For 2d game I need 3d objects with default colors. For example, this cube, all of whose faces are painted in different colors, but it looks dark without a light, and with a light brightness of the faces is changing. How can I keep the true color of the cube?
You will want to disable directional lighting, and enable “ambient” lighting. This will allow all faces to be lit equally. But beware, this can turn what looks like a 3d cube shape, into what looks like a flat blue diamond shape, on screen.
Here is the docs on how to get that setup.