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> Unreal Engine API Reference > Runtime > Navmesh > Recast > rcErodeWalkableAndLowAreas

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rcErodeWalkableAndLowAreas

Erodes the walkable area within the heightfield by the specified radius.

Windows

MacOS

Linux

References

Module	Navmesh
Header	/Engine/Source/Runtime/Navmesh/Public/Recast/Recast.h
Include	#include "Recast/Recast.h"
Source	/Engine/Source/Runtime/Navmesh/Private/Recast/RecastArea.cpp

Syntax

bool rcErodeWalkableAndLowAreas
(
    rcContext * ctx,
    int radius,
    unsigned int height,
    unsigned char areaId,
    unsigned char filterFlags,
    rcCompactHeightfield & chf
)

Remarks

Erodes the walkable area within the heightfield by the specified radius. Additionally, it will mark all spans that are too low (rcMarkLowAreas)

Basically, any spans that are closer to a boundary or obstruction than the specified radius are marked as unwalkable.

This method is usually called immediately after the heightfield has been built.

Returns

True if the operation completed successfully.

Parameters

Parameter	Description
ctx	The build context to use during the operation.
radius	The radius of erosion. [Limits: 0 < value < 255] [Units: vx]
height	Height threshold [Units: vx]
areaId	The area id to apply [Limit: <= ]
filterFlags	See: rcFilterLowAreaFlags
chf	The populated compact heightfield to erode.