Add strengthen normals node #2372
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This adds a node to strengthen/scale the normals of a normal map. This node is especially useful for making detail normal maps more or less strong.
I previously used the Add Normals node for this, but this was a bit annoying and limited since I sometimes needed a strength factor > 200. So I made this functionality its own node. As an added benefit, the Stengthen Normals is also about 2x faster than the old way I did it via Add Normals.