extrude

Boolean value. Specifies whether to connect the Polygon to the ground. To extrude a Polygon, the altitude mode must be either AltitudeMode.relativeToGround, AltitudeMode.relativeToSeaFloor, or AltitudeMode.absolute. Only the vertices are extruded, not the geometry itself (for example, a rectangle turns into a box with five faces). The vertices of the Polygon are extruded toward the center of the Earth's sphere.