How to rotating a stl object
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TOM SALIC
am 18 Sep. 2022
Kommentiert: TOM SALIC
am 19 Sep. 2022
Hi everyone,
I know this question has already been asked but here I am trying to spin the rotor of a wind turbine. I have the stl file and I applied the rotation matrix but the object is rotating but also in translation. My objective is simply to make it turn on the spot. Thanks for your advices.
[p,t,tnorm]=import_stl_fast('Rotor.stl',1,2);
TR=triangulation(t,p);
%trimesh(TR)
ax=linspace(0,2*pi,10);
az=pi/4;
ay=pi/4;
Ry=[cos(ay) 0 sin(ay); 0 1 0; -sin(ay) 0 cos(ay)];
Rz=[cos(az) -sin(az) 0; sin(az) cos(az) 0; 0 0 1];
filename='test.gif';
figure;
h1=trisurf(t,p(:,1),p(:,2),p(:,3), ...
'FaceColor','black','EdgeColor','none','LineWidth',0.25);
for idx=1:length(ax)
Rx=[ 1 0 0; 0 cos(idx) -sin(idx); 0 sin(idx) cos(idx)];
PointR=p*Rx;
h1=trisurf(t,PointR(:,1),PointR(:,2),PointR(:,3), ...
'FaceColor','black','EdgeColor','none','LineWidth',0.25);
%view(90,0)
frame = getframe(1);
im = frame2im(frame);
[imind,cm] = rgb2ind(im,256);
if idx == 1
imwrite(imind,cm,filename,'gif', 'Loopcount',inf);
else
imwrite(imind,cm,filename,'gif','WriteMode','append');
end
pause(0.1)
end
I have attached the stl file
4 Kommentare
Jan
am 18 Sep. 2022
If you explain, what "doesn't work" means, it is possible to help you. Do you get an error message? Does the result differ from your expectations?
Akzeptierte Antwort
Fabio Freschi
am 19 Sep. 2022
You shoud translate the points p before the rotation and then move them back
If R is your rotation matrix and the center of rotation is C = [0 Cy, Cz] (Cy and Cz identify the center of the turbine rotor)
PointR = (p-C)*R+C
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