Terrarum/REFERENCING.md

Prefix-ID Referencing

Every blocks and items have Prefix-ID Referencing scheme, which is defined as follows:

<Prefix>@<Modname>:<Integer ID>

where Prefix is predefined (see below), Integer ID is arbitrarily chosen within a domain.

Prefixes

Name	Description
wall	Wall, only used by the Inventory to differentiate walls from blocks (therefore wall shares same "ID Space" with blocks/fluids/wires)
item	Item (Static), uses different "ID Space" with blocks/walls/fluids/wires

Notes:

• BlockCodex and ItemCodex will not store prefix part of the ID, as blocks and walls are identical in properties
• Wires and Fluids use the same "ID Space" as the tiles; they just happened to exclusive to their own layers. This simplifies many things e.g. only one TileID-to-AtlasTileNumber map is needed and the renderer will greatly benefit from it.

Predefined Modnames

Name	Description
dyn	Dynamic Item
actor	Actor As an Item. Integer ID is identical to the actor's Reference ID
virt	Virtual Tile Number

Integer ID Domains

Range	Description
1..2147483647	Integer ID for dynamic items
0x1000_0000..0x7FFF_FFFF	Reference ID for Actors (1879M possible)
1..2147483647	Integer ID for virtual tiles

• dynamic items have own properties that will persist through savegame.

Actor range in-depth

Range	Description
0x1000_0000..0x1FFF_FFFF	Rendered behind (e.g. tapestries)
0x2000_0000..0x4FFF_FFFF	Regular actors (e.g. almost all of them)
0x5000_0000..0x5FFF_FFFF	Special (e.g. weapon swung, bullets, dropped item, particles)
0x6000_0000..0x6FFF_FFFF	Rendered front (e.g. fake tile)
0x7000_0000..0x7FFF_FFFF	Rendered as screen overlay, not affected by light nor environment overlays

Actor IDs are assigned in 256 groups, single actor can have 256 sub-actors