Consider zoom when culling billboards.

screenScale represents the current zoom factor, but may need some
revision because I'm not sure if what it's doing is technically correct.
It is used to multiply the culling distance for cells, as well as the
fading distance.
Added comment.
Fix engine API copy/paste errors (typo).
Made the flipped y-axis on terrain import optional.

Pass a final boolean argument to TerrainBlock::import to control
y-axis flipping. It is enabled by default, since this was the previous
default behavior.

This should be added as an option in the terrain import dialog - see
game/tools/worldEditor/gui/guiTerrainImportGui.gui
Added a checkbox to the terrain import GUI and fixed a space.
Relocating the particles image directory out of art/shapes/particles to art/particles.  This should be a more logical and intuitive location.  Relevant managed particle related datablock save location defaults have been adjusted as well.
Merge pull request #278 from thecelloman/relocateparticles

Relocated the particles subdirectory to a more intuitive location.
Merge pull request #268 from eightyeight/terrain-import-flipped

Importing terrain heightmaps flips Y-axis
Terrain Macro Texture

Adds another layer of detail-like texture to the terrain and the
interface updates in the Terrain Painter.
Resolve issue #163

Fixed and assert on changing material, and we now map the material to the MATMGR by name instead of type.
Set the Ryder as the default starting weapon instead of the Lurker.
Resolve issue #193 - Gui Editor treeview now refreshes correctly when changed through a drag/drop operation.
Remove unused OOBSign from PlayGui
Merge pull request #283 from thecelloman/issue163

Resolve issue #163: Material Editor Crash- Opening the material editor with a mesh selected doesn't open a custom material.
Merge pull request #284 from thecelloman/ryderasdefault

Set the Ryder as the default starting weapon instead of the Lurker.
Merge pull request #285 from thecelloman/issue193

Resolve issue #193 - Gui Editor treeview now refreshes correctly...
Merge pull request #286 from thecelloman/removeOOBSign

Remove unused OOBSign from PlayGui
Moved teleporter related particle data out of the managed data file and into art/datablock/teleporter.cs.  I also corrected a bad filepath that would prevent mission loading.
Merge pull request #291 from thecelloman/movetpd

Moved teleporter related particle data out of the managed data file and ...
Removing the old TGE era "Buggy" vehicle.