Thanks for the good tips guys - I actually just found a way while digging a bit. Filter by Null and Filter By Geometry do what I need, so I have one thing solved.
I would also like to use a null to set velocity and start simulation on existing particles which are sitting idle on a surface with poly islands attached. This is what Momentum does very fine, but I would like to use surface force to push them away and can't get that working with Momentum, plus I have yet to figure out how to avoid RBD collisions between particle instance geo while keeping collisions with other geometry, so I am looking in to doing it with regular particle sim now. I guess that should be done with a Test inside Null/Volume node, but how do I use it to trigger the simulation? Morten > Den 15. november 2016 klokken 14:04 skrev Andi Farhall <[email protected]>: > > > the weightmap or test inside null rout would work but you'll end up emitting > a shed load of particles thaty ou don't need. You could use raycast or > closest location to get a point that you could use with emit from position, > but you would need to randomize the emission position in track with the scale > of the null, that would be a faster sim. > > > ........................................................................... > http://www.hackneyeffects.com/ > https://vimeo.com/user4174293 > http://www.linkedin.com/pub/andi-farhall/b/496/b21 > > > http://www.flickr.com/photos/lord_hackney/ > http://spylon.tumblr.com/ > > > This email and any attachments to it may be confidential and are intended > solely for the use of the individual to whom it is addressed. Any views or > opinions expressed are solely those of the author and do not necessarily > represent those of Hackney Effects Ltd. > > If you are not the intended recipient of this email, you must neither take > any action based upon its contents, nor copy or show it to anyone. > > Please contact the sender if you believe you have received this email in > error. > > ------------------------------------------------------------ > > > ________________________________ > From: [email protected] > <[email protected]> on behalf of Morten Bartholdy > <[email protected]> > Sent: 15 November 2016 12:44 > To: Userlist, Softimage > Subject: How to initialize particle emmision? > > I am looking at different methods for initializing particle emmmisions from > various geometry. Ideally I would like to move a Null along a surface and the > part of the surface which is inside the Null (with a volumic icon) starts > emitting particles, and stops when the null moves on away. > > Momentum has a good way to do this but gets slow due to the collisions and > with an ordinary particle sim I have gotten reasonable results with the Emit > Splash from Surface Collision compound, but it is a bit quirky with its > calculation of velocity. > > So if I have a surface and just want it to emit particles from the part of > the surface which is inside a null, how would I do that? > > Thanks > Morten > ------ > Softimage Mailing List. > To unsubscribe, send a mail to [email protected] with > "unsubscribe" in the subject, and reply to confirm. > ------ > Softimage Mailing List. > To unsubscribe, send a mail to [email protected] with > "unsubscribe" in the subject, and reply to confirm. ------ Softimage Mailing List. To unsubscribe, send a mail to [email protected] with "unsubscribe" in the subject, and reply to confirm.
