How can I define a non-uniform pressure distribution in Settle3D?

You can use the general polygonal load or rectangular load to define the load geometry.  The load magnitude will be variable (non-uniform).  To define a load magnitude which varies over the area of the polygon, select the Variable checkbox and select the Define button.  You will see a dialog which allows you to define the load magnitude at each vertex of the polygon.

The Fill load, which is defined in the same way as a polygonal load, can also be defined as variable. 


Define Load dialog



Define Load on Each Vertex for a non-uniform pressure distribution