Bake displacement to alpha channel I'm trying to make efficient use of texture maps in my code and it would be ideal to bake the displacement of my mesh to the alpha channel of a normalmap. Is this possible (with the BI engine)? Is this a nodes thing? I've not used them before - a good ref or detailed answer would be greatly appreciated.
You can do this as a post process in the composite nodes, after all the baking is done, with a Separate and then a Combine RGB nodes.