particle_layout

Where everything lives in the particle system's two buffers: the 16 f32 of one particle's state, and the offsets of every field in an emitter's parameter block — frame data, physics, the packed curves, the collider records, and the grid a bound world distance field covers.

The Luau module packs those buffers and the update shaders read them, so an offset written down twice is an offset that can disagree. Every shader that touches either buffer includes this.