When you render different solidThinking scenes without adding lights they have the exact same lighting. This is because solidThinking places a ‘default’ light source in the scene if there are no other lights present. Without a light source all of the renderings would be completely black, since all objects are only visible when there is some light hitting them to allow our ‘eyes’ to see them.
When you add a new light to your scene, solidThinking will automatically disable the default lighting, allowing you to design the scene as you would like. This is why it sometimes seems that the scene goes ‘black’ if you simply insert a lightinto your scene. You need to point your light source at your objects.
