KOGA Mitsuhiro shiena

Vision Pro style API on Godot

Overview

Apple recently unveiled the Vision Pro. This type of device is mostly designed for augmented reality (AR), in the sense that it should be able to throw 3D models and rendering combined into a camera.

Normally with pass-through AR, one would expect to get the camera feed as an image and maybe some environment cubemap generated from the camera to apply proper lighting into the objects.

技術文書の書き方

このメモは、私（@ymmt2005）が長年にわたってソフトウェアプロダクト開発に関わってきて 2022年現在こうしたほうが良いと考えているベストプラクティスです。

科学的な分析等に基づくわけではない経験則であるため、今後も随時見直すことがありますし、ここに書いてあることが常に正しいわけでもあらゆるソフトウェア開発に適するわけでもありません。

しかしながら、実務経験が豊富で、モダンな技術スタックに明るいエンジニアの経験則は一定の役に立つのではないかと考えて記します。

Official

https://mlapi.network/
Relay Server https://github.com/MidLevel/MLAPI.Relay
Transports (RufflesTransport is good!) https://github.com/Unity-Technologies/MLAPI.Transports
(new)Document https://mp-docs.dlt.it.unity3d.com/

Example Project

50 players FPS https://github.com/Inverse101/MLAPI_FPS
Amoung us clone https://github.com/TJHeuvel/UniteUs

A half-hour to learn Zig

This is inspired by https://fasterthanli.me/blog/2020/a-half-hour-to-learn-rust/

Basics

the command zig run my_code.zig will compile and immediately run your Zig program. Each of these cells contains a zig program that you can try to run (some of them contain compile-time errors that you can comment out to play with)

Modernizing a codebase for C# 9

There are lots of cases that you can improve. The examples use nullable reference types, but only the WhenNotNull example requires it.

Use the property pattern to replace `IsNullorEmpty`

Consider adopting the new property pattern, wherever you use IsNullOrEmpty.

string? hello = "hello world";


	Shader "Misha/Schwartzschild"
	{
	Properties
	{
	[Header(Black Hole)]
	_EventHorizonRadius("Event Horizon Radius", Range(0.0, 0.5)) = 0.075

	[Header(Accretion)]
	[HDR] _AccretionColor("Color", Color) = (1,1,1,1)

	/**
	* Proximity Fade shader include
	*
	* Based on Godot's proximity fade shader feature:
	* https://github.com/godotengine/godot/blob/97b8ad1af0f2b4a216f6f1263bef4fbc69e56c7b/scene/resources/material.cpp#L1643
	*
	* Usage:
	// Include snippet
	#include "proximity-fade.gdshaderinc"

	using System;
	using System.Net;
	using System.Net.Http;
	using System.Runtime.CompilerServices;
	using System.Text;
	using System.Threading;
	using System.Threading.Tasks;
	using UnityEngine;
	using UnityEngine.Networking;

	import SwiftUI

	struct ContentView: View {
	@State var theta: Double = 0
	let radius: Double = 60
	let colors: [Color] = [.purple, .red, .yellow, .blue, .green]

	var body: some View {
	ZStack {
	ForEach(Array(colors.enumerated()), id: \.offset) { offset, style in

	using Unity.Netcode;

	namespace R3.Trigger
	{
	public static class UnityNetcodeR3Extensions
	{
	public static Observable<(T previousValue, T newValue)> AsObservable<T>(this NetworkVariable<T> networkVariable)
	{
	return Observable.FromEvent<NetworkVariable<T>.OnValueChangedDelegate, (T, T)>(
	h => (previousValue, newValue) => h((previousValue, newValue)),