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retarget or recompute vector

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Hi everyone,

I try to figure out how to retarget a vector (v in that case) in particle trails.

I explain: i got master particles who trail other particles in space, i inherit the master "v" to achieve a motion blur at render time, to avoid to much substep

that way i got smooth line at low calculation cost.

but i need to  slightly noise the trails to achieve a "moving tentacles" look. Here is the problem when i apply the noise, obviously my "fake" v vector is not aligned anymore, it's

stepped...

i tried to recompute the vector with the help of id, but since my emission is not constant ( i shot on frame 5, frame10, frame15 etc..)the incrementation of the id in not constant

to...I tried basic vector arithmetic, but i don't get results i need...I join a hip file, does anyone got an idea???

thanks by advance.

Best

H

 

PS:excuse my english, I'm French...

RecomputVelTest.hip

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