ClemMcFly Posted May 13, 2019 Share Posted May 13, 2019 Hi Guys I have a basic question, I need to do a pyro sim based onto an alembic sim. I Used the trail object for calculated the V attribute. The sim work's fine but it's start to emit on the first frame everywhere what I would like to do is to trigger the emission based on the Velocity of each pieces. i think i can use an expression for say basically if V is superior to 0 start to emit but i don't really know which expression can be helpfull... I hope I was clear in my explanation, english is not my first language. Quote Link to comment Share on other sites More sharing options...
cudarsjanis Posted May 13, 2019 Share Posted May 13, 2019 try length(v@v). and emit only when this value is > 0. Quote Link to comment Share on other sites More sharing options...
jamesr Posted May 13, 2019 Share Posted May 13, 2019 Hi @ClemMcFly, maybe the following example file will help you out. clemmcflyemission.hip Quote Link to comment Share on other sites More sharing options...
ClemMcFly Posted May 13, 2019 Author Share Posted May 13, 2019 Hi Guys, Thanks so much for your help it worked super well with the help files ! Thanks you so much ! This forum is amazing ! If i met you both one day i will offer you a beer ! Quote Link to comment Share on other sites More sharing options...
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