This message is displayed when Corona detects a Corona Normal map containing a texture loaded with incorrect gamma.
Solutions:
- Run the Corona Converter Script to attempt to fix the issue for all problematic normal maps.
- Alternatively, you can perform a quick fix by enabling the “Add gamma to input” checkbox in the Corona Normal map containing offending input.
- When loading a bitmap file through the “Select Bitmap Image File” window, at the bottom part of the window, in the Gamma section, click "override", and set its value to 1.0.
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Normal Map - correct result |
Normal Map - incorrect result due to wrong gamma correction |
Note: Corona will attempt to detect whether a normal map texture is loaded correctly or not, but it might sometimes fail. This will result in displaying this error message even if the normal map is loaded correctly, and the material is looking as expected. To learn more, see this short guide: How to use normal maps?