If you want to elongate the freeze (taking place at frame 20 in that script), you just have to change the ParticleExpression chans knob to tell it when you want to place the particles in the 'b' channel being acted on by the downstream forces.

i.e. change the 'chans' knob to frame==30 if you want it to freeze for 10 frames before the ParticleGravity kicks in.

Cheers,

Sean



Sean Brice wrote:
Hi Guys,

Ari, if I follow you correctly you can use a combination of a ParticleDrag node and a ParticleExpression node (to change the channel the particles are in at a particular frame), then apply the forces to that channel downstream to get what you are after.

Have a look at this example Nuke 6.3v7 script. Is that what you want?

Cheers,

Sean



Moritz Moeller wrote:
On 5/17/2012 1:20 PM, Diogo Girondi wrote:
A "hold" node for particles would be great.

Can't a particle expression be used to set velocity to zero?

.mm
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