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Terraformer Expedition to Mars Update 3/28/15

- This update is mostly a graphics update

- We've added quad trees for more detailed terrain.

- We've improved performance by improving the polygon and vertex filters

- We've changed the lighting/shading model, fixing shading issues while under ground

- We've changed the bump mapping, bump mapping is now implemented correctly when underground.

- We've fixed edge blending,
- There were cases when hard edges were used when a smooth edge would be desirable.
- There were cases when blends were not depth biased correctly.

- Added new distance fading

- Added a new adaptive vertex distance filter

- Fixed world wrapping normal vector issue(s).

- Fixed jump bug

- Added number of iron veins left to melt/remove, in order to get core rotating, to the planet magnetic field achievement.