Unreal Engine 4.26 Documentation

Unreal Engine 4.27 Documentation

Unreal Engine 5.0 Documentation

Unreal Engine 5.1 Documentation

Unreal Engine 5.2 Documentation

Unreal Engine 5.3 Documentation

> Unreal Engine API Reference > Plugins > ModelingComponents > Selection > UPolygonSelectionMechanic > TopologyHitTest > UPolygonSelectionMechanic::TopologyHitTest

Light Theme

Dark Theme

UPolygonSelectionMechanic::TopologyHitTest

Perform a hit test on the topology using the current selection settings.

Windows

MacOS

Linux

References

Module	ModelingComponents
Header	/Engine/Plugins/Experimental/MeshModelingToolset/Source/ModelingComponents/Public/Selection/PolygonSelectionMechanic.h
Include	#include "Selection/PolygonSelectionMechanic.h"
Source	/Engine/Plugins/Experimental/MeshModelingToolset/Source/ModelingComponents/Private/Selection/PolygonSelectionMechanic.cpp

Syntax

bool TopologyHitTest
(
    const FRay & WorldRay,
    FHitResult & OutHit,
    FGroupTopologySelection & OutSelection,
    bool bUseOrthoSettings
)

Remarks

Perform a hit test on the topology using the current selection settings. In cases of hitting edges and corners, OutHit contains the following: OutHit.FaceIndex: edge or corner id in the topology OutHit.ImpactPoint: closest point on the ray to the hit element (

not a point on the element!) OutHit.Distance: distance along the ray to ImpactPoint OutHit.Item: if hit item was an edge, index of the segment within the edge polyline. Otherwise undefined.

Parameters

Parameter	Description
bUseOrthoSettings	If true, the ortho-relevant settings for selection are used (selecting down the view ray, etc)

Help shape the future of Unreal Engine documentation! Tell us how we're doing so we can serve you better.

Take our survey

Dismiss