I was just playing with this myself - I believe that 'frame' in the ParticleExpression node is actually referring to the age of the particle (frames since it was created) rather than the frame of the scene.
However, I have managed to do this by setting the "vel" parameter in a ParticleExpression node to 0, and then animating the "Probability" knob. Hugh Macdonald nvizible – VISUAL EFFECTS [email protected] +44(0) 20 3167 3860 +44(0) 7773 764 708 www.nvizible.com On 26 Oct 2011, at 13:34, Thomas Volkmann wrote: > Hey list, > > I want my particle-system to change from channel a to b in frame 50. > Therefore I take a particleExpression Node and write frame==50 down in the > "chans"-field and "set to" to b. > The Particles change to channel b now, BUT not all of them in frame 50. It > seems that "frame" is somehow relative to the frame where the particle was > emitted. > Is that expected behaviour? > In the end I want to freeze my simulation at a certain frame, is this the > right approach to do that, or is there another way? > And as it is my first day playing with Nuke-particles, is there a way to > debug stuff (e.g. to see which value is passed to the particles from that > "chans"-field)? > > Thanks, > Thomas > > P.S.: there is a simple sample scene attached > -- > Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir > belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de > <particle_states.nk>_______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
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