Overscan Support

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

Windows
MacOS
Linux

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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