Meshes are surfaces of any form created by defining the elevation of their characteristic points and interpolating between them.
In 3D, depending on the construction method chosen in the Info Box and Mesh Settings, you will obtain meshes created as a top surface only, meshes created with vertical sides (skirt) and meshes created as solid bodies.
You draw the main contours of the mesh projected to the Reference Plane. You can then raise the characteristic points of the mesh’s top surface out of this plane.
To aid in precise element placement, you can turn on the “Gravitate to Mesh” command to place additional elements onto the surface of the Mesh.