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Krzysztof Rećko 98f4106694 Metaball tessellation optimization (Octree to BVH)

Speedup is non-linear, 2x-10x faster is quite normal.
Patch T43678.

- Switched from an Octree to BVH.
- Finding first points of surface no longer "wastes" density function evaluation: every result is cached.
- Use MemArena instead of using own memory management.
- Correct calculation of metaelem bounding box.
- Remove mball_count(): mballs are now counted "on the go".

2015-04-07 13:19:50 +10:00