Applet: Surfaces of constant $\phi$ in spherical coordinates
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The conical surface of $\phi=$ constant is shown, where the value of $\phi$ is determined by the blue point on the slider. Only the part of the surface where $\rho < 5$ is shown.
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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.