Got it Peter, I noticed that ParticleDrag did not respect the ParticleSettings parameter either. Thanks for filing the bug!
Another question - does anyone actually like this behavior? Personally, I would prefer that ParticleSettings did NOT require that you go back through your script and tweak all of your forces. -n > On Aug 5, 2015, at 3:26 AM, Peter Crossley <[email protected]> wrote: > > Hi Ned, > > I spotted and logged a bug a couple of months ago about a similar thing for > ParticleDrag: > > Bug 47753 -Particles: ParticleDrag: reduced timestep not taken into account > when applying drag > > Basically, if you had 10 steps per frame, the same drag factor will be > applied 10 times in the full frame, resulting in much slower particles than > with 1 step per frame. The workaround for this is to divide the drag factor > by the steps per frame, i.e., for 10 sub frames, change drag from 0.97 to > 0.097. > > I didn't investigate other force nodes at that time, but it wouldn't surprise > me if others suffered the same problem. I'll add a note to the bug to > investigate these too. > > As a workaround for now, Ari's colleague's suggestion is probably a good one > to avoid getting bogged down in trying to reverse-engineer what the nodes are > actually doing. It also couldn't harm to get in touch with support to > escalate the priority. > > Thanks, > > Peter. > > On 05/08/2015 01:33, Ari Rubenstein wrote: >> Ned >> >> Here is a response from one of our compers at Blue Sky that worked w/ >> particle settings heavily over the past year: >> >> "Yes, there is a correlation between particle settings and forces - the >> greater the “in-betweens” the higher I needed to set my forces. However, I >> didn’t notice a constant numeric ratio between particle settings and >> different forces. As I recall, I had to adjust for each force. I always >> set the particle settings first, then proceeded from there. That’s also why >> I used the same particle settings setup for every shot - to keep the >> tweaking factor down." >> >> Hope that helps >> Ari >> >> >> >> Sent from my iPhone >> >>> On Aug 4, 2015, at 7:13 PM, Ned Wilson <[email protected]> wrote: >>> >>> Hi Ari, >>> >>> The exact opposite. Wind X set to 5 becomes 1 with particle settings at 5. >>> >>> -n >>> >>>> On Aug 4, 2015, at 3:54 PM, Ari Rubenstein <[email protected]> wrote: >>>> >>>> Ned, >>>> >>>> are you saying that a wind X set to 5 becomes 25 with particle settings at >>>> 5 ? >>>> >>>> Ari >>>> >>>> >>>>> On Aug 4, 2015, at 5:55 PM, Ned Wilson <[email protected]> wrote: >>>>> >>>>> Hello all, >>>>> >>>>> If I drop a ParticleSettings node in my tree, and adjust steps per frame >>>>> to be something greater than 1, then it seems to multiply all forces >>>>> acting on the particle system by 1/steps per frame. >>>>> >>>>> Is this the desired behavior of the node? If so, do any of you have a >>>>> workaround other than to expression link various particle force nodes to >>>>> the ParticleSettings node? >>>>> >>>>> Thanks! >>>>> >>>>> -n >>>>> _______________________________________________ >>>>> Nuke-users mailing list >>>>> [email protected], http://forums.thefoundry.co.uk/ >>>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>>> _______________________________________________ >>>> Nuke-users mailing list >>>> [email protected], http://forums.thefoundry.co.uk/ >>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>> _______________________________________________ >>> Nuke-users mailing list >>> [email protected], http://forums.thefoundry.co.uk/ >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> _______________________________________________ >> Nuke-users mailing list >> [email protected], http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
signature.asc
Description: Message signed with OpenPGP using GPGMail
_______________________________________________ Nuke-users mailing list [email protected], http://forums.thefoundry.co.uk/ http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
