Tes4Mod:Mod File Format/PGRD

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A PGRD record defines the path grid for a cell.

Subrecord	Type	Info
DATA	short	Number of nodes
PGRP	array	Node definitions. Each array entry is 16 bytes. X-coordinate (float) Y-coordinate (float) Z-coordinate (float) Flags (ubyte) Filler (3 bytes)
PGAG	?
PGRR	array	Node connections within the current cell. Each array entry is 4 bytes. Start node number (short) End node number (short)
PGRI	array	Node connections to other cells. Each array entry is 16 bytes. Local node number (long) X-coordinate of foreign node (float) Y-coordinate of foreign node (float) Z-coordinate of foreign node (float)
PGRL	struct	Linked path points. There is a PGRL subrecord for each linked object. Linked object form ID (formid) One or more node numbers (long) that are linked to the object