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| I'm not sure I completely understand what you're doing, but am I correct that you're animating the position of a light, which is being used as an emitter by Particular? And you want the light to move at a constant speed? If so, then you might be able to do what you want with roving keyframes. Just select all the position keyframes between your first and last, right-click and select 'rove across time'. No expression needed... -Chris -----Original Message----- From: jarret langmeire [mailto:langmeire@gmail.com] Sent: Wednesday, May 23, 2012 02:27 PM To: 'After Effects Mail List' Subject: Re: [AE] Expression to maintain speed Hi David, Unfortunately that won't work since the time interval between the beams is not constant. On 23 May 2012 12:13, David Torno <torno@sydefxink.com> wrote: > You could try adding the loopOut() expression to your keyframed property > like so... > > loopOut("continue", numKeyframes=0); > > This will maintain the speed between the two keyframes as a constant speed > until the layer ends. > > David Torno > Visual Effects Artist & Supervisor > http://www.ghosttownmedia.com > O: 213.739.2290 > C: 818.391.6060 > --------------------- > http://www.sydefxink.com > http://aeioweyou.blogspot.com > http://mactex.blogspot.com > > "The most useless day is that in which we do not laugh" > -Charles Field > > On May 22, 2012, at 6:22 PM, jarret langmeire <langmeire@gmail.com> wrote: > > > Hi everyone, > > > > I've been trying to figure this out and have given up. I'm using a light > as an emitter to send out pulses to various locations within a 3d space. I > would like these pulses to travel at the same speed but can't figure out a > way of doing this when I keyframe the light to a different location - in > keyframe world the number of frames between the starting and ending > position would obviously need to be further apart the longer the distance > travelled in order to match the speed to a set of keyframes where the start > and end point are closer together. I imagine there must be an expression > that can handle this but alas, expressions are not my forté. > > > > Any help would be greatly appreciated, > > > > Jarret > > > > +---End of message---+ > To unsubscribe send any message to <ae-list-off@media-motion.tv> > -- -- Jarret |
