how do i set that?

trying to create shells flying out from a gun,
just an emitter with instanced geometry and simulate rigid bodies, looks pretty good but how do i make the rate constant, exact instead of random?

like if i set it to 10 per second i want 1 ever 10 hundreds of a second..?

yeah i would like to know how to do this too… x per second does not give a constant emission.. its random

x per second seems to be constant
for instance if you set 10 per second as the rate then at 30 fps
you get 10 particles at frame 30 and 20 at frame 60 and so on.

But if you want 1 every 10 hundredths of a second then that is 100 particles
per second.

lynbo, I’m not sure it’s quite like that. What Stereo is questioning is based on the assumption that within a single frame, particles are emitted randomly, not at a fixed rate, so if 10 particles are to be emitted within one frame it doesn’t necessarily mean they’ll come out at a tenth of the frame time each.
so… is there a way to control this?

Leo

Right you are Leo
As far as I know there is no subframe sampling that can help here,
If there is I would love to hear about it.
It might be that one could dig into the emission control and timer
compounds and cobble something together.
Not sure about that though.

When you open the emmiter compound and go into the Generate Points compound there are two Generate Sample Set Nodes. Open the second one and uncheck Time Varying. This would do what you want. If you have a rate of 25/second it would emit 1 particle each frame BUT with unchecking this you loose the random distribution over the emitter surface. So you would have to compute a random emit position again after the generate sample set.

Thanks Helli for letting us know about this setting. I guess random distribution is less of an issue as you said.

Leo

Great Thanks for that Mario !
That’s great to know, its always a checkbox isn’t it?

perfect, thanks Helli