Maya nParticle only calculates friction/stickness between particles and rigid bodies, not friction is encountered between particles. My guess is the algorithm complexity is too high. Anyway there is two relative easy ways to fake the effect, according to my searching.
想要用一个一包糖粒堆在物体（对又是它..）上的片段，发现Maya的nParticle只计算粒子和Rigid body的摩擦力不计算粒子和粒子间的摩擦力（想来是算法复杂度太高了），所以不管怎么搞最终都会摊成大烧饼，并且还会不停的抽搐.. 查了下大概有两个相对简单的方法
1. hold particles with a invisible rigid body. 2. Use RealFlow, which seems to have much more handy control over particles
I’m not happy with either. 1 is lame. 2 too much trouble, have to get hang of another environment. If I must do scripting, I choose to learn mel.
So the algorithm is:
It’s unlikely to mess with friction as I guessed above. I tried to modify per particle mass to let them stuck in the space. Yea that works but they tend to be headbutted by other particles and flying around.. for science. Later I googled out it’s possible to control force field per particle, with attribute named “Field name”_”option name”. That is to say adding attribute “gravityField1_magnitude” to nParticle2 will grant you control over per particle gravity from the field.
On creation:
[php]
global int $freezeCap=5; //be completely frozen after the cap rounds
global int $gravityPP=500;
global float $dragPP=100;
global float $accelerationTrigger=15; //the speed parameter to trigger ‘I’m free again!", which leads to free droping.
global int $n[100000]; //how many times have the particle been locked
global int $preVel[100000]; //velocity of last frame
global int $locked[100000];
nParticleShape4.dragField1_magnitude=0;
nParticleShape4.gravityField1_magnitude=$gravityPP;
global int $init=1;
if($init==1) {
int $i;
for($i=0;$i<100000;$i++) {
$n[$i]=0;
$locked[$i]=0;
}
$init=0;
}
[/php]
Before dynamics:
[php]
int $id=nParticleShape4.particleId;
float $vel=abs(nParticleShape4.velocity);
//print("nParticleShape2.velocity "+$nParticleShape2.velocity+"\n");
if($vel>$preVel[$id]+$accelerationTrigger) {
$n[$id]=0;
nParticleShape4.dragField1_magnitude=0; //If it’s free again, unlock and erase record
}
else {
$freezeFact=$n[$id]/$freezeCap; //progress bar of locking
if($freezeFact>1)
$freezeFact=1;
$n[$id]+=1;
nParticleShape4.dragField1_magnitude=$freezeFact*$dragPP; //increase drag force depending on locking level
nParticleShape4.gravityField1_magnitude=$gravityPP*(1-$freezeFact)*(1-$freezeFact); //parabola is better according to experiment
nParticleShape4.velocity=<<0,0,0>>;
}
$preVel[$id]=nParticleShape4.velocity;
[/php]
The script is not bad to me.. adjustable parameters are handy. Time efficiency is acceptable (as a former ACMer, I can confirm this is O(n), can’t be better). 20 million particles * 100 frames cost my i7 half an hour. Not perfect but enough for bragging.
1. 弄个透明的动画的rigid body来把粒子圈起来。 2. 用RealFlow，我只用RealFlow模拟水，但是显然那它对粒子的控制比Maya厉害得多。
两个方法我都不高兴，1太不屌爆，2太麻烦，要做很多熟悉另一个环境的工作，且要写脚本，所以不如来学下mel。下了本书叫Maya Python — for Games and Film，翻了一百页发现Python在Maya上基本是庞大的workflow中工程师为了其他人方便写的maya程序，并且也要有mel基础，不是我要的。
总之，思路是：
想要计算摩擦力显然是不现实的，说过了。我先通过改质量的途径让粒子满足条件时失去质量以停在原地不受重力影响，停是能停住但是会被别的particle撞飞.. 非常科学。后来查到可以使用 <力场名>_<属性名> 的方式控制Per Particle的行为，即，给nParticle2添加名为gravityField1_magnitude的attribute程序就会使用它来控制它受到重力场1的magnitude。然后通过DragField让particle稳定。我在注释里详细说。
粒子生成时脚本：
[php]
global int $freezeCap=5; //be completely frozen after the cap rounds
global int $gravityPP=500;
global float $dragPP=100;
global float $accelerationTrigger=15; //the speed parameter to trigger ‘I’m free again!", which leads to free droping.
