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Normal Painting template is the only template that requires manual material editing

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1. Adding the Normal Painting Template

Refer to this guide on how to add Paint System to an object:

Getting Started / Templates

With Normal Painting template added, the following setup will be added to your material:

When click Toggle Paint Mode button, you will see the mapped normals of the object, which you can modify by adding layers on top.

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Why mapped normals?

In 3D programs, a normal represents the direction of the surface of your object.

The normal vector must consists of 3 values ranging from -1 to 1, fortunately we can display those 3 values using Red Green and Blue channel. However, we cannot see negative values!

So the values are mapped to 0 to 1 range first before being displayed to you, so you can work on the normals. 👍

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Finishing up

Once you finished editing your normals. You must go into the Shader Editor and plug the nodes like shown below:

Then you can plug the modified normals to any Shader that has a Normal input