Add post-process effects for the widget's covered region.

Tutorial: link

PostProcessWidget vs Unreal's RetainerBox:

• RetainerBox adds effects for its contained widgets.
• PostProcessWidget adds effects for its covered region.

PostProcessWidget vs Unreal's PostProcess Materials:

• PostProcess Materials add effects for full-screen.
• PostProcessWidget adds effects for its covered region. The PostProcessWidget may be more efficient than PostProcess Materials.
• PostProcess Materials can not add effects for UI widgets. PostProcessWidget supports adding effects for everything it covered.

Precautions before buying:

• The performance of the widget is almost the same as the RetainerBox widget.
• This widget is a UI widget, so the effect materials are UI materials. If you want to apply SceneTextures for UI materials, see my other plugin "SceneTextureForUMG"