What is URP and why does the issue occur?
In Unity’s Universal Render Pipeline (URP), pink (magenta) materials or textures are often referred to as “missing shader” or “missing material” indicators. This happens in URP due to differences in the rendering pipeline and shader compatibility between URP and the built-in Unity renderer.
The Universal Render Pipeline is a modern, lightweight rendering pipeline designed to be more optimized for real-time rendering, performance, and cross-platform support. It uses different shaders and rendering techniques compared to the built-in renderer.
How to avoid pink prefabs?
Verify Shader Compatibility
Make sure the shaders you are using in URP are compatible with the Universal Render Pipeline. Standard shaders and other built-in shaders in Unity might not work correctly with URP. You should use URP’s built-in shaders or URP-compatible shaders.
Assign URP Materials
If you are using materials from the built-in render pipeline (Legacy Unity Renderer), they might not work correctly in URP. Create new materials specifically for URP by right-clicking in the Project window and selecting “Create > Material > Universal Render Pipeline > Lit” or another URP shader type you need. Then, assign the URP materials to the corresponding objects in your prefabs.
Check Lighting Settings
Incorrect lighting settings can also cause pink prefabs. Ensure that you have proper lighting set up in your URP project. Create a URP-compatible light source and configure your lighting settings accordingly.
Verify Shader Feature Support
If you are using shader variants with different feature sets (e.g., different texture maps, keywords), make sure they are supported in URP. Some shader features from the built-in render pipeline might not be available in URP.
Reimport Assets
Sometimes, the issue can be resolved by reimporting the assets. Select the problematic assets in the Project window and choose “Reimport” from the context menu. This will refresh the asset import settings.
Verify URP Package
Ensure that you have the correct version of URP package imported into your Unity project. Make sure it’s up to date and compatible with your Unity version.
Clear Shader Cache
In Unity, go to “Edit > Preferences > Cache” and click on the “Clear Cache” button. This will clear the shader cache, which may resolve any caching issues causing the pink prefab problem.
Example in Real-Life
I had also faced the pink material issue, and here is the process of how to manage the problem.
The materials of the asset I imported were pink, so I applied one of steps above, “Assign URP Materials“.
I changed its shader to URP/Simple Lit, and then dragged the appropriate texture to the “Base Map”. Once I finished the conversion, the pink prefab issue got resolved.
By following these steps, you should be able to resolve the issue of pink prefabs in Unity when using the Universal Render Pipeline.
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