NVIDIAGameWorks / NVIDIAGameWorks/rtx-remix

[Runtime Bug]: Sky Reprojection doesn't handle Alpha Blend Elements Correctly

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bug jira runtime
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Description

Describe the bug

When reprojecting the sky, if the sky contains alpha based elements, there is a high likelihood they will not work correctly. Changing various sky translation values have varying results.

The blending of the alpha elements look correct when "Reproject Sky to Main Camera" is OFF. This is not an option however, as skybox geometry then does not render correctly.

Tagging the cloud textures as anything seems to have little to no effect.
The cloud texture behaves this way, before AND after replacement with an edited alpha map.

sm_oceanhouse_1

Raytracing Off
Image

Ray Tracing On
Image

Ray Tracing On, Reproject Sky to Main Camera Off
Image

sm_hub_1
Ray Tracing On
Image

Ray Tracing On, Reproject Sky To Main Camera Off (Note the rooftop geometry)

Image
How do you reproduce the bug?

Install the Bloodlines RTX Mode.
In the main menu, open the console and type - map sm_oceanhouse_1 or sm_hub_1.

Look up at the sky.

Observe the cloud alpha texture on the rotating hemisphere model.

What is the expected behavior?

The runtime should correctly blend these values, while maintaining the reprojection of all other geometry elements.

Version

remix-main+39108c6f (latest pull?)

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce with the Bloodlines RTX Mode by opening the console and running map sm_oceanhouse_1 or map sm_hub_1, then inspect the cloud alpha texture on the rotating hemisphere with ray tracing and sky reprojection enabled. Compare against the reprojection-disabled screenshots and verify that alpha elements blend correctly without breaking other skybox geometry.

Written by the indexing model from the issue text.

Assessment

Domain
computer-graphics
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
38/100

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