Michael Lohr michidk

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

Conventions

A = [xA, yA] is a point on the 2D plane. Same for B, C, ...
lengths are in any unit (ex: pixels)
code snippets are in JavaScript

Degrees to radians

angleRad = angleDeg * Math.PI / 180;

	using UnityEngine;
	using UnityEditor;
	using System;
	using System.Collections;
	using System.Collections.Generic;
	using System.Linq;
	using System.Text;
	using System.IO;
	using System.IO.Compression;
	using Ionic.Zip; // this uses the Unity port of DotNetZip https://github.com/r2d2rigo/dotnetzip-for-unity

	server {

	# Server name
	server_name example.com;

	# Server Port
	listen 80;

	# Webroot
	root /var/www/;

	/* Code snippets from Unite 2015 - A coder's guide to spline-based procedural geometry */
	/* https://www.youtube.com/watch?v=o9RK6O2kOKo */

	// Optimized GetPoint
	Vector3 GetPoint( Vector3[] pts, float t ) {
	float omt = 1f-t;
	float omt2 = omt * omt;
	float t2 = t * t;
	return pts[0] * ( omt2 * omt ) +
	pts[1] * ( 3f * omt2 * t ) +

	/////////////////////////////////////////////////////////////////////////////
	// int2 is similar to Vector2, but with integers instead of floats
	// Useful for various grid related things.
	//
	// - Swizzle operators xx/xy/yx/yy
	// - Extended arithmetic operators similar to shader data types
	// A few examples:
	// int2(8,4) / int2(2,4) -> int2(4,1)
	// 16 / int2(2,4) -> int2(8,4)
	// int2(2,3) * int2(4,5) -> int2(8,15)

	using System;
	using UnityEditor;

	[InitializeOnLoad]
	public class ExecutionOrderManager : Editor
	{
	static ExecutionOrderManager()
	{
	foreach (MonoScript monoScript in MonoImporter.GetAllRuntimeMonoScripts())
	{

	<?php
	add_filter( 'oembed_response_data', 'fwe_oembed_response_data', 11, 4 );
	function fwe_oembed_response_data( $data, $post, $width, $height ){
	if ( ! is_object( $post ) )
	return $data;
	if( ! has_post_thumbnail( $post->ID ) )
	return $data;

	$thumbnail_id = get_post_thumbnail_id( $post->ID );
	$image = wp_get_attachment_image_src( $thumbnail_id, 'full' );

	// The MIT License (MIT)
	// Copyright (c) 2016 David Evans @phosphoer

	// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

	// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR