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James Baxter Profile picture
@_Jambax
Nov 15, 2022 • 3 tweets • 1 min read • Read on X
The magic of compute shaders.. ~0.6ms to handle damage map rendering for a 1024x1024 render target!

Hits are buffered on game-thread before being sent to GPU to do work. Super happy with this!

Gotta make it look good now... #UE5
If you're interested in following this project:
discord.gg/rrMzug9J2n

I'll try to find some time to do a write-up on this once it looks a bit better. Still some parts to smooth out, and I'm afraid the final version does require engine modifications. *sad developer noises*
Hello to any graphics programmers laughing at my "optimised" 0.6ms :D

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More from @_Jambax

James Baxter Profile picture
Nov 28, 2022
More work on the @UnrealEngine Niagara Damage Renderer!

Added a subsystem for automatic prioritisation. Factors distance, gameplay priority and starvation rules to determine which targets to update first.

You can fix a per-frame budget, and system will adjust accordingly. 1/#
The system also supports Render Target Arrays now, via a simple layer system. Acceleration data is still baked offline with an editor tool.

Adding an early-out branch for blank pixels bumped base performance too, so this test scene went from 0.7ms to 0.4ms for a 1K target.
This scales with UV coverage though, since more coverage = more pixels shaded.

Still bound by skinned triangle reading currently. Not sure if a lightweght skeletal data interface might reduce it a bit...
Read 4 tweets
James Baxter Profile picture
Nov 24, 2022
Using Niagara to draw damage masks with only a single 8-bit render target in @UnrealEngine

Works on skinned meshes and no positional map required, just a single-channel acceleration map baked offline with a custom editor tool. #UE5

Project Discord:
discord.gg/rrMzug9J2n
@UnrealEngine Hits are buffered on CPU and sent to Niagara in batches (up to 64 each-frame), so you can absolutely hammer it with hits.

Takes ~0.6ms for a 1K render target on GTX 980. Next improvement is to prioritise updating within camera view, and atlas targets for different mesh sections.
A custom in-editor tool is used to bake the acceleration data from the content browser.

Specify the mesh, choose the sampling regions abnd UV set, and it packs accordingly. Even shows a preview now :)
Read 6 tweets

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