DESCRIPTION:

When Eccet calls a script due to a mouse click/move or a
keypress, it will fill in the root.global.pointer struct
to contain data about the position of the pointer at that
time. It contains several substructures listen in "SEE ALSO"
describing the pointed-to voxel, pixel and the mouse state.
Moreover it defines the variables coord and midcoord that
refer to the world coordinates of the pointed to voxel.
coord and midcoord contain -1 in the .x component, if no
3D coordinate could be fixed (no voxel pointed to).
They differ in where exectly they point to. coord points to
the upper left corner of the voxel pointed to, midcoord
points to the middle of the voxel.