I'm trying to fill with colors each square inside the cube I drew with the pen tool. I made a custom grid and finally came up with the following shape:
The problem, is that I cannot find a way to color each part of this cube, and even fill parts if I merge this cube for another, here is an example:
Basically, fill those closed areas with a color or gradient. It is not letting me.
How can I achieve filling with color those areas with a different color each?