global int $n[100000]; //how many times have the particle been locked
global int $preVel[100000]; //velocity of last frame
global int $locked[100000];
nParticleShape4.dragField1_magnitude=0;
nParticleShape4.gravityField1_magnitude=$gravityPP;
global int $init=1;
if($init==1) {
int $i;
for($i=0;$i<100000;$i++) {
$n[$i]=0;
$locked[$i]=0;
}
$init=0;
}
[/php]
动态前的脚本：
[php]
int $id=nParticleShape4.particleId;
float $vel=abs(nParticleShape4.velocity);
//print("nParticleShape2.velocity "+$nParticleShape2.velocity+"\n");
if($vel>$preVel[$id]+$accelerationTrigger) {
$n[$id]=0;
nParticleShape4.dragField1_magnitude=0; //If it’s free again, unlock and erase record
}
else {
$freezeFact=$n[$id]/$freezeCap; //progress bar of locking
if($freezeFact>1)
$freezeFact=1;
$n[$id]+=1;
nParticleShape4.dragField1_magnitude=$freezeFact*$dragPP; //increase drag force depending on locking level
nParticleShape4.gravityField1_magnitude=$gravityPP*(1-$freezeFact)*(1-$freezeFact); //parabola is better according to experiment
nParticleShape4.velocity=<<0,0,0>>;
}
$preVel[$id]=nParticleShape4.velocity;
[/php]
个人感觉这个还不错，有很多参数可以控制，效率也还行（前ACMer表示这个就是O(n)..不能再低了），200万粒子100帧i7跑半个小时。显然不完美，蒙人没问题。
Hello! Do you use Twitter? I’d like to follow you if that would be ok.
I’m definitely enjoying your blog and look forward to new
posts.
At this moment I am going to do my breakfast, after having
my breakfast coming again to read more news.
Hi there this is somewhat of off topic but I was
wanting to know if blogs use WYSIWYG editors or if you have to manually
code with HTML. I’m starting a blog soon but have no coding skills so I wanted to get advice from
someone with experience. Any help would be enormously appreciated!
Having read this I believed it was very enlightening.
I appreciate you taking the time and energy to put this
article together. I once again find myself spending a lot of time both reading and
leaving comments. But so what, it was still
worthwhile!
Interesting blog! Is your theme custom made or did you download it from somewhere?
A design like yours with a few simple tweeks would really make my blog jump out.
Please let me know where you got your design. Cheers
Hi! I could have sworn I’ve been to this blog before but after reading through some of the post I realized it’s new to me.
Anyhow, I’m definitely delighted I found it and I’ll be book-marking and checking back frequently!
You really make it seem so easy with your presentation but I
find this topic to be really something that I think I
would never understand. It seems too complex and extremely broad for me.
I’m looking forward for your next post, I will try to get the hang of it!
Hey there! This post couldn’t be written any better!
Reading this post reminds me of my previous room mate!
He always kept chatting about this. I will forward this
post to him. Pretty sure he will have a good read. Thanks for sharing!
Wow, this article is fastidious, my younger sister
is analyzing such things, thus I am going to convey her.
Magnificent beat ! I wish to apprentice while you amend your site, how could i
subscribe for a blog website? The account aided me a acceptable deal.
I had been tiny bit acquainted of this your broadcast provided bright clear idea
Hi there would you mind sharing which blog platform you’re
using? I’m looking to start my own blog soon but I’m having a difficult
time making a decision between BlogEngine/Wordpress/B2evolution and Drupal.
The reason I ask is because your design and style seems
different then most blogs and I’m looking for something unique.
P.S My apologies for being off-topic but I had to ask!
Hi, i believe that i noticed you visited my website so i came to return the want?.I’m attempting to find things to enhance my site!I guess its good enough
to use a few of your ideas!!
Ciekawy wpis. Dużo przydatnych inspiracji. Dzięki że dzielisz się wiedzą.
Polecam innym.
Dokładnie – kwestia doboru mebli bywa niełatwa.
Dobrze, że ktoś to wyjaśnia.
Szczerze pomocne. Szukałem podobnych porad już jakiś czas.
Dziękuję!
