Velocity
- Normal
- The emitter's surface normals (i.e. let the surface normal give the particle a starting speed).
- Let the tangent speed give the particle a starting speed.
- Rotation
- Rotates the surface tangent.
Emitter Object
- Align
- Object
- The emitter objects movement (i.e. let the object give the particle a starting speed).
- Random
- Gives the starting speed a random variation.You can use a texture to only change the value, see Controlling Emission, Interaction and Time.