Hey Howard, Hopefully I'm overlooking something, but is there a way to control the frequency of a 'random' expression in the Particle Expression node? Normally I'd do something like random(frame/10), which doesn't work in the in that node. (random / 10) only changes the intensity of the flicker, whereas I'd like it to affect the frequency. The sin function responds as expected, but I'm not getting the nice randomization that the random function is giving me.
Thanks, Sean On Dec 11, 2012, at 5:18 PM, Howard Jones <mrhowardjo...@yahoo.com> wrote: > Yup 'age' is probably right. > > Howard > > On 11 Dec 2012, at 22:07, Howard Jones <mrhowardjo...@yahoo.com> wrote: > >> Hover over the help on the node and you'll see the variables available. Then >> it was something simply like sin(life) but as I mentioned no nuke in front >> of me so can't go into exact details. >> >> Howard >> >> On 11 Dec 2012, at 21:37, Sean Falcon <vfxco...@gmail.com> wrote: >> >>> Cheers to that! >>> >>> Could you elaborate on the 'life as the start point'? This is my first time >>> digging into the Particle Expression node, so I'm a bit green on setup at >>> the moment. >>> >>> Thanks, >>> >>> Sean >>> >>> >>> >>> On Dec 11, 2012, at 4:04 PM, Howard Jones <mrhowardjo...@yahoo.com> wrote: >>> >>>> I did the same recently and used 'life' as the start point then sine. I >>>> think. I'm in a pub after teaching so can't remember the exact variables, >>>> but it worked well and gave a good variation of twinkles. >>>> >>>> Howard >>>> P.s. if my replies get more obscure you can assume the pub ale was too >>>> good. >>>> >>>> On 11 Dec 2012, at 17:13, Sean Falcon <vfxco...@gmail.com> wrote: >>>> >>>>> Hi All, >>>>> >>>>> I have a simple particle system of dust floating in the air that I've >>>>> created inside of nuke. My usual gag of running the renders through >>>>> various 2d noise patterns for twinkling/flickering doesn't work for the >>>>> guys in stereo, so I'm trying to get that to happen in the particle >>>>> system itself. I've tried the ParticleExpression node, but for some >>>>> reason I can only get cos and sin expressions to work in the opacity >>>>> field. Is there a way to get a noise or random expression to run on a per >>>>> particle basis so they flicker throughout their lifetime? Or another >>>>> technique perhaps? >>>>> >>>>> Thanks in advance, >>>>> >>>>> Sean >>>>> >>>>> _______________________________________________ >>>>> Nuke-users mailing list >>>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>>> _______________________________________________ >>>> Nuke-users mailing list >>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>> _______________________________________________ >>> Nuke-users mailing list >>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> _______________________________________________ >> Nuke-users mailing list >> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > _______________________________________________ > Nuke-users mailing list > Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users _______________________________________________ Nuke-users mailing list Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
