From Mod Wiki
- gravity value for the level.
- Suggested value: 8192. Dmap always splits the BSP tree along the planes X=_blocksize*n and Y=_blocksize*n. Default _blocksize value is 1024. Increase the blocksize using larger powers of 2 to reduce compile times on very large maps with a low structural brush density.
- The collective starts to falloff beyond this height.
- The effect of the collective is zero at this height.