I've been unsuccessful so far in finding information on, or working out how to control the angle that a particle is emitted from using a normal map.
What I'm trying to do is create a texture or UV map and bake a normal map and use that texture to effect the normal that is used by the particle system to create the vectors of the particles.
Ideally I would like to be able to:
Emit a wave or hemisphere pattern from a plane.
Paint on a direction for particular patches of grass or hair.
Paint a set normal in order to simulate fabrics or faux fur that is manufactured with a direction. (eg, default blue is upright. various changes in colour tilt the hair direction)
Have I missed something simple or is this currently not possible?