RasteriseKeepClear

Rasterise the footprints that touch sub-cell (SubX, SubY) into its keep-clear mask.

Declaration

void RasteriseKeepClear(const FScatterPosts& Posts, int32_t SubX, int32_t SubY, const FScatterFootprint* Footprints,
                        int32_t NumFootprints, float MarginCm, FScatterKeepClear& Out);

Header: #include "Native/TerrainScatter.h"
Module: PublicDependencyModuleNames.Add("OrbdaleTerrainCore"); in your module’s Build.cs.
Stability: Experimental: supported, may change in a minor version, with a changelog line.
Thread: Tier 1: plain C++, no allocation, deterministic in canonical order (ascending candidate index), any thread. (the header’s rule)

Description

A corridor's band is, per segment, the points whose distance to the segment is at most the half width interpolated along it on their side (left = +90° from the direction of travel, the core's convention), so its ends are round caps.

Parameters

Name	Type	Default	Meaning
`Posts`	`const FScatterPosts&`	—	The chunk's posts; place the sub-cell.
`SubX`	`int32_t`	—	Sub-cell column in the chunk.
`SubY`	`int32_t`	—	Sub-cell row in the chunk.
`Footprints`	`const FScatterFootprint*`	—	NumFootprints footprints to rasterise.
`NumFootprints`	`int32_t`	—	Entries in Footprints.
`MarginCm`	`float`	—	The largest KeepClearMarginCm of the varieties that will test the mask: distances beyond it are 255.
`Out`	`FScatterKeepClear&`	—	The mask, filled.

Note.

No allocation; each footprint touches only the mask cells within its reach (segment by segment for a corridor).