How to make every side of an object light the same?

Question

In this case, I would like them to be the same light red as the left side without ambient light

Answer 1

If you want an object with the same colour in all faces without having the light to change in the scene you can use an unlit material

1. create a new material

2. select an unlit shader (for example default/unlit)

3. apply that material to your object

4. apply a texture with a flat colour that you want (for example a simple PNG of the red colour)

Now you have an object all with the same colour in all faces and it is not affected by light.