What about the spin particle compound? It has a tumble function..
On Tue, Apr 9, 2013 at 8:20 AM, Andy Nicholas <[email protected]> wrote: > 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 > > > > > > >
