1. Download "Rakurri_Gradient_Map_Set_V1.0.bundle"! Here is a handy link: https://github.com/Rakurri/rakurri-gradient-map-set-for-krita/releases/tag/V1.0 ...
To edit the texture map of a 3D object, you can you use any software that can draw on a .png file. Because it is free and simple I will be using Krita for this tutorial. Below is a piece of a texture ...