Using Grid Planes

3D graph analysis can sometimes be a little bit difficult. One trick that can help in analysis is to add a grid plane to your equation.

A grid plane is nothing more than an equation graphed in wireframe mode. For instance, if z1 is an equation that bounces around between -1 and 1 (probably a trig function), you might want to put a grid plane around 0.8 to clearly see the peeks.

To make a grid plane, set another equation, say z2, to the hard coded z-value at which you'd like the plane. So in our example, z2 would be "0.8". Then just change the render mode of z2 to wireframe.