NVIDIAGameWorks / NVIDIAGameWorks/rtx-remix
[Runtime Bug]: Sky Reprojection doesn't handle Alpha Blend Elements Correctly
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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
Ray Tracing On
Ray Tracing On, Reproject Sky to Main Camera Off
sm_hub_1
Ray Tracing On
Ray Tracing On, Reproject Sky To Main Camera Off (Note the rooftop geometry)
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
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- 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