As others have noted, I would check your lights to ensure they are emitting. If you have a skylight, you may want to ensure you have a skydome, for that light to reflect, or use an ambient cubemap.
As others have noted, I would check your lights to ensure they are emitting. If you have a skylight, you may want to ensure you have a skydome, for that light to reflect, or use an ambient cubemap.