Sandbox From Contours tool introduction
Use the Sandbox From Contours tool to create a TIN from contour lines. You must create or import contour lines that are offset in their height prior to using this tool. Activate the Sandbox from Contours tool from the Draw menu.
Note: You must enable the Sandbox tools before you can use them. See Enabling the Sandbox tools for further information.
The following image shows several contour lines offset in height from the ground plane.
The following image shows the resulting terrain created when the Sandbox From Contours tool is used on the selected contours.
Tip: In some cases the Sandbox From Contour tool might create triangulations in the TIN that result in flat spots or plateaus. These plateaus can be retriangulated (to create a slope) using the Flip Edge tool.