Entry 225

The follow camera's stale normal is a stack slot holding an address in the original's memory

2026-10-183mengine

Filescrates/rugrats/src/world/game/camera.rsdocs/engine/gameplay.md

The follow camera's stale normal is traced to what it holds. It cannot be carried over to the port: part of it is an address in the original's memory.

The slot (0x8006a9cc's local +0x38). The camera's line test (0x80090554 → 0x80090340 → 0x8006a9cc) hands each object's exact test (0x80069c40) one normal buffer in 0x8006a9cc's frame, at 0x801ff948 in the oracle. A hit turns the buffer in place by the object's matrix (0x80010c14 at 0x80069f8c). A start inside a box writes nothing before that turn.

Traced on level 3's shelf, every 0x80069c40 call with its buffer before and after, for 14 frames of the turn-in-place run:

• The camera's line tests each frame (0x8002655c, 0x8002661c, 0x80026798, then the view test's 0x80026a30 and the side tests) all find the slot as [x, 0, P]. P is written just before each line test and is an address in the original's memory: 0x800E17C4, 0x800E162C, 0x800E17A4, 0x800E160C, by call.
• At the view test (0x80026914, from 0x800280a0) the slot was [1642, 0, 0x800E17C4]. The shelf's turn of it (the GTE taking the low halves) gave the [1062700, 0, 889182] that the push sets to 18.

So the push from inside a box depends on where the original's heap put a record. The port keeps no such addresses and pushes nothing. The camera's doc (gameplay.md, mode 3) and Game::blocked say so.