How to rotate 3D matrix?
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I have 3 matrices for surf commands: X, Y, Z. I transformed the matrix so that the surface rotates -45 degrees around the OY axis. But now my current code can make it rotate -45 degrees, but it deviates A (one edge of the surface)form a certain distance. Can someone help me improve my code to make the surface rotate with A as the axis?thank you very much!.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/614140/image.png)
My code is below:
a=-45;
R=[cosd(a) sind(a);-sind(a) cosd(a)];
V=R*[X(:),Z(:)]';
X1=reshape(V(1,:),size(X));
Z1=reshape(V(2,:),size(Z));
surf(X1,Y,Z1);
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J. Alex Lee
2021 年 5 月 11 日
it looks like your segment A is parallel to the axis OA (trivial in y-direction), in which case it should be easy to first translate such that A and OA coincide...then do your rotation, then untranslate to put A back where it belongs.
depending on what you need, this might be useful (disclaimer i have not used hgtransform before):
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