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Question by babaqalex · Oct 23, 2019 at 11:11 PM · shadernan

isnan in shader seems not working properly!

I need to check NaN values in the fragment shader, but it seems that the HLSL intrinsic function isnan is not working properly.

here is the part of the shader:

 float ori;
 float4 frag(v2f I) : SV_Target
 {
     float4 c = {0,0,0,0};
     if (isnan(ori))
     {
         return c;
     }
 
     c = {1,1,1,1};
     return c;
 }  

I get white color when ori is set to 0, but when I set ori to NaN, instead of full transparent, showing the background color, it always shows black color.

so , my question is that is the isnan not supported in shaderlab, or I need to open some shader compiler flags, or else how to check this NaN value without the isnan function.

I am testing the shader in unity 2019.3.0b8 Thanks.

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Answer by marcozakaria · May 04, 2020 at 10:28 AM

 float IsNan_float(float In)
 {
     return (In < 0.0 || In > 0.0 || In == 0.0) ? 0 : 1;
 }

I tried custom function and it works.

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