Hey Alan or Jon,
Can you explain how the tree matte pass is going to work on when I come to rendering and then comping? I'm slightly confused.
When I come to rendering the trees, I render off a colour pass with the surrounding environment black holed but the trees on a coloured surface shader. I then render a pass where the environment/structures etc is on a black surface shader and the trees on a white surface shader to simulate an alpha channel.
How in After Effects do I make the black and white pass the alpha channel?.