topic Re: nParticle Stuck and Random Speed in Maya Forum

nParticle Stuck and Random Speed

danielecrespini — Wed, 06 Jun 2018 18:48:45 GMT

Hi,

I created nParticles from a surface, also there's instancer give the shape of sphere to the particles. There's askydome light. I would like to have a rate of 50particle/sec but after 5/6 minutes the particles seem to be stuck. If I set up less than 20particle/sec the keep moving but they are not enough for my need.
2nd issue - Particles are moving in one direction (I tried both wind or gravity). I'm not very experience in "expression" but I don't find another way to give particles a random speed: just speed in one direction. I would like see some parcticle slower and some faster, but I don't find the right expression (maybe even the right place where I can write such expression). Any clue. Thank you

Daniele

Re: nParticle Stuck and Random Speed

sean.heasley — Thu, 07 Jun 2018 14:47:19 GMT

Hi @danielecrespini and welcome to the community!

In the emitter there should be Random Direction as well as Speed and Speed Random among many other attributes. Have you tried tweaking those values? We have an article that explains all the different settings here that may help you!

If none of that works, when you get a chance can you please zip and attach the scene file here or via dropbox/google drive or another file sharing program so I can take a look at it?

Let me know if anything changes!

Re: nParticle Stuck and Random Speed

sean.heasley — Fri, 08 Jun 2018 19:59:15 GMT

Hi @danielecrespini

Just wanted to check in to see how things were going. Are you still having this issue?

If your issue is resolved, please click Accept as Solution on the posts that helped you so others in the community can find them easily.

Re: nParticle Stuck and Random Speed

danielecrespini — Sat, 09 Jun 2018 12:04:36 GMT

Hi Sean,

Thanx for replying so quickly. I tried with your suggestion but I can barely see a difference if I spot from different prospectives. I would like to see very slow and very fast particles.

https://www.dropbox.com/s/9tplteo1wvvyclb/%2311.mp4?dl=0

D

Re: nParticle Stuck and Random Speed

sean.heasley — Mon, 11 Jun 2018 15:25:48 GMT

Hi @danielecrespini

Hmmm ok.

When you get a chance, can you please zip and attach the scene file here or via dropbox/google drive or another file sharing program so I can take a look at it?

Re: nParticle Stuck and Random Speed

sean.heasley — Tue, 12 Jun 2018 18:52:47 GMT

Hi @danielecrespini

Just wanted to check in to see how things were going. Are you still having this issue?

If your issue is resolved, please click Accept as Solution on the posts that helped you so others in the community can find them easily.

Re: nParticle Stuck and Random Speed

danielecrespini — Tue, 12 Jun 2018 22:01:13 GMT

Hi.

I sent a link my previous email

Thank you

Best

Re: nParticle Stuck and Random Speed

sean.heasley — Wed, 13 Jun 2018 13:16:03 GMT

Hi @danielecrespini

Do you mean the drop box link? That only had access to the video of your issue not the scene file itself.

You might need to edit that link or change permissions but let me know when the scene file is up!

Re: nParticle Stuck and Random Speed

sean.heasley — Thu, 14 Jun 2018 18:24:00 GMT

Hi @danielecrespini

Just wanted to check in to see how things were going. Are you still having this issue?

If your issue is resolved, please click Accept as Solution on the posts that helped you so others in the community can find them easily.

Re: nParticle Stuck and Random Speed

danielecrespini — Sat, 16 Jun 2018 14:00:29 GMT

Hi Sean,

https://www.dropbox.com/s/t9mb0wedirmjaz2/simon%20audio.wav?dl=0

Thank you

Best

Re: nParticle Stuck and Random Speed

sean.heasley — Mon, 18 Jun 2018 15:18:36 GMT

Hi @danielecrespini

There's still no link in that dropbox download. It instead downloaded a .wav file called Simon audio.

Can you please try hosting a link again for the scene file?

Re: nParticle Stuck and Random Speed

danielecrespini — Mon, 18 Jun 2018 22:09:29 GMT

OH, I'm very sorry and thank you for follow my issue

https://www.dropbox.com/s/1rpf6stdu8tiz8s/Nothing%2015.0012.mb?dl=0

Can you see it now?

Thanks

Daniele

Re: nParticle Stuck and Random Speed

mspeer — Tue, 19 Jun 2018 07:59:04 GMT

Hi!

1. If you use forces on your particles you need to vary the mass of particles, but i don't see the need for this, so maybe using the emitter only would be better.

2. I don't see particles stuck but the fps gets down with more particles, so either get better Hardware or reduce particle count.

Re: nParticle Stuck and Random Speed

sean.heasley — Wed, 20 Jun 2018 14:51:50 GMT

Hi @danielecrespini

@mspeer summed it up. I also didn't see any particles stuck so it may be due to your hardware, GPU drivers, or the particle count.

Please let me know if you need any more assistance!

Re: nParticle Stuck and Random Speed

danielecrespini — Sat, 23 Jun 2018 10:39:54 GMT

@mspeer wrote:
Hi!
1. If you use forces on your particles you need to vary the mass of particles, but i don't see the need for this, so maybe using the emitter only would be better.

2. I don't see particles stuck but the fps gets down with more particles, so either get better Hardware or reduce particle count.

Hi, thanx for answering.
1 - how can I use forces only on some particles? What do you mean with "I don't see the need for this"? I need, because I like some particles faster than others.

2 - The weird thing is, they don't get stuck now and I don't remember why...probably I just increased they speed. But if you increase the rate (number of particle for a second), you will see them stacking, nevertheless the speed of the camera seems to be not affected at all. How is possible the the shortage of hardware affect particles speed and not the camera movement?

Thank you

Daniele

Re: nParticle Stuck and Random Speed

danielecrespini — Sat, 23 Jun 2018 10:49:20 GMT

Hi Sean,

At the moment I'm quite happy with the outcome. Probably increasing speed with "Basic emitter speed attributes" helped considerably: I did many attempts and I don't remember now I got it. But it still stuck if I try to increase "Rate (part/sec)". Can you try to do the same and tell me if you get the same outcome please? Also I don't understand why the movement of the camera is affected and why the movement of the camera is not affected.
Does GPU affect such work out? Is not only on the CPU? 2GB graphic card for such simple scene is not enough?

Thanx

Best

Re: nParticle Stuck and Random Speed

mspeer — Sat, 23 Jun 2018 13:44:20 GMT

Hi!

1. You don't need different forces, only one force (like the wind you applied) but different values for mass (per particle).

Why do you need one simple directional force (wind) to move the particles, just emit them and let them fly?

2. Camera speed? I don't see any animated camera in the scene.

If you are talking about tumbling the camera with paused playback, that's of course no problem without the need to calculate dynamics and new positions for millions of particles.

Re: nParticle Stuck and Random Speed

sean.heasley — Mon, 25 Jun 2018 19:10:51 GMT

Hi @danielecrespini

Like @mspeer said, you don't need different forces simply change the mass of the particle(s).

I'm also not seeing any animated camera in the scene.

And yes, Maya does draw a lot from the GPU when working. 2GB is adequate but a more powerful card will obviously grant better results.