Art of Blender
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Tweak lighting within material nodes
One of the worst parts of rendering is the time it takes to get the lighting just right. This can take endless tweaking to get just right and sometimes can be really frustrating. However, in many cases the lighting in the render is close to what you’re looking for, but just needs a few tweaks here and there. Wouldn’t it be nice to just quickly tweak lighting per material rather than the entire scene? As it terms out there’s a node just for this purpose! The geometry node.
Using the geometry node allows you to adjust the appearance of lighting in your render by blending the colors or materials over each other. While this is not actually changing the lighting direction or intensity, it does allow you to fake the effect and works very well for small changes. This technique works particularly well when adjusting the lighting on a single object, rather than a full scene.