Screen picture of X-Y graph with initial charge distribution. Screen picture of X-Y graph with modified charge distribution . VRML example of x-y graph . This example illustrates a universal VRML widget for 2D function plots. These are widely used to show functions of two variables.
Familiar examples are topological maps and temperature regions on a weather map.
This example shows the electric potential due to charges in a plane. The position of the charges may be changed by the user by dragging with a mouse. Positive potentials are shown in red. Negative potentials are shown in blue. The value of the potential at any point is shown in the status line.