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I always use following setup for relighting an object in compositing:

enter image description here

In most cases this works, but sometimes it's hard to adjust the direction of the light. Especially in terms accuracy it would be useful to adjust real values instead of rotating the light direction ball:

enter image description here

Is there more accurate way to adjust the values of the normal pass?

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One way would be to enable the Amaranth plugin by Pablo Vazquez (not included with blender by default). This addon adds many features to blender including the ability to edit the individual values of the normal node:

enter image description here

While the changes aren't visible in the node itself, when the node is selected extra options appear in the properties panel (N) in the node editor.

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