pflow and script controller

[magicm]

Georg,

Particle flow is history dependent, which means that if you put the timeslider on frame 50, it needs to evaluate the flow from frame 0 to frame 50. So in your case this means the script-controller gets executed 50 times. Since your script-controller calculates its value based on relative time, this obviously messes up its output.

I've modified your code so it uses absolute time values instead of relative. The first variable i defines the interval in which the helper moves/freezes, and the second variable s defines the movement per frame. In my example, the animation will loop at frame 200. I'm sure this script could be shortened/optimized, I just wrote it quickly so you have an idea. Uncomment the "format ..." line to have the script print the p and q values to the listener (better turn off PFlow if you do this though).

Cheers,
Martijn

i = 10f -- move/freeze interval
s = .01 -- movement per frame

-- check in which "interval" current time lies
d = mod (F / i) 2

-- calculate movement value
p = ((d + ((F / (i*2)) as integer)) / i) * (s / .01)

-- calculate freeze value
q = ((((F / (i*2)) as integer)) + 1) * (s / .1)

-- format "p:%, q:%\n" p q

-- set percent
if d < 1 then p else q

[rdg]

Martijn,

thanks for that explanaiton and the example.

If it is not possible to use the history-independent operators of box#3 it might be better to bake the movement before activating/adding pflow.

Anyway - this reminds me not to depend too much on this this.setConstant stuff. It is very handy - but as you showed it is possible to find forumulas for such tasks.

Georg

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