Hey guys! Im working on a project right now and i want to animate a blood vessel. For that i am using a particle simulation. The particles are supposed to collide with the bloodvessel and obstacles inside so i gave them a simple collision. It works fine exept when i want to pre roll the particle system so that the shot is allready populated on frame 1.
I did check the “allow negative Frames” in the User preferences. I dont have much experience with particle systems so i am guessing its a dumb beginners mistake.
I don’t know all the ins and outs, but I’ve had issues with negative frames in the past. I think physics and particles are best avoided in that area, especially if you need a bit of pre-roll etc.
Just plan on rendering from say frame 100 and allow 1-99 as your pre-roll (or whatever works for your scenario). Pretty sure that’s the approach I ended up taking with a bunch of cloth sims in King of Majesty.