EvaluateFollow

Evaluate Count tracked instances against a snapshot.

Declaration

void EvaluateFollow(const FGroundQuery& Query, const FFollowRules& Rules, const double* XY, const float* Delta_m,
                                            const uint8_t* Exempt, int32_t Count, FFollowScratch& Scratch, FFollowEvaluation* Out,
                                            const FFollowBaseline* Baseline = nullptr);

Header: #include "Native/GroundFollow.h"
Module: PublicDependencyModuleNames.Add("OrreryTerrainCore"); in your module’s Build.cs.
Stability: Stable: changes within a major version only add.
Thread: Any thread, no allocation once the scratch is warm.

Parameters

Name	Type	Default	Meaning
`Query`	`const FGroundQuery&`	—	The snapshot to read; answers ExactOnly, so a tile that is not resident gives Pending.
`Rules`	`const FFollowRules&`	—	The follow rules.
`XY`	`const double*`	—	2*Count doubles, world metres.
`Delta_m`	`const float*`	—	Count reference offsets.
`Exempt`	`const uint8_t*`	—	Count bytes, nonzero = `FFollowItem::kSlopeExempt`; may be null (none exempt).
`Count`	`int32_t`	—	Number of instances.
`Scratch`	`FFollowScratch&`	—	Reusable buffers; keep one per thread.
`Out`	`FFollowEvaluation*`	—	Count results; Pending leaves the instance as it is.
`Baseline`	`const FFollowBaseline*`	`nullptr`	Read in place of Pristine for the alignment turn when set; null reads Pristine.

Note.

Any thread, no allocation once the scratch is warm. Deterministic.