Mesh deformer is a standard deformator that deform geometry over a polygon mesh with associated UVW TAG.
This deformer can deform on triangles and quadrangles mesh.

UV Object is the Polygon Object that need a UVTAG associated.
U and V coordinate field is the position of object on the mesh.
Swap the UV coordinate to change the orientation of object.
Scale (x,y,z) is the manual scale of the deformed object.
Master scale is the proportional scale of object.
Normal Offset is the offset about normal of mesh.
No Deformation can place the object on a mesh without deformation and scale. The up-vector set the orientation to align the object on the mesh.

The MeshDeformer AXIS is the reference for deformation.