How to rotate axis by 180 degree?

Question

CL 2022-9-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1809155-how-to-rotate-axis-by-180-degree

评论： CL 2022-9-21

By default, Matlab plots the my three unit vectors (x,y,z) in a way that the z-axis points up. How can I "roll" the orientation around the x-axis by 180 degrees so I can have the z-axis unit vector points down positively?

The right-hand rule has to be preserved - I'm not flipping any of the axis.

x=[1;0;0];
y=[0;1;0];
z=[0;0;1];
quiver3(0,0,0,x(1),x(2),x(3),'Color','green','LineWidth',2,'MaxHeadSize',0.5);
hold on;
quiver3(0,0,0,y(1),y(2),y(3),'Color','blue','LineWidth',2,'MaxHeadSize',0.5);
hold on;
quiver3(0,0,0,z(1),z(2),z(3),'Color','red','LineWidth',2,'MaxHeadSize',0.5);
axlims = norm(x)*1.2;
set(gca,'xlim',[-1,1]*axlims,'ylim',[-1,1]*axlims,'zlim',[-1,1]*axlims);
grid on;
axis square;

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Answer 1

Chunru 2022-9-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1809155-how-to-rotate-axis-by-180-degree#answer_1057650

在 MATLAB Online 中打开

x=[1;0;0];

y=[0;1;0];

z=[0;0;1];

quiver3(0,0,0,x(1),x(2),x(3),'Color','green','LineWidth',2,'MaxHeadSize',0.5);

hold on;

quiver3(0,0,0,y(1),y(2),y(3),'Color','blue','LineWidth',2,'MaxHeadSize',0.5);

hold on;

quiver3(0,0,0,z(1),z(2),z(3),'Color','red','LineWidth',2,'MaxHeadSize',0.5);

axlims = norm(x)*1.2;

set(gca,'xlim',[-1,1]*axlims,'ylim',[-1,1]*axlims,'zlim',[-1,1]*axlims);

grid on;

axis square;

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

set(gca, 'ZDir', 'reverse')

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CL 2022-9-21

Ah no - as shown in both images in the question, both orientations has to obey the right-hand-rule. Reversing the orientation would break the the right-hand orientation and direction of rotation. I should have specified it better.

CL 2022-9-21