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Unreal Engine C++ API Reference > Runtime > Engine > Particles > Collision > UParticleModuleCollision
Syntax
float VerticalFudgeFactor
Remarks
The fudge factor to use to determine vertical. True vertical will have a Hit.Normal.Z == 1.0 This will allow for Z components in the range of [1.0-VerticalFudgeFactor..1.0] to count as vertical collisions.