When enabling BC7 compression format for a texture in a project that has SM4 disabled will result in the last two Mip Levels being gray. This happens on any texture size. The number o mip levels may differ but it will be the last two levels that are gray.
For a resolution of 64x64 there will be 6 mips and with the final two being gray. For a 2048 texture there will be 11 mips with 10 &11 both being gray.
1. In the Project Settings > Supported Platforms > Disable all EXCEPT Windows
2. In Project Settings > Platforms > Windows > Disable DIRECTX (SM4)
3. Restart the Editor
4. With any texture, You can use Engine Content (I used AICON-Green)
5. Change the Compression Settings to BC7.
6. Enable the option in the top toolbar for Mip Level, and change the Mip Level incrementally until it turns gray.
Regression: No
Results: The last two Mip Levels turn Gray for any texture size. The number of mip levels may differ but it's always the last two that turn gray.
Expected: Last two mip levels should have a similar color to the base color of the texture.
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-29593 in the post.
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Component | UE - Graphics Features |
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Affects Versions | 4.11, 4.12 |
Created | Apr 18, 2016 |
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Resolved | Jan 24, 2018 |
Updated | Mar 27, 2020 |