David Peicho

Graphics enthusiast • #opengl #webgl #webgpu #cpp #js #rust • Rendering Engineer @WebXREngine • On the side I do WebGPU raytracing • Views are my own.

[David Peicho @DavidPeicho]

@TheChowdhary That's simply not true at all. Simple projects used to be great to judge the level of someone.
What can easily be generated is indeed not impressive anymore, but dedicating time and effort to push a project far and beyond is valuable.

[David Peicho @DavidPeicho]

With a slightly different lighting

[David Peicho @DavidPeicho]

"Lone monk" scene by Carlo Bergonzini, rendered in albedo, my #rust #webgpu pathtracer (no RT cores).

Good result, but still a long way to go :)

(Unfortunately the roof tiles were made of a Blender modifier, and don't look that good on this export 😅)

[David Peicho @DavidPeicho]

Trying to compile WebKit to attach XCode. Unfortunately that shut down my laptop every single time at half the compilation 🤔

[David Peicho @DavidPeicho]

I have a pretty weird #webgpu (#rust/#wgpu wasm codebase) issue only on Safari, where compute passes don't output anything to buffers.

Worse: I have a command encoder with [compute, compute..., debug_blit], the debug_blit is broken except if moved to another submit.

Anyone?

[David Peicho @DavidPeicho]

@MrCollison This is possible all thanks to https://t.co/jMWhywtRnw

Once you have this library, it's not much work.

[David Peicho @DavidPeicho]

Not posting here much those days, but here is a Firefox vs Native comparison on my #webgpu #rustlang pathtracer.

Performance hit is clear in the web version. This scene is GPU bound, no CPU work and no CPU -> GPU flow.

Weirdly, Chrome is barely usable compared to Firefox.

[David Peicho @DavidPeicho]

@castano @SoftEngineer Hey, thanks! I know about Spark, it looks really good :) Was just wondering what was done here

[David Peicho @DavidPeicho]

@BrianBreiholz @sampavlovic You need an indirection lookup, contains LOD info and data start. Then based on the LOD you know how to perform the linear interpolation of the samples

[David Peicho @DavidPeicho]

@mrdoob Baked directly using the WebGLRenderer / WebGPURenderer and converted to spherical harmonics?

[David Peicho @DavidPeicho]

@WebXREngine Shout-out to @pezcode and @noerihuisman for creating the original meshlet PoC that is the foundation of what will be available in 1.6.0!

Crazy to think that they prototyped that during a fun offsite in Austria :)

[David Peicho @DavidPeicho]

In order to start diversifying your timeline from AI-only content, here is a video of the next @WebXREngine version.

Both showcase meshlets with hierarchical culling, roughly 32*32*130K tris, nicely frustum / LOD culled.

Running on #webgl via Wonderland Engine

[David Peicho @DavidPeicho]

@ccallac7 With time you get better at understanding all the overloads it tried to resolve. I would also recommend to ditch the std and use better containers.

[David Peicho @DavidPeicho]

@ocornut Took a bit of setup, but VSCode + Cmake extension + LLDB extension is nice enough. I wrote some lldb provider for custom containers.

The only pain point is that sometimes the debugger view just freezes. Obviously doesn't happen on LLDB cli

[David Peicho @DavidPeicho]

@Sorskoot @WebXREngine Nice! Love the game idea

[David Peicho @DavidPeicho]

@mrmaxm @WebXREngine Mix of both, we do build a voxel representation to efficiently place bricks mapping to the probes SH data.

The SH itself is however generated from camera rendering to cubemap.

[David Peicho @DavidPeicho]

@mrmaxm @PlayingInCanvas @squareys L1 SH, actually it's 1.25mB total, I made a mistake above

[David Peicho @DavidPeicho]

@PlayingInCanvas @squareys This exact scene is 2.5mB, with 52K probes.

The sparser the scene is (think outdoor scene with props), the lighter the GI will be. Sponza is relatively dense, except in the middle corridor.