Since we were using directional lighting with shadows the tree canopy became an issue. Light couldn't reach the two character on the branch so the scene was nicely lit but the characters were incredibly dark. I tried adding things like point and spot lights but these didn't light the characters very nicely and effected the good lighting we had on the rest of the environment. I solution I was shown was something called light linking. This was an attribute menu which controlled what lights had influences on. I duplicated the directional lighting and made one work on just the environment and the other work only on the characters. This meant the character light could pass through the tree and light the characters nicely whilst the background kept the same lighting as before. This was a great solution and the lighting created was really nice especially with scenes similar to the below shot.
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