smaugthewyrm Posted September 15, 2011 Share Posted September 15, 2011 (edited) peter quint shows how to control dissipation of smoke here: fast forward to TIME CODE 19m25s PQ smoke from particles I LINK the technique he uses you should be able to adapt to your effect. he wants to dissipate faster, you would just do the reverse... Edited September 15, 2011 by smaugthewyrm Quote Link to comment Share on other sites More sharing options...
chimeric Posted September 16, 2011 Author Share Posted September 16, 2011 smaugthewyrm: Hey thanks for the tip. However this is the problem, its easy to dissipate smoke but to reverse it, is much harder. Of course I could do like Peter did, but instead of multiplying by 0.5 do it by 1.5. This however cause the smoke to grow not only along the length of the path but also on the sides, quite dramatically. It is very hard to control its look and shape, the gas becomes very dens and chunky and eventually it might fill the whole container. Anyway as I said in previous post, I have kind of solved it. The problem was with the velocity field not density Quote Link to comment Share on other sites More sharing options...
chimeric Posted September 20, 2011 Author Share Posted September 20, 2011 Another test, this time just smaller adjustment to the look and speed of the simulation. http://vimeo.com/29288965 Quote Link to comment Share on other sites More sharing options...
Netvudu Posted September 20, 2011 Share Posted September 20, 2011 I´m going to say you sized down too much your container. The smoke is being cut at the left side, but....you already know that Apart from the strange shape when its born, everything looks dead on. I suppose this shape isn´t that important as you would probably add a lot of stuff at the point where the Tornado is born (dust, debris, etc...) and some compositing tricks are to be expected as well. Quote Link to comment Share on other sites More sharing options...
chimeric Posted September 20, 2011 Author Share Posted September 20, 2011 Hey, yeah since these are test (and I am working on my old laptop) I am trying to get the results as fast as possible so I have small container and low res. I am still thinking about improving the bottom though. I guess it looks weird because it has giant box container sitting there . However you are right that I could mask it with other effects or/and compositing as well. Thx for feedback Quote Link to comment Share on other sites More sharing options...
chimeric Posted September 26, 2011 Author Share Posted September 26, 2011 Another test: http://vimeo.com/29629180 Quote Link to comment Share on other sites More sharing options...
chimeric Posted October 5, 2011 Author Share Posted October 5, 2011 Hey guys, I have posted this as a problem on sidefx forum but I thought I will also share here with it here. I was experimenting again and I used VOP Force instead of Gas Field VOP. Then I realised that even though GF VOP and VOP Force had almost identical networks, the latter one was using only one core of my CPU whereas GF VOP could easily occupy all 8. It is very puzzling to me since I thought that all the nodes based on VEX are multi-threaded. The VOP Force does not seems to have that "skill". Any ideas? Quote Link to comment Share on other sites More sharing options...
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