VEX problem - add point(s)... [SOLVED]

[cojoMan]

Hi guys, 

 

I want to use the pointwrangle with addpoint(geoself(), @ptnum) to clone the current point for a fulfilled condition in a pointwrangle...and it works, but just once...as soon as it creates the first point, even if the condition is further fulfilled in the animation, not one other point is added...so a point is generated only for the first time the condition makes it...

 

this is what I am using to generate a point for each 0.2 increment of an animated sine wave :

 

@increment = ch("sineInc");

//sineInc is a spare parameter, value 0.2

//crtSine is an animated sine wave attribute going between -1 and 1

//lastSineStep is initialised to the value of crtSine at the first frame of animation, and if the condition bellow is satisfied, increased with the value of increment after the point is created

 

if ( abs(@crtSine - @lastSineStep) > @increment )

    {

    addpoint(geoself(), @ptnum);

    //clone current point

    @lastSineStep += @increment;

    //increase the last threshhold with "increment

    }

 

file is attached bellow...

 

thanks.

 

thanks

 

attached a simplified scene...

sample.hip

Edited August 14, 2015 by cojoMan

[woodenduck]

Hey Nic!

 

Wouldn't you need to run over in a loop for every time the condition was met?

 

See attached -

sample_v02.hip

[cojoMan]

thanks a lot, Joe

help me out a bit more please !

 

looking at the geometry spreadsheet - I don't quite understand why :

1.after the points have been created - I would expect them to stay created - but by the end of the animation they appear and dissapear, though I have nothing that would delete them in the wrangle

2.for some reason I get 3-5 points at a time from one frame to the other - the predictable behaviour I thought would have been 1 at a time, when the condition is met...

 

still looking into it, as I might be missing something relevant, but you definately put me on the right path...I couldn't get more than one point until now, now that they are too many and blinking, I'll sort them out

 

thanks again, hope you're doing fine over there

cheers

[woodenduck]

I think the reason they don't stay created is because it's re-evaluating the incoming geometry each frame. It only has one point to run over on the input. So it checks the condition and creates the new point if the condition is met. Each frame it starts again from one incoming point and executes the first time the condition is met, then ends. Hence the loop. So it's not that they are being deleted, more like they are not being re-created. Sounds like this is a job for the solver sop!