1]*1.2;
hold on
surf(X,Y,Z,'facecolor','y') % draw wheel
surf(X+4,Y,Z,'facecolor','y') % draw wheel +4 position
hold off
axis vis3d
Experiment

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