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By Design
Votes
0
Found in
2017.4
2019.3.2f1
2020.2
Issue ID
1223405
Regression
No
UI Image element's diffuse texture is not updated when shaders are switched
How to reproduce:
1. Open user's 'UI Default Shader Texture.zip' attached project
2. Open 'SampleScene' Scene
3. Select 'Material' material in Project Browser
4. Change UI/Default shader to Standard shader in the Inspector
5. Change the Albedo texture map to 'Green' texture
6. Change shader from Standard to UI/Default shader
Expected result: 'Image' GameObject is red in the Scene View and GameView
Actual result: 'Image' GameObject is green in the Scene View and GameView
Reproducible with: 2017.4.38f1, 2019.4.19f1, 2019.3.6f1, 2020.1.0b2, 2020.2.0a3
Notes:
- Video of reproduction attached in Edit
- _MainTex property is properly updated when using primitive meshes
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Resolution Note (2020.2.X):
This is how the image component works. by default the UI uses a sprites texture as its _MainTex. If there is no sprite it falls back to the assigned materials mainTexture. If there is no material assigned or not texture on that material it falls back to a white texture.
The reason its not shown in the inspector is the property on the shader is a PerRendererData type so its not something thats assigned in the asset.
As for why it doesnt update until its in play mode, while thats just a inherient issue inside of Unity. We have no way of tracking (without causing large editor performance issues) when a material has changed to force the element to rebuild its rendering. As the UI is built into a single mesh with the batcher unless we know we need to rebuild the batch it will keep drawing what it already has.