Raytracing PCD as Implicit Surface

Implicit surface: higher quality than disk render, more accurate surface silhouettes.
Raytracing at interactive rates (video sped up)

3 clips:
1) No octree
2) In octree, radius 0.1: takes 60% time, very small speedup (compared to disk) since smooth surface requires more points. A denser model will benefit more from octree.
3) Radius 0.05: 36% time of 0.1 radius is a significant speedup. Smaller radius has less octree artifact due to less overlap, but less points mean it is statistically less stable as shown by the noise around ears.

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