Overscan Support

Use Overscan to achieve pixel perfect render continuity across multiple render nodes when cluster rendering with nDisplay and with post effects enabled.

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Limitations
Supported Rendering Features

Achieve pixel perfect render continuity across multiple render nodes when cluster rendering with nDisplay and with post effects enabled. By overscanning in configurable direction(s), and then cropping out the extra rendered pixels with an exposed amount, users can decide on a (visual accuracy vs performance) ratio that works best for their project.

Visually impactful effects such as bloom, ambient occlusion or motion blur can now be enabled in most nDisplay projects - at some configurable performance cost.

Limitations

Auto-exposure should remain disabled as overscan cannot fix this.
This technique works well when the range of the post effect doesn't exceed the set overscan percentage. It is designed to help reduce or minimise visual discrepancy since the percentage is arbitrary.
This implementation works with Simple screens and projection policies. More advanced ones such as Mesh aren't supported at the moment.

Supported Rendering Features


Feature	nDisplay Compatibility	Solution	Notes*	Visual Impact	Accumulation Buffer	In-Camera VFX Compatible
Rendering / Post Effects
Bloom	Yes*	Overscan	Keep radius small	High	No	Yes
Lens Flare	No	Avoid		High	No	Yes
Auto Exposure (Eye Adaptation)	No	Avoid	Will separate type of logic.	High	Yes	Yes
Motion Blur	Yes*	Overscan		Medium	No	Yes but not working well for cinematography.
Depth of Field (DoF)	No	Avoid
Screen Space Ambient Occlusion (SSAO)	Yes*	Overscan	Keep radius small	Medium	No	Yes
Temporal Anti Aliasing (TAA)	Yes*	Overscan		Low	Yes	Yes
Screen Space Reflections (SSR)	No	Avoid		High	Yes	Yes
Screen Space Global Illumination (SSGI)	No	Avoid		High	Yes	Yes
Vignetting	Yes*	N/A		Medium	No	Yes
Scene Fringe (Chromatic Aberrations)	Yes*	Avoid	Keep radius small	Low	No	Yes
Raytracing (Denoiser)	No			Low	No	Should work but noise is non-deterministic.
Rendering / Other
Planar Reflections	Yes*	N/A	Users can customize the FOV setting.	High	No	Yes
Sky Atmosphere	Yes	N/A	Fixed	High	No	Yes
Material (shader) time based animations	Yes				Sometimes
Shadows	Yes				No
Culling	Yes				No
UMG - 2D	No				No
Gameplay
Sequencer	Yes	N/A	N/A	High	No	Yes
Blueprints	Yes/No	Avoid randoms	Works if using seeded randoms. There is also the BeginPlay issue not running when BP is reconstructed.	High	Sometimes	Yes
Physics (Chaos solver) IKRigid bodiesCloth	Yes	Yes		High	No	Yes
Particle System Cascade / Niagara	Yes	N/A	Deterministic setting must be set to ON for emitters.	High	Sometimes	Yes
Media / Playback
Video / Image sequence	N/A	N/A	Video engine currently not frame accurate.	High	No
Video I/O, BM, Aja	N/A	N/A	N/A	High	No
NDI/SMPTE 2110	N/A	N/A	Need to test for frame accuracy.	High	No

* The feature functions within limits. For example, Bloom functions for small/medium bloom radiuses as opposed to large blooms which would not make sense or function well in terms of the performance - visual ratio. Refer to the Notes for further details for individual features.

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