Rotate 3D quiver
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Seereen
el 6 de Sept. de 2019
Comentada: Bjorn Gustavsson
el 11 de Sept. de 2019
I am trying to plot 3D vectors of the scene using quiver 3 function, The output upsidedown!
I reverse all the axis X,Y and Z ... I try to reverse each one separately
I could not get what I really want .. I want it as we see it in the reality
as you see in the image ... the wall and floor not adjust correctly!
How can I make them in the correct position?
I am including the function that I am used to getting this plot
%---------------------3D VECTOR FLOW -------------------------%
function Display_3D_flow(Z,U,V,W,sample,scale,title_stg,...
filename,ymin,ymax,zmin,zmax,xmin,xmax)
pic_x=size(Z,1);
pic_y=size(Z,2);
U=U*scale;
V=V*scale;
W=W*scale;
rx=pic_x:-sample:1;
%rx=1:sample:pic_x;
ry=1:sample:pic_y;
littleU=U(rx,ry);
littleV=V(rx,ry);
littleW=W(rx,ry);
NO_AUTOMATIC_SCALING=0;
[littleX,littleY] = meshgrid(ry,rx);
littleZ=Z(rx,ry);
figure
quiver3(littleX,littleY,littleZ,littleU,littleV,littleW,NO_AUTOMATIC_SCALING);
%view([90,90,-180])
axis([xmin xmax ymin ymax zmin zmax])
title(title_stg)
xlabel('X-axis')
ylabel('Y-axis')
zlabel('Z-axis')
hold on
%set(gca,'YDir','Reverse')
set(gca,'ZDir','Reverse')
%set(gca,'XDir','Reverse')
hold off
jpg_filename=[filename,'.jpg'];
print('-djpeg',jpg_filename)
end
5 comentarios
Bjorn Gustavsson
el 10 de Sept. de 2019
The only thing we others can say for sure is that your "wall" and "floor" labels are in unusual positions. If you change those two around then it would be fine for us. Otherwise you have done some mix-up with what coordinates you put in the x-y-z and vx-vy-vz variables. Your quiver3-call is "correct" for the x-y-z-vx-vy-vz variables you call it with. If you skip the set(gca,'ZDir','Reverse') call you will get z increasing upwards. After that you might have to figure out what your variables actually represent.
HTH
Respuesta aceptada
Seereen
el 10 de Sept. de 2019
Editada: Seereen
el 10 de Sept. de 2019
3 comentarios
Bjorn Gustavsson
el 11 de Sept. de 2019
Have a manual look at a couple of components of your [X,Y,Z] (your positions) and your motion components [U,V,W] - preferably some you have at least a hunch about what they should be. For example something like this:
[X(1,1),Y(1,1),Z(1,1)] % should give you the position of the first point
[U(1,1),V(1,1),W(1,1)] % The corresponding motion-vector.
Then you can repeat that for littleX, littleY, and littleZ etc. Just to trace where things go strange...
HTH
Más respuestas (2)
Bjorn Gustavsson
el 10 de Sept. de 2019
Matlab uses right-handed coordinate systems (sensible), with the default convention that z is in the upward vertical direction in 3-D plots. My guess is that you've either goofed (very very unlikely, but "I know you as I know myself") with the wall-floor labling, or you've used a different notation for your x-y-z coordinates? The rest looks OK.
Bruno Luong
el 11 de Sept. de 2019
Editada: Bruno Luong
el 11 de Sept. de 2019
Another alternative: instead of reordering your data/plot parameters, you can change the view.
Play on camera parameters, especially important in your case is CameraUpVector
s=5*peaks;
ax = subplot(1,2,1);
surf(ax,s);
axis equal
ax = subplot(1,2,2);
surf(ax,s);
set(ax,'CameraUpVector',[0 -1 0]);
axis equal
Note: some interactive tool such as rotate3d won't work well with CameraUpVector different than default value of [0 0 1];
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