Applet: A three-dimensional rotating vector field
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This vector field is rotating around the $z$-axis. The speed of rotation decreases with $z$. You can rotate the graph with the mouse to give perspective. The vector field is $\dlvf(x,y,z)=(y/z,-x/z,0)$.
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General information about three.js applets
The applet was made using three.js and requires Javascript as well as a browser that supports WebGL. For most three.js applets, you can drag with the mouse to rotate the view, drag with the right button to pan, and zoom in/out with the mouse wheel. Many applets contain points that you can drag to change values of variables.