Note #18
There's been some debate within the team about vegetation and how to get it looking better at medium ranges. We have some fantastic high poly vegetation that can only be rendered at close range and thankfully the Leadwerks Engine offers automatic vegetation billboard creation (low-poly distance trees). Unfortunately it renders the vegetation billboards without shading, that is without any kind of lighting or shadowing. The result is a flat face with a flat texture. It contrasts heavily with the high poly 3d models creating a heavy LOD pop when switching between the two. These flat billboards also create a flat looking scene.
The initial attempt to rectify this contrast (flat vs shaded) was to render the high poly trees to texture and create low poly statically lit 3d models.

These low poly models render extremely quickly and can render shadows onto the ground but they appear jagged at anything other than far range.
The answer to the issue appears to be a hybrid of pre-rendered/lit trees combined with the billboarding system.

As you can see in the middle row the trees without shadows are 2 poly billboards and the trees with shadows are several thousand poly 3D trees being rendered with shadows and highlights. The billboards blend in quite well with the 3d.
Cheers