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> Unreal Engine API Reference > Plugins > DynamicMesh > FMeshRefinerBase > FMeshRefinerBase::CheckIfCollapseCreatesFlipOrInvalid

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FMeshRefinerBase::CheckIfCollapseCreatesFlipOrInvalid

Check if edge collapse will create a face-normal flip.

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References

Module	DynamicMesh
Header	/Engine/Plugins/Experimental/GeometryProcessing/Source/DynamicMesh/Public/MeshRefinerBase.h
Include	#include "MeshRefinerBase.h"
Source	/Engine/Plugins/Experimental/GeometryProcessing/Source/DynamicMesh/Private/MeshRefinerBase.cpp

Syntax

bool CheckIfCollapseCreatesFlipOrInvalid
(
    int vid,
    int vother,
    const FVector3d & newv,
    int tc,
    int td
) const

Remarks

Check if edge collapse will create a face-normal flip. Also checks if collapse would violate link condition, since we are iterating over one-ring anyway. This only checks one-ring of vid, so you have to call it twice, with vid and vother reversed, to check both one-rings

Parameters

Parameter	Description
vid	first vertex of edge
vother	other vertex of edge
newv	new vertex position after collapse
tc	triangle on one side of edge
td	triangle on other side of edge

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