Here is my homepage :: Flossie
I never imagined that I would end up divorced. For years I built my career,
believing that everything was fine. Then one day I discovered that my wife
was involved with someone else. What hurt the most was that he had a lot of money.
My world fell apart.
The separation was emotionally exhausting. I spent countless nights awake.
At first I blamed myself. I worried about starting over.
But eventually I understood the truth: my future depended on me.
Instead of living in the past, I became determined to rebuild
my life. I started studying investing. Every day
I learned about asset allocation, blockchain technology,
and wealth preservation.
Eventually I found Paybis and it changed my routine. What stood out immediately was how simple the platform felt.
Managing digital assets became surprisingly efficient.
These days I rely on Paybis for converting digital assets
into traditional currency. Everything is easy to follow.
I can track transactions while maintaining
better financial organization.
The fintech side fascinated me. Learning about blockchain settlements gave me a new perspective on money.
I analyzed trends. Gradually I became more confident with my
decisions.
Then something unexpected happened. As my finances improved, I realized that the problem was never financial.
The real issue was attitude. No amount of money can fix that.
Things changed when I least expected it. A new relationship entered my life.
She was younger than my ex. What mattered most she was encouraging and respectful.
Today I feel stronger than ever. That period of
my life is finished. I regained confidence, improved my future, and found a new beginning.
In hindsight, I don’t hold onto bitterness.
I respect the journey. The worst moment became a turning point.
My financial journey reminds me how much I have grown. The emotions are incredible—relief,
excitement, confidence, and gratitude all at once.
Hi, I do believe this is an excellent web
site. I stumbledupon it 😉 I am going to come back once again since i have saved as a favorite it.
Money and freedom is the greatest way to change,
may you be rich and continue to help other people.
Hi there, just wanted to say, I loved this article. It was helpful.
Keep on posting!
I have read so many articles or reviews on the topic of the blogger lovers but this post is in fact a pleasant article,
keep it up.
It’s going to be end of mine day, but before end I am reading this enormous post to increase my experience.
The caring atmosphere ɑt OMT encourages interest in mathematics,
turning Singapore students іnto passionate learners inspired tо achieve tߋp exam outcomes.
Dive іnto self-paced math proficiency ѡith OMT’s 12-month e-learning courses, tοtal wіth practice worksheets аnd tape-recorded sessions fօr comprehensive
modification.
Αs mathematics forms tһе bedrock of abstract thought ɑnd critical problem-solving in Singapore’ѕ education system, expert math tuition supplies tһe customized assistance necessary to tuｒn difficulties іnto victories.
Tuition іn primary school mathematics іs essential fοr PSLE preparation, аs it introduces
advanced methods fоr dealing with non-routine pгoblems that
stump numerous prospects.
Secondary math tuition lays а strong groundwork fօr post-O Level researches,
ѕuch aѕ A Levels оr polytechnic courses, Ьʏ excelling in foundational subjects.
Βy supplying extensive experiment pɑѕt A Level examination documents,
math tuition acquaints trainees ᴡith concern layouts
ɑnd noting systems fօr ideal efficiency.
By integrating exclusive strategies ᴡith the MOE curriculum, OMT supplies аan unique method tbat stresses clearness аnd deepness in mathematical thinking.
Gamified elements mɑke revision enjoyable lor, encouraging mⲟre teschnique andd causing quality renovations.
Singapore’ѕ concentrate on all natural education іѕ matched by math
tuition that constructs sеnsible reasoning fօr lifelong test advantages.
Taқe a loοk аt my web site; math tuition jc
создание стендов производство стендов для выставки
Good cleaning can help save time.
This applies to offices where maintenance matters.
One example in this field is reinigungs-profies.de.
Pretty! This has been an incredibly wonderful article.
Thank you for supplying this info.
Rzeczowy artykuł. Wiele wartościowych wskazówek.
Pozdrawiam za podzielenie się. Czekam na więcej.
Trafnie napisane – sprawa doboru mebli potrafi
być niełatwa. Przydatne podejście.
Naprawdę przydatne. Szukałem czegoś takiego już jakiś czas.
Dziękuję!
Feel free to surf to my web site: https://www.arurumusicschool.com
I do accept as true with all of the ideas you’ve offered on your post.
They are really convincing and will certainly work.
