Upgrading to Unity 2021 LTS

Note: Follow the advice in this section in release order. For example, if you need to upgrade your project from 2019 to 2021, read the 2020 upgrade guides to see if there are any changes that you need to make before you read the 2021 upgrade guides.

This page lists changes in the Unity 2021 LTS version which might affect existing projects when you upgrade from a 2020 version to 2021 LTS.

Note: 2021LTS is also known as 2021.3.

Page Outline

• Device Simulator
• Environment Lighting
• Environment lighting: Ambient probe and skybox reflection probe are now automatically baked
• Enable Code Coverage preference
• Particle System Force Fields
• Particle System Start Delay + Rate over Distance emission
• BuildReport - PackedAssets
• Terrain APIs out of experimental (WIP)
• Texture2D.Resize renamed to Reinitialize
• Android changes
• UI Toolkit - Default scaleMode for Image changed
• Mono upgrade behavior changes
• Adaptive Performance
• RenderTexture DepthStencilFormat
• Graphics formats DepthAuto, ShadowAuto and VideoAuto are deprecated
• WebGL: Updated Emscripten to 2.0.19
• Progressive GPU Lightmapper dropped support for CPU OpenCL devices
• OnPostprocessAllAssets behavior changes
• Mixed point and spot lights with no shadows bake direct light in subtractive lighting mode