Terrain Driver difference between osgearth 2.1 and 3.2

[steve...@gmail.com]

Hoping someone can assist.

I'm using an app that uses an osg earth file. Originally, the app was based on 2.1, but has been upgraded to 3.2. 

The issue is that the original terrain driver called the "MP" plugin, which apparently is not supported in 3.2

Is there a different method in 3.2 to specify the terrain driver to be used?

Thanks in advance!