Split MT_PROBAB_VOXELMAP into Free List and Occupied List

[MoBaT]

Hey,

I'm using the class gpu_voxels::voxelmap::ProbVoxelMap to insertSensorData from my PointCloud struct. I was wondering if there was a way to separate the voxels which were considered Occupied and the ones which were Free list which consists of all the the voxels that the raycasting function hit.

So there would be 3 lists:

1. Occupied Voxel List (Passes a certain threshold)
2. Raycast Voxels Hit (All the voxels the raycast function hit to clear the occupancy / reset voxel)
3. Free space which the voxels were never touched by the function (the empty space).

Thanks!