Version: 2020.1
Using the API Updater
Upgrading to Unity 2019 LTS

Upgrading to Unity 2020.1

Note: Follow the advice in this section in release order. For example, if you need to upgrade your project from 2018 to 2020, read the 2019 upgrade guides to see if there are any changes that you need to make before you read the 2020 upgrade guides.

This page lists changes in the Unity 2020.1 version which might affect existing projects when you upgrade from a 2019 version to 2020.1.

All Mesh vertices are transformed for better UV unwrapping

Unity might change the MeshThe main graphics primitive of Unity. Meshes make up a large part of your 3D worlds. Unity supports triangulated or Quadrangulated polygon meshes. Nurbs, Nurms, Subdiv surfaces must be converted to polygons. More info
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UVs of 3D objectsA 3D GameObject such as a cube, terrain or ragdoll. More info
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you import to a project.

Unity transforms the positions of all imported Mesh vertices to scale in Unity units automatically.

From Unity 2020.1, Unity generates lightmap UVs using the transformed Mesh vertices, if you’ve enabled Generate LightmapA pre-rendered texture that contains the effects of light sources on static objects in the scene. Lightmaps are overlaid on top of scene geometry to create the effect of lighting. More info
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. Previous to Unity 2020.1, Unity generated lightmap UV maps using the original imported Mesh vertex positions, before the automatic position transformation.

UVs generated after the vertex transformation are more accurate to the original shape and scale of your imported object.

All Asset bundle hashes are different so all bundles are built

From Unity 2020.1, Unity generates a different hash for all asset bundles in your project. This ensures all bundles are built, including the ones with the same content but with different loadable paths.

The multiplayer HLAPI package is not automatically installed in project upgrades

From Unity 2020.1, install the multiplayer HLAPI package from the Package Manager if the project you’re upgrading has scriptsA piece of code that allows you to create your own Components, trigger game events, modify Component properties over time and respond to user input in any way you like. More info
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that use the multiplayer HLAPI.

From Unity 2019.1 to 2019.4, Unity automatically installed the multiplayer HLAPI package when you upgraded a project created in Unity 2018.4 or earlier.

Improved LOD baking with the Progressive Lightmapper

Unity’s Progressive LightmapperA tool in Unity that bakes lightmaps according to the arrangement of lights and geometry in your scene. More info
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consists of the CPU and GPU lightmappers.

From Unity 2020.1, the GPU lightmapper supports level of detail (LOD) baking.

The CPU lightmapper uses the same baking algorithm and this allows Unity to fully use all available CPU cores for faster baking times in ScenesA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info
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with LODThe Level Of Detail (LOD) technique is an optimization that reduces the number of triangles that Unity has to render for a GameObject when its distance from the Camera increases. Each LOD level has either a Mesh with a Mesh Renderer component (Mesh LOD level) or a Billboard asset with a Billboard Renderer component (Billboard LOD level). Typically a single GameObject has three or four Mesh LOD levels and one optional Billboard LOD level to represent the same GameObject with decreasing detail in the geometry. More info
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values above 0.

To upgrade the LOD in your Scene, clear the baked lightmap and then regenerate it. To do this:

  1. In the Unity Editor, Open Window > Rendering > Lighting Settings.
  2. In Debug Settings, click the drop-down menu on the Generate Lighting button, then click Clear Baked Data.
  3. Click Generate Lighting.

AR/VR Platforms Support

This document provides a guide for upgrading existing ARAugmented Reality (AR) uses computer graphics or video composited on top of a live video feed to augment the view and create interaction with real and virtual objects.
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/VR projects that are using Unity versions prior to Unity 2020 releases.

Enable AR/VR in Project Settings

When upgrading your existing project to Unity 2020 releases and later, you should receive a notification that states the deprecated XRAn umbrella term encompassing Virtual Reality (VR), Augmented Reality (AR) and Mixed Reality (MR) applications. Devices supporting these forms of interactive applications can be referred to as XR devices. More info
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integration (previously in Player/XR Settings) has been disabled.

During Asset import, before the Unity Editor is launched.
During Asset import, before the Unity Editor is launched.

To enable AR/VR, use XR Plug-inA set of code created outside of Unity that creates functionality in Unity. There are two kinds of plug-ins you can use in Unity: Managed plug-ins (managed .NET assemblies created with tools like Visual Studio) and Native plug-ins (platform-specific native code libraries). More info
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Management in Project SettingsA broad collection of settings which allow you to configure how Physics, Audio, Networking, Graphics, Input and many other areas of your project behave. More info
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and select your target platforms.

Note: We recommend fixing any upgrade-related script errors before installing XR Plug-in Management.
Note: We recommend fixing any upgrade-related script errors before installing XR Plug-in Management.

Virtual reality

Platform Build target Plug-in provider
Oculus Quest Android Oculus
Oculus Rift & Rift S Desktop Oculus
Windows Mixed Reality VR UWP Windows Mixed Reality

Augmented reality

Platform Build target Plug-in provider
ARCore devices Android ARCore
ARKit devices iOSApple’s mobile operating system. More info
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HoloLens UWP Windows Mixed Reality
Magic Leap One Lumin Magic Leap

Use optimal Player settings

Make sure your project’s renderingThe process of drawing graphics to the screen (or to a render texture). By default, the main camera in Unity renders its view to the screen. More info
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and quality settings are optimal. The tables below detail recommended settings by target platform.

