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Question by Kekec · Jul 25, 2015 at 03:52 PM · shadertexturewarningnormal map

Object space normal map warning the texture is not a normal map

Hi,

In my project I need a standard shader to use object space normal map. No problem when changing the shader, but ... The problem now is that because I am using an RGB texture in a normal map slot of a shader, the unity pops-up a warning window saying:

"A Material is using the texture as a normal map. The texture must be marked as a normal map in the import settings."

Sure there are two nice buttons "fix now" and "ignore", but the fix believes that only tangent space normal maps exist. And the ignore button only ignores it until I change the texture, after that when I save a scene with object using my shader, the warning window pops-up, asking me again if I wish to fix or ignore.

Does anyone know how to disable this warning?

Just to be clear. I am not talking about the warning that usually appears in the material/shader inspector, because I was able to remove that warning by changing the property name from _BumpMap to _OSNormalMap. I believe that this warning that annoys me is "global", meaning that offers a quick way to fix all textures that are being used as a normal map (tangent space), but I have no idea what criteria is using to determine if a texture is used as normal map and so I would really appreciate some help.

Best regards

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Answer by ayush3017 · Sep 09, 2016 at 10:37 AM

I know its a little late to reply but if someone faces this issue then, in your shader under properties declaration, don't write

 Properties
 {
         _OSNormalMap("Os Normal Map", 2D) = "bump"{} 
 }

instead use:

 Properties
 {
        _OSNormalMap("Os Normal Map", 2D) = "grey"{} //or some other color
 }

Also in your fragment code don't use UnpackNormal(), instead use your own function to map the normal map range [0 to 1] to [-1 to 1]. Also just changing the normal map variable won't disable the warning under the material editor window. You should also change the text next to your variable declaration in properties.

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