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Module 

Header 
/Engine/Source/Runtime/Core/Public/Math/TransformNonVectorized.h 
Include 
#include "Math/TransformNonVectorized.h" 
Mathematically if you have 0 scale, it should be infinite, however, in practice if you have 0 scale, and relative transform doesn't make much sense anymore because you should be instead of showing gigantic infinite mesh also returning BIG_NUMBER causes sequential NaN issues by multiplying so we hardcode as 0