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Pyro Sim trigger by the velocity of an alembic
ClemMcFly posted a topic in General Houdini Questions
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.