A: Yes, the NVIDIA DLSS Plugin is available to all for Unreal Engine 4.26, 4.27, and 5 Preview 2. However, non-plugin versions of DLSS are available through a standalone SDK.

A: NVIDIA provides the DLSS Plugin also within the NvRTX 4.27 branch. This will require you to download, install, and build the source locally before being able to use the plugin. To learn more on gaining access to NvRTX, please visit our Unreal Engine Developer Program.

A: DLSS workload occurs in the same spot as TAAU in the pipeline. Due to this, DOF differences are expected. Please refer to the Unreal Engine documentation for more details.

A: DLSS workload occurs in the same spot as TAAU in the pipeline. Due to this, post processing material differences can occur. Please refer to the “View Size and Render Target Size” and “Post Process Material after Temporal Upsample” sections of Unreal Engine documentation for more details.

A: The DLSS Plugin is compatible with VR Supported Unreal Engine Apps.

A: NVIDIA now has Movie Render Queue support for Unreal Engine 4.27 and Unreal Engine 5 Preview 2. Please refer to the Installation Guide as well as the Quick Start Guide in the UE 4.27 DLSS Plugin package and the Unreal Engine 5 Preview 2 DLSS Plugin package to learn more.

A: DLSS requires correct motion vectors to function properly. The r.BasePassForceOutputsVelocity console variable can be used to render motion vectors for all objects, and not just the ones with dynamic geometry. This can be useful if it's infeasible to e.g. change all meshes to stationary or dynamic.

A: Please report your findings by emailing the NVIDIA DLSS Support Team at DLSS-Support@nvidia.com. When sending your report, please also attach the *.log files from <YourProject>\Saved\Logs so we may better assist you.

A: VRS can potentially render parts of the basepass, including motion vectors with reduced resolution. However, NVIDIA DLSS requires accurate, per pixel motion vectors in order to achieve good image quality. We recommend turning of VRS when DLSS is active.

For Unreal Engine 4.27, this can be done with the built-in r.VRS.Enable console variable at runtime, .e.g, before calling UDLSSLibrary::SetDLSSMode set r.VRS.Enable to 0 when DLSS is turned on.

For Unreal Engine 4.26, this does not contain the cvar r.VRS.Enable, but could be approximated by adding this to the DLSSUpscaler.cpp static FAutoConsoleVariableRef CVarNGXDLSSVariableRateShadingOverride(

TEXT("r.VRS.Enable"),

GRHISupportsVariableRateShading,

TEXT("Console variable override for GRHISupportsVariableRateShading to conditionally allow turning Variable Rate Shading on/off at runtime when DLSS is active"),

ECVF_Default

);