18 lines
1.5 KiB
Markdown
18 lines
1.5 KiB
Markdown
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---
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uid: urp-prep-shader
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---
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# Prepare and upgrade sprites and projects for lighting
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To light a sprite with [2D lights](2DLightProperties.md), first go to the [Sprite Renderer](xref:class-SpriteRenderer) component of the sprite and assign a material with a Shader that reacts to 2D lights. When you drag sprites onto the scene, Unity automatically assigns the `Sprite-Lit-Default` material to them which enables them to interact and appear lit by 2D lights.
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You can also [create a custom Shader](ShaderGraph.md) that reacts to lights with the [Shader Graph package](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest).
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## Upgrading existing materials
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If you are installing the URP package into an existing project with preexisting prefabs, materials or scenes, you will need to upgrade any materials used to a lighting compatible Shader if you want to use the package's 2D lighting features.
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**Warning:** The following task automatically upgrades a scene or project in a one way process. Unity can't revert upgraded scenes or projects to their previous state. Before you start this task, back up any files you don't want to lose or converted.
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To upgrade your project, go to **Window > Rendering > Render Pipeline Converter**. Enable **Material Upgrade** and then select **Convert Assets** to begin the upgrade.
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For information on converting assets made for a Built-in Render Pipeline project to assets compatible with 2D URP, refer to [Render Pipeline Converter](features/rp-converter.md#converters).
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