I think this should be built into the Spin node. Morten
Den 9. april 2013 kl. 20:14 skrev Andy Nicholas <[email protected]>: > Just attached the example scene I sent Morten, in case anyone else finds it > useful. > > > > > > > > Den 9. april 2013 kl. 17:20 skrev Andy Nicholas <[email protected]>: > > > > > Hi Morten, > > > The only issue with randomising or turbulising it, is that the particles > > > will > > > look like they're being acted on by some sort of force because their > > > angular > > > momentum is varying. > > > > > > If you want something a little more like tumbling debris in zero gravity, > > > then > > > during emission; store a random unit vector (A) to rotate the particle > > > around. > > > Use Randomise By Cone to generate another unit vector (B) at 90 degrees to > > > vector A, but at a random 360 orientation about it. Store this vector too. > > > It > > > will be used to rotate vector A on each frame. Finally, store two random > > > rates > > > of rotation. One for spinning the particle around A, and one for spinning A > > > around B. > > > > > > All that stuff is just your initialisation. On each frame you just rotate > > > vector > > > A using B and one of the rates of rotation (Angle+Axis). Then rotate the > > > particle using vector A and the other rate of rotation. > > > > > > It should look fairly natural, although I doubt it obeys conservation of > > > angular > > > momentum exactly. > > > > > > Cheers, > > > A > > > > > > > > > > > > On 09 April 2013 at 12:38 Morten Bartholdy <[email protected]> wrote: > > > > > > > > > > Which is the best method to make totally randomly tumbling particles in > > > > ICE? I > > > > am doing it with Spin Particle and altering the input axis with > > > > Randomizing > > > > the rotation by cone. I am thinking I would like to turbulize direction > > > > of the > > > > the vector instead of randomizing but have not cracked that one yet. > > > > > > > > Is there a more elegant way to make particles tumble (flying slowly > > > > through > > > > the air) totally randomly? > > > > > > > > Morten > > > > > > > > > > > > > >
