lock to object
You can lock particle position that is relative to object's translation, rotation and scale.
[Inputs]
#Particle Stream - This pin requires a particle stream to be connected. Connection is usually not required if any of the attributes is connected.
Enabled - Enable or disable node evaluation.
Objects
Objects by RegEx - You can use regex (regular expressions) to select objects in the scene. This is a very powerful tool to automatize the process.
Objects - List of objects that you want to use. Double click on object name to remove it from the list or use Remove button. You can select multiple objects.
Animated Mesh - Enable this option if objects are animated in any way. Keeping this option disabled results in faster computations.
Properties
Use Distance - By default, particle will be locked to object at its initial distance. Enable this option if you want to specify particle distance from object surface.
Surf. Distance - Distance from the surface.
Motion Lock % - Lower this value if you don't want particle to strictly follow the object's motion including translation and rotation.
Scale Lock % - You can lower this value if you don't want particle to strictly follow the object's scaling changes.
[Outputs]
Position - Position on the surface that particle is locked to.
Normal - Normal on the surface that particle is locked to.