A render_composite material allows you to apply the following full-screen postprocesses selectively (on per-material basis) rather then to the whole screen using the Auxiliary buffer:
To apply render_composite material, follow these steps:
- Set it (or a material inherited from it) in Render settings -> Composite shader field.
- Make sure that Main menu ->Render tab -> Auxiliary buffer option is checked.
- Go to the surface material. Set States tab ->Passes -> Auxiliary pass and set itDefault. It means that the material is rendered into the auxiliary color buffer.