This should help those checking out models in fgviewer
To enable effects in fgviewer run it with:
fgviewer --prop /sim/rendering/shaders/quality-level -1
Also fix random buildings not showing up when model shader was set to 0 and generic was enabled.
Signed-off-by: Emilian Huminiuc <emilianh@gmail.com>
Incorporated changes to effects file syntax. Changed Till's landmass
to mix in the base terrain texture. Some shader cleanup.
Also, add a GUI control for enabling shaders.
