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 > > >
