mika unitycoder

Unity hotswapping notes

Unity has built-in support for hotswapping, which is a huge productivity booster. This feature works not only with graphics assets like bitmaps and meshes, but also with code: if you edit the source and save it, the editor will save the state of the running game, compile and load the new code, then load the saved state and continue where it left off. Unfortunately, this feature is very easy to break, and most available 3rd party plugins have little regard for it.

It looks like there’s a lot of confusion about hotswapping in Unity, and many developers are not even aware of its existence – which is no wonder if their only experience is seeing lots of errors on the console when they forget to stop the game before recompiling... This document is an attempt to clear up some of this confusion.

Nota bene, I’m not a Unity developer, so everything below is based on blog posts and experimentation. Corrections are most welcome!

The basic flow of hotswapping

basic method

void Foo()
{
    StartCoroutine(Bar((bool myReturnValue) => {
        if(myReturnValue) { ... }
    });
}
IEnumerator Bar(System.Action<bool> callback)
{

how to download Meta Sam3D model output (gaussian splat .ply)

press F12 to open browser developer tools, open Network tab
generate some 3d object https://aidemos.meta.com/segment-anything/editor/convert-image-to-3d
view Fetch/XHR requests in the network panel
find graphql/ request (usually the last one), with data like: data: {xfair_sam3d_3dfy_model_gaussian_splat...
open the data hierarchy to find "gaussian_splat: ..." and it contains url to .ply file
copy that url and open in browser to download file

	// NOTE: this executes on all selected objects.. and compares if target is ScriptableObject
	using UnityEditor;
	using UnityEngine;

	[InitializeOnLoad]
	public static class ScriptableObjectHeaderPing
	{
	static ScriptableObjectHeaderPing()
	{
	// Called after Unity draws the default header of any inspector

	using UnityEngine;

	/// <summary>
	/// Allows a single GameObject layer to be selected from the inspector when applied to an
	/// <see langword="int" /> field. Intended to be used when a <see cref="LayerMask" />'s
	/// multiselection is not suitable.
	/// </summary>
	public class LayerFieldAttribute : PropertyAttribute
	{
	}

	using Oculus.Interaction;
	using Oculus.Interaction.Input;
	using System;
	using System.Collections.Generic;
	using UnityEngine;

	/// <summary>
	/// Renders the hand.
	/// <br /><br />
	///

	using System.IO;
	using UnityEngine;
	using UnityEditor;
	using UnityEditor.PackageManager;

	using PackageInfo = UnityEditor.PackageManager.PackageInfo;

	/// <summary>
	/// Adds a menu command to find and fix all assets that have mismatched main
	/// object names and file names. I.e., "Main Object Name '{0}' does not match

	// ==UserScript==
	// @name Replace YouTube Menu Item with My Channel
	// @namespace http://unitycoder.com
	// @version 1.2
	// @description Replace the second YouTube menu item with a link to "My Channel" and set proper scale for channel thumbnails
	// @author You
	// @match https://www.youtube.com/
	// @grant none
	// ==/UserScript==

	using System.Collections;
	using System.Collections.Generic;
	using UnityEngine;

	public class Example : MonoBehaviour
	{
	public List<ListWrapper<Vector3>> example = new List<ListWrapper<Vector3>>();

	public void ExampleFunctions()
	{

	// https://discussions.unity.com/t/how-to-disable-searcher-in-6-4/1693707/6
	// You can disable indexing of assets for advance search (this is what is crashing) by modifyin the UserSettings/Search.index file in your project:
	{
	"name": "Assets",
	"type": "asset",
	"roots": [
	],
	"includes": [],
	"excludes": [
	"Assets/Temp/",