Mostly Harmless

UE3:MaterialEffect (UDK)

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UDK Object >> PostProcessEffect >> MaterialEffect
Package: 
Engine
This class in other games:
UT3

If they are bShowInGame they are still evaluated and will take up GPU time even if their effects are not seen. So for MaterialEffects that are in your Post Process Chain you will want to manage them by toggling bShowInGame for when you see them if they are not always evident. (e.g. you press a button to go into "see invis things" mode which has some expensive and cool looking material. You want to toggle that on the button press and not have it on all the time)

Properties[edit]

Property group 'MaterialEffect'[edit]

Material[edit]

Type: MaterialInterface