This dialog is used when you enter the **New -> New Function Plot -> New 3D Surface Plot...** command. It allows for the creation of a new function of two variables. When the "Function" *Surface type *is selected the coordinate system will be Cartesian and the function will be of the form: z = f(x,y).

You may also define the X, Y and Z scales and the mesh parameters.

You can create parametric surfaces when the "Parametric" *Surface type *is selected. The only parameters allowed are latitude and longitude: `u`

and `v`

. Here, for example, is how you might plot a sphere having a radius equal to one:

As in the case for functions, you can supply the drawing domain for the two angular parameters and you can define the mesh parameters. The more rows/columns you request, the better the resolution of the output image will be. However, this is at the cost of a larger memory consumption and an increased time of computation. A slow CPU and small amounts of memory will be limiting.

Finally, you can provide information to the drawing routines about the rotational symmetry of the parametric surface using the two `Periodic`

check box options (one for each parameter).