NEW IN R20
As with the bump effect, the Normal channel can be used to manipulate the surface shading to simulate tiny details. The Normal channel, however, does not use color information to define the effect. This makes it possible to precisely orient the Normals in the X, Y or Z directions. The effect can deliver even more precise results while not affecting the object’s geometry.
Here you can link a Normal texture or a corresponding Material Node.
This is the intensity of the Normal effect. Negative values will invert the effect. Note that the Normal effect will not modify the object’s shape when generating the shading effect. If the effect is made too strong it will look unnatural.
The remaining settings reflect those of the material’s Normal Mode when set to Normal Map in its Diffuse channel (see here).