Andreas Reich Wumpf

Computational Fluid Dynamics (in graphics mostly)

Disclaimer: I have no professional education in Compulational Fluid Dynamics, these are various notes on what I found/learned when trying to learn a bit on the topic. Some of the notes lack sources as I wrote them up later often just remembering some StackExchange answer. Some things I might have misinterpreted.

Computational Fluid Dynamics (in graphics mostly)
General / Overview
- Overarching resources
General Concepts & Keywords

Wgpu degenerification performance report

TL;DR:

Compile times are 13-16% shorter if you have several backends (always on Windows), slight but consistent improvements if you use only a single one (default on Mac)
Runtime performance of compute passes gets worse by 10-30% (with a 40% worse outlier for a lot of dispatches in a single pass)
Runtime performance of render passes sometimes 17-34% better and sometimes 10% worse 🤷
Stuck doc-gen issue is fixed!
wgpu-info Windows binary size goes down, Mac binary sizes goes up unless you add more backends

	H264, 25fps:
	."C:\Users\andre\ffmpeg.exe" -i %d.png -c:v libx264 -pix_fmt yuv420p output.mp4

	H264, 60fps:
	."C:\Users\andre\ffmpeg.exe" -framerate 60 -i screenshot%d.png -r 60 -c:v libx264 -pix_fmt yuv420p output.mp4

	H265 (windows can't play it!)
	."C:\Users\andre\ffmpeg.exe" -i %d.png -c:v libx265 -pix_fmt yuv420p output.mp4


	@group(0) @binding(0)
	var<storage, read> numbers_input: array<u32>;

	@group(0) @binding(1)
	var<storage, read_write> numbers_output: array<u32>;

	var<workgroup> shared_atomic: array<atomic<u32>, 64>;
	var<workgroup> shared_workgroup_memory: array<u32, 64>;

	<!DOCTYPE html>
	<html lang="en-US">

	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title>Compiling & linking a large shader</title>
	<script src="main.js" type="module"></script>
	<script id="vertexShader" type="x-shader/x-vertex">#version 300 es

	#!/usr/bin/env python3
	"""
	Launch a command under nono with fine-grained git permissions.

	Instead of --allow-cwd (blanket read-write to the entire working directory),
	this resolves the git directory (including worktree indirection) and passes
	explicit --read / --write flags.

	Usage:
	nono-git.py [--git-read-only] [--] <command> [args...]

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="utf-8" />
	<title>Robot Description Formats: URDF and Alternatives</title>
	<style>
	body { font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.55; max-width: 1100px; margin: 0 auto; padding: 2rem; color: #222; background: #fafafa; }
	h1, h2, h3 { line-height: 1.2; }
	h1 { font-size: 2.2rem; margin-bottom: 0.25rem; }
	.subtitle { color: #666; margin-bottom: 2rem; }