Sometimes after DSM processing and meshing, the Triangulated Mesh surface will be facing the wrong way. That is, the object or surface will appear dark in the 3D Viewer when looking at the correct side and bright when looking at the incorrect side.
To flip all the normals so the surface
faces the correct direction, first select the Mesh in the 3D Viewer or Table,
and the pick the Flip Mesh tool 
on the Cloud/Mesh Tools Tab.