Virtual reality

Platform Graphics API Stereo rendering modeA Standard Shader Material parameter that allows you to choose whether the object uses transparency, and if so, which type of blending mode to use. More info
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Oculus Quest OpenGL ES 3.0 Multiview
Oculus Rift & Rift S DX11 Single Pass Instanced
Windows Mixed Reality VR DX11 Single Pass Instanced

Augmented reality

Platform Graphics API Stereo rendering mode
ARCore devices OpenGL ES 3.0 N/A
ARKit devices Metal N/A
HoloLens DX11 Single Pass Instanced
Magic Leap One OpenGL ES 3.2 Single Pass Instanced

Note: “Single Pass” is no longer a rendering mode option, as “Single Pass Instanced” is more performant. If you are upgrading from “single pass” to “single pass instanced”, you may have to update custom shadersA small script that contains the mathematical calculations and algorithms for calculating the Color of each pixel rendered, based on the lighting input and the Material configuration. More info
See in Glossary
in your project.

Render Pipeline

The built-in render pipeline, Universal Render Pipeline, and High-Definition Render Pipeline are all supported in 2020.1. There are benefits to using our latest scriptable render pipelines, but it is not a requirement in this upgrade process.

Note: If you are using 3rd-party assets and/or custom shaders, you may need to update assets with shaders compatible with “single passed instanced”.

Camera in Scene

If you are using the XR Interaction Toolkit, no change is required for cameraA component which creates an image of a particular viewpoint in your scene. The output is either drawn to the screen or captured as a texture. More info
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If you are using a 3rd-party toolkit for camera tracking (OVRCameraRig, etc), make sure you have updated to the latest version. Note that upgrading to latest versions of 3rd-party tools might cause script errors, please reference 3rd-party documentation.

If you are using a Tracked Pose Driver for camera tracking, see our Migration Guide.

Upgrading 3rd-Party Toolkits

If you are using any toolkits developed by our supported platforms (Oculus Integration package, MRTK, MLTK), make sure you’re using the latest version. Note that upgrading to the latest versions of 3rd-party tools might cause upgrade-related script errors, and you may need to reference corresponding documentation of those toolkits.


Why can’t I install XR Plug-in Management in Project Settings?

You may have upgrade-related script errors that need to be fixed before installing XR Plug-in Management.

Why are OpenVR and Google Cardboard missing from XR Plug-in Management?

The OpenVR and Google Cardboard XR Plug-ins are developed and maintained by Valve and Google, respectively. Links to installation instructions for both platforms can be found in our documentation.

Is the Unity input system supported?

Yes, our supported platform integrations are compatible with the Unity input system.

Are the Universal Render Pipeline and High-Definition Render Pipeline supported?

Yes, our supported platform integrations are compatible with both the Universal Render Pipeline and High-Definition Render Pipeline.

Why can’t I view the XR Interaction Toolkit in Package Manager?

The XR Interaction Toolkit is still in preview. To view preview packagesA preview package is in development and not yet ready for production. A package in preview might be at any stage of development, from the initial stages to near completion.
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in 2020.1, you must enable it using the Package Manager tab in Project Settings. Once enabled, preview packages will be displayed in the Unity Registry of the Package Manager.

Why doesn’t Play in Editor work for my provider?

Play in editor support only works for providers that have standalone support for their provider. If the provider is not listed in the standalone section of the XR Plug-in Management provider selection UI(User Interface) Allows a user to interact with your application. More info
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then Play in Editor will not work. Check your provider documentation as they may support some other means of integrating Play in Editor support.

Why can’t I use “single pass” rendering mode?

“Single pass” is no longer supported in 2020.1 as “single pass instanced” is most performant. If your project used “single pass” rendering, you may have to update shaders in your project. Third-party libraries that use custom shaders for “single pass” may also need to be updated. You can choose to upgrade from “single pass” to “multipass” and shaders should work, but we recommend targeting “single pass instanced” for maximum performance.

How do I configure graphics API?

Graphics API is configured in Player settingsSettings that let you set various player-specific options for the final game built by Unity. More info
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(“Edit” → “Project Settings” → “Player”).

How do I configure stereo rendering mode?

Rendering mode is configured in provider-specific settings nested under XR Plug-in Management in Project Settings.

Why am I getting errors with renderScale using the XR Settings API?

renderScale has been removed and replaced with eyeTextureResolutionScale but that has been a script updater task since 2019.3. If you are upgrading from a Unity version prior to 2019.3, you will have to manually replace renderScale with eyeTextureResolutionScale.

Why isn’t input from my controllers (e.g. button presses) recognized by the XR Interaction Toolkit?

The headset needs to be detected before any device inputs can be detected. One common issue when testing, is that many people let their headsets rest on a table while debugging their interactions. The controllers won’t get recognized until you wear the headset (or the proximity sensor inside the headset gets activated). If you don’t get any input from your device, put on your headset after starting the app, or cover the proximity sensor.

Can I use the wide-angle camera on iPhones in AR Foundation apps?

ARKit does not provide the option of changing FOV of the camera.

Using the API Updater
Upgrading to Unity 2019 LTS
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