I'm getting some nice pictures from my ray tracer but I've noticed a problem with some geometry setups. For example, this pile of spheres:
Between the lower and the middle level, the inner areas are completely dark. I'm not sure if this is realistic or not (I don't have any spheres to test it with) but it doesn't look right. I think I know why it's happening - my maximum ray depth is 5, and the rays probably get stuck in the cavities and never collect any colour. Is this realistic, and can I fix it without using infinite ray depth?