Adds light linking controls to the groups in cycles. This allows you to tie lights to objects within a scene and generally give you much more control over the look of your shot. It also gives you the same controls for shadows (i.e. this light causes shadows on this object but this other light does not). Caveats: Bounce lighting was not enabled for this production and this code doesn’t take into account bounce lighting at all. However our next production will most likely have bounces enabled so further work will be done on this.
The light linking settings basically have two states for lights and shadows - inclusive and exclusive. Setting the light linking to Inclusive allows lights from both inside the group and lights not in a light linking group to contribute to lighting. Exclusive only allows lighting from within the group.
Please find attached one of several patches for Blender and Cycles from Tangent Animation that were implemented for the production of Tangent’s latest film, Run Ozzy Run. It is our hope that these features will make it to the master branch of Blender as we have found that they are necessary for our production environment. You’ll find that these features either decrease render times or allow the director to more easily meet his vision on time and on budget. They are not intended to be accurate or physically correct.