How can i plot multiple objects in same 3D space i.e. plot3 ?

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RANJITH NAIK
RANJITH NAIK 2021-4-6
编辑： Matt J 2021-4-6
I need to visualize multiple objects i.e. 2D circle and 2D ellipse in same 3d space (plot3)..
i have shared codes of both cirle and ellipse .. please guide me.
%CODE FOR 2D CIRCLE IN 3D SPACE
center = [0.5 0 0.4]; %[x y z]
radius = 0.1;
dt = 0.25;
t = (0:dt:10)';
theta = t*(2*pi/t(end))-(pi/2);
points = center + radius*[0*ones(size(theta)) cos(theta) sin(theta)];
hold on;
plot3(points(:,1),points(:,2),points(:,3),'-*w', 'LineWidth', 0.002);
xlabel('x');
ylabel('y');
zlabel('z');
axis auto;
view([60,10]);
grid('minor');
%CODE FOR 2D ELLIPSE IN 3D SPACE
gtobj=ellipticalFit.groundtruth([], [0,0],[0.075,0.15]/2,90); %Define the ellipe in 2D
xy=gtobj.sample(0:20:360); %Define waypoint coordinates
axis auto;
view([-41,-33])
hEllipse=plot(gtobj,{'Color','g'}); %Make plot in xy plane first
hold on
hWayPts=scatter(xy{:},'filled','k','SizeData',50);
hold off
xlabel 'X', ylabel 'Y', zlabel 'Z'
T=makehgtform('translate',[0.4,0,0.4],'yrotate',pi/2); %rototranslate the plot out of xy plane
set([hEllipse,hWayPts],'Parent',hgtransform('Matrix',T))

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回答（2 个）

DGM
DGM 2021-4-6
Something like this?
center = [0.5 0 0.4]; %[x y z]
radius = 0.1;
dt = 0.25;
t = (0:dt:10)';
theta = t*(2*pi/t(end))-(pi/2);
points = center + radius*[0*ones(size(theta)) cos(theta) sin(theta)];
hold on;
plot3(points(:,1),points(:,2),points(:,3),'-*r', 'LineWidth', 0.002);
% what is this?
% gtobj=ellipticalFit.groundtruth([], [0,0],[0.075,0.15]/2,90);
% since i can't plot something i don't have, i'll just plot another circle
center = [0.5 0 0.4]; %[x y z]
radius = 0.08;
dt = 0.25;
t = (0:dt:10)';
theta = t*(2*pi/t(end))-(pi/2);
points = center + radius*[cos(theta) 0*ones(size(theta)) sin(theta)];
plot3(points(:,1),points(:,2),points(:,3),'-*b', 'LineWidth', 0.002);
% wait until the plots are done to add the labels and stuff
xlabel('x');
ylabel('y');
zlabel('z');
axis equal
view([60,10]);
grid('minor');
I have no idea what ellipticalFit.groundtruth is, I can't demonstrate it.
Matt J
Matt J 2021-4-6
编辑：Matt J 2021-4-6
Ran in:
Using hold on and hold off, you can add anything you want to a pre-existing 3D axis, even the results of a 2D plotting command. The result of a 2D plotting command will be placed in the xy-plane. (Note that some plotting commands like line() or surface() will add to an existing axis without the need to issue hold.)
Once you have added a 2D plot to a 3D axis, you can re-orient it arbitrarily in 3D space using hgtransform. So for example, your 3D circle could also have been generated using the 2D plot() command as follows:
center = [0.5 0 0.4]; %[x y z]
radius = 0.1;
dt = 0.25;
t = (0:dt:10)';
theta = t*(2*pi/t(end))-(pi/2);
xlabel('x');
ylabel('y');
zlabel('z');
axis auto;
view([60,10]);
grid('minor');
hold on
T=makehgtform('translate',center,'yrotate',pi/2);
plot(radius*cos(theta),radius*sin(theta),'-*r', 'Parent', hgtransform('Matrix',T))
hold off
I should caution you that hgtransform has shown some quirky behavior in R2020b as discussed in this thread,
https://www.mathworks.com/matlabcentral/answers/769387-understanding-implicit-surface-plot-behavior?s_tid=srchtitle
Basically though, as long as you do not modify the axes limits after the hgtransform is created, you should be fine.
  1 个评论
Matt J
Matt J 2021-4-6
编辑：Matt J 2021-4-6
Ran in:
For an ellipse, it's the same kind of thing,
hold on
axis vis3d;
T=makehgtform('translate',center,'yrotate',pi/2);
plot(2*radius*cos(theta),radius*sin(theta),'-*r', 'Parent', hgtransform('Matrix',T))
hold off

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