volume material id change
hi. i want to do some effect but there is no any solutions on the web. 
1) i have cylinder - verticies grid. its my hidden animated(wave ripple etc) control geometry — «volume1».
2) on this grid i have tyflow particles spread only on verticies(cylinder’s) and constraint to them(object bind — lock to surface) 
3) i have hidden cube-brick (animated moving and animated deformations) moves through particles — «volume2»

I want my tyflow particles change material id in this moving brick volume2. 

i attached example in cinema, can anybody do it with tyflow?

Send the particles back and forth between two events, using a Surface test. One tests for "inside", one tests for "outside". Have a different mat ID in either event.

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