Work with the mapPt instead the PtList?

[Pat-I]

Maybe it would be better to work with the map points for the height calculation.

For each frame go through all pts only once and make a list (or array) of all points in a 50m(or other) radius.
Then use this list to:

1. Calculate the blade height
2. Apply the cut/fill height precisely to each pt
3. draw a nicer look ahead

Con: Maybe some rounding error because we use a second list but should be negligible

[Pat-I]

Best way would probably to use PtList for height calc and then go once though mapPt.