The Coat Reflection Render Channel isanalogous to the Reflection Render Channel, with the main difference being that all Coat render channels can be subtracted from the main back-to-beauty composite, graded, and added back in.
The Coat Reflection Render Channel stores reflection information calculated from the materials' reflection values in the scene. Surfaces with no reflection values set in their materials contain no information in the render pass and, therefore, render as black.
The Coat Reflection Render Channel is formed by multiplying the Raw Coat Reflection Render Channel by the Coat Filter Render Channel. So, while the raw coat reflection pass gives the full reflection of objects reflecting in the scene, the coat reflection filter sets how muchof that reflection should come through in the composite. The two are multiplied together to create the Coat Reflection pass, which gives a true representation of the reflection in the scene.
