Normal map improvement: Normal Maps looks bad in D5 on reflective surfaces

Ideas & Requests
1

Normal maps looks very bad in D5 compared to other renderers. Probably because they little fake and not take into account roughness. They even produce inverted effect on dark areas.

Also increasing normal map cause hard shadows on surface.

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image1527×857 321 KB

2

Normal DirectX o OpenGL?

3

Try this:

Tiny tool to change normal maps format? - Support / Materials and Textures - Blender Artists Community

GitHub - Mario-Hero/FlipGreenChannelTool: 能把图片的绿色通道反转的工具，用于OpenGL和DirectX法线贴图的相互转换。支持JPG/PNG/TIFF/EXR图片格式。 A tool which can invert the green channel of pictures in order to convert normal maps between format OpenGL and DirectX. Support JPG/PNG/TIFF/EXR.