Improve normal strength factor and blending #1
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Neutral normal values are 0.5,0.5,1, so can't just multiply it by factor. Instead lerp to neutral.
By copying the original unity macro for `UnpackNormal` we can optimize the math a little further and have better results. We only want to lerp the xy component of the vector and then calculate the remaining z part.
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Thx for these shaders, they look very nice!
But I saw some issues with the normals.
This PR should improve that a little :)