Sets the thickness of the point entity (DXF 39) in drawing units. Thickness is the extrusion length along the normal. A positive value extrudes along the normal. A negative value extrudes opposite from the normal. A zero value defines a trace without thickness. The initial value is zero by default. 

Example of Working with the Point Object 

Specific Point Properties 

OdDbPoint::thickness() method

OdDbPoint Methods