UE5 NvRTX Volumetrics

Gaming and Visualization Technologies Engines Unreal
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1

Hi,

In my current UE5 (NvRTX) project, volumetrics are visible both with Lumen and with the regular Path Tracer, but when I switch to RTXGI PT, all volumetrics disappear.

My questions are:

  1. Does RTXGI PT currently support Heterogeneous Volumes (Sparse Volume Texture / VDB)?

  2. Does RTXGI PT support Volumetric Clouds in UE5?

  3. If not, is there any recommended way to get a similar volumetric look when using Lumen + RTXGI (settings, workarounds, or alternative volumetric setup)?

I’m not concerned about performance – I’m aiming for the most cinematic result possible. However, I can’t reliably use the classic Path Tracer for final rendering, because the memory grid fills up very quickly, making it unusable for my production scenes.

Thanks.

2

What version of UE5 are you using? RTXGI is an outdated technology before UE5.0, and NVRXDI is the new technology. Have you tested using the new NVRX5.6 version?

3

Welcome @Kawiszz and @llmmddkk to the NVIDIA developer forums.

With the introduction of Lumen in Unreal Engine 5 the team put direct support for RTXGI as a plugin to UE on hold since proper integration would have been rather complex compared to the possible benefit of RTXGI over Lumen.

But RTXGI as a technology is far from outdated, it is still actively being developed here: GitHub - NVIDIA-RTX/RTXGI: RTXGI v2.0 Update including Neural Radiance Cache and Spatial Hash Radiance Cache

That means if you want to use RTXGI as part of your UE 5 project, you need to manually integrate the latest version with your project.

I hope that clarifies things.

Thanks!
Markus

4

I’m very pleased to receive your reply. Thanks!