SMBX NPC Offsets

This is the memory map for the npc struct. This struct is not fully analysed. Any help is appreciated! Please note that the data may not be fully 100% accurate.

NPC Memory
Name	Memory address	Memory type	Description
Attached layer name	NPC+0x00	VB6 String Pointer	The attached layer name.
Unknown	NPC+0x04	Word	Unknown
Unknown decrementing timer	NPC+0x06	Word	Unknown decrementing timer
Collides below	NPC+0x0A	Word	Set to 2 when touching a block below
Collides left	NPC+0x0C	Word	Set to 2 when touching a block to the left
Collides above	NPC+0x0E	Word	Set to 2 when touching a block above
Collides right	NPC+0x10	Word	Set to 2 when touching a block to the right
Unknown	NPC+0x18	Float	NPC x-axis movement related, perhaps temporary
Hit Counter (ie for hammers)	NPC+0x26	Word	Hit counter, for point calculation
Invincibility to Sword	NPC+0x26	Word	Invincibility frame countdown, for sword attacks
Activate event layer name	NPC+0x2C	VB6 String Pointer	Activate event layer name
Death event layer name	NPC+0x30	VB6 String Pointer	Death event layer name
Talk event name?	NPC+0x34	VB6 String Pointer	Talk event name?
No More Objs event layer name	NPC+0x38	VB6 String Pointer	No More Objs event layer name
Layer name	NPC+0x3C	VB6 String Pointer	Layer name
Unknown	NPC+0x40	Word	Unknown (some sort of hide value if -1)
Activated	NPC+0x44	Word	Activated / interacted with player flag
Friendly	NPC+0x46	Word	Friendly (on = 0xFFFF)
Don't Move	NPC+0x48	Word	Don't Move (on = 0xFFFF)
NPC Message text	NPC+0x4C	VB6 String Pointer	NPC Message text
Is a generator	NPC+0x64	Word	Is a generator?
Generator delay setting	NPC+0x68	Float	Generator delay setting
Generator firing rate	NPC+0x6A	Word	Generator firing rate
Generator delay countdown	NPC+0x6C	Float	Generator delay countdown
Direction to generate NPC?	NPC+0x70	Word	Direction to generate NPC?
Layer to spawn NPC on	NPC+0x72	Word	Which layer to spawn NPC on
Invalidity/offscreen flag?	NPC+0x74	Word	Invalidity or offscreen flag?
X position	NPC+0x78	Double	X position
Y position	NPC+0x80	Double	Y position
Height	NPC+0x88	Double	Height
Width	NPC+0x90	Double	Width
X Speed	NPC+0x98	Double	X Speed
Y Speed	NPC+0xA0	Double	Y Speed
Spawn X	NPC+0xA8	Double	Spawn X
Spawn Y	NPC+0xB0	Double	Spawn Y
GFX Height	NPC+0xB8	Double	GFX Height
GFX Width	NPC+0xC0	Double	GFX Width
Unknown	NPC+0xD8	Float	Unknown
Respawn Id	NPC+0xDC	Word	Respawn Identity. 0 means doesn't respawn, otherwise same as 0xE2
Id	NPC+0xE2	Word	Sprite GFX index/Identity
Animation frame	NPC+0xE4	Word	Animation frame
Animation timer	NPC+0xE8	Float	Animation timer
Direction faced	NPC+0xEC	Float	Direction faced (Unknown difference from 0x118)
NPC AI 1	NPC+0xF0	Double	Multipurpose NPC AI state/timer 1
NPC AI 2	NPC+0xF8	Double	Multipurpose NPC AI state/timer 2
NPC AI 3	NPC+0x100	Double	Multipurpose NPC AI state/timer 3
NPC AI 4	NPC+0x108	Double	Multipurpose NPC AI state/timer 4
NPC AI 5	NPC+0x110	Double	Multipurpose NPC AI state/timer 5
Direction faced	NPC+0x118	Float	Direction faced
Bounce off block	NPC+0x120	Word	0xFFFF means just bounced off a block to change direction
Kill flag	NPC+0x122	Word	Kill/Kill effect (0 = No kill/ 1-? Kill effect with kill)
Unknown	NPC+0x124	Word	Note: Must be set to 0xFFFF when spawning a new NPC
Offscreen flag	NPC+0x128	Double	Offscreen flag (0xFFFFFFFF = offscreen)
Offscreen countdown timer?	NPC+0x12A	Word	Offscreen countdown timer. 180 is onscreen. Set to 0 to force despawn.
Unknown	NPC+0x12C	Word	Unknown grabbing-related
Collides with NPCs	NPC+0x136	Word	0xFFFF indicates it collides with other NPCs. Doubles as a "grabbed" flag
Contained Within	NPC+0x138	Word	Set to the container's ID when contained in another NPC (i.e. jar)
Current Section	NPC+0x146	Word	Current section this NPC is on
Hit Count	NPC+0x148	Float	Boss Hit count
NPC Collision	NPC+0x152	Word	Seems to be set to 0xFFFF for a bullet when it destroys another NPC. May apply to all 0x136-related collisions but untested.
Invincibility frames	NPC+0x156	Word	Invincibility frame countdown for all sources of harm