surface test "lag"
#1
Ive been using a surface test operator  set to "nearest velocity" to pass particles on to a surface force operator, for the effect of attached particles flying off an object when it moves. 

however there is a lag. if the object moves, the particles are triggered on the next frame it seems.. this means they momentarily pass inside the object. 

i have worked around this by passing the triggered particles into a new event with another object bind operator in, and then a time test set to one frame.    after this one frame, they pass on to the surface force event.  this works, but seems unnecessary. 

i am not sure if this is inevitable , or a bug.   

it would be good if the "surface test" operator could "look ahead" or something so that the movement of the particles is better synced with the object they are affected by.
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#2
Can you post a screenshot of your flow, and/or send the scene to support@tyflow.com?
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