improving path quality on tiled meshes: multiple issues

in the old code, when a new polygon is found a single 3D position is associated with it. This position is used even when arriving at the tile from a different side (at which point the opint is far).
The new code allows multiple nodes for border polygons based on entrance side.
Any reason that this is not using the leftover bits, so that it is 27? Would raise the number of indices from 16 mil to 135 mil. I don't think that there are any instructions that read 3 bytes to make this faster.