Still, the posts are too rief for newbies. Could you lease lengthen them a bit from subseequent time?
Thank you for the post.
Also visit my blog post – ปั้มผู้ติดตาม Twitter
Greetings I am so glad I found your webpage, I really found you by mistake, while I was researching on Digg for something else, Anyways I am here now and would just like to say thanks a lot
for a tremendous post and a all round thrilling blog (I also love the theme/design), I don’t have time to browse
it all at the minute but I have bookmarked it and also added your RSS feeds, so when I have time I will be back to read a great deal more, Please do keep up the great work.
английский [url=www.nmosktoday.ru/news/business/105699/]английский[/url]
Having read this I thought it was rather enlightening. I appreciate you taking the
time and energy to put this content together. I once again find myself spending
a significant amount of time both reading and posting comments.
But so what, it was still worthwhile!
Does your site have a contact page? I’m having trouble locating it
but, I’d like to shoot you an e-mail. I’ve got some suggestions for your blog you might be interested in hearing.
Either way, great blog and I look forward to seeing it
develop over time.
Cabinet IQ
8305 State Hwy 71 #110, Austin,
TX 78735, United Stateѕ
254-275-5536
website
Сил уже нет, человек просто не просыхает. Что делать — непонятно. Проверенный вариант — срочный вывод из запоя без лишних вопросов. Не шарлатаны какие-то. Короче, смотрите сами по ссылке — вывод из запоя круглосуточно [url=https://vyvod-iz-zapoya-na-domu-voronezh-bvc.ru]вывод из запоя круглосуточно[/url] Каждая пьянка минус ресурс. Сам через это прошел, чем хоронить близкого. Очень советую эту контору.
Zdravo, ljudje. Že dolgo sem iskal resnično rešitev. Ko gre za odvajanje od alkohola — veliko ljudi se muči v tišini. Prijatelj mi je svetoval en center, kjer res vedo, kaj delajo. Govorim o Dr Vorobjev centru. Vse podrobnosti in izkušnje drugih ljudi najdete tukaj: zdravljenje alkoholizma [url=https://www.alkoholizem-zdravljenje.com]zdravljenje alkoholizma[/url] Najboljša odločitev, kar sem jih kdaj sprejel. Odvisnost od alkohola je bolezen, ne sramota. Ampak ko vidiš, da nisi sam — upanje se vrne. Vsekakor priporočam vsem, ki se spopadajo s to težavo. Ne obupajte!
Да уж, соседи уже устали слушать эти крики. Как есть — нужен нормальный вывод из запоя на дому. Ребята работают чисто. Короче говоря, вот нормальный расклад — откапаться на дому [url=https://vyvod-iz-zapoya-na-domu-voronezh-xrt.ru]https://vyvod-iz-zapoya-na-domu-voronezh-xrt.ru[/url] Хватит надеяться на авось. Лучше один раз дернуться, чем труп из квартиры выносить. Рекомендую эту наркологическую клинику.
Dolga leta sem se boril sam. Potem pa sem dobil pravi nasvet in vse se je spremenilo. Govorim o ambulantnem zdravljenju alkoholizma pri strokovnjakih, ki res znajo pomagati. Veste, ni lahko, ampak se da premagati. In kar je najpomembneje – ni treba v bolnišnico. Več o tem in o izkušnjah pacientov si lahko preberete neposredno na uradnem viru: zdravljenje alkoholizma [url=zdravljenjealkoholizma.com]zdravljenje alkoholizma[/url]. Meni so resnično pomagali.
Če nekdo v vaši okolici potrebuje pomoč – ne odlašajte. Vse se da, če hočeš.
長らく探していた素晴らしいサイトに巡り合えました。デザインのバリエーションが非常に豊富で、各アイテム独自の雰囲気と魅力が溢れています。細部の作り込みが丁寧で、素材感やシルエットの美しさに非常に感動しました。
様々なコンセプトのアイテムが取り揃えられており、シチュエーションや好みに応じて選択できる幅が広いです。単なるデザインだけでなく、着用時の心地よさもしっかり考慮されている点が非常に好印象です。
仕立ての良さが安定しており、どの商品を見ても満足できる水準です。オリジナリティ溢れるデザインが多く、他サイトにはない魅力的なラインナップが最大の特徴だと感じます。
機会があれば継続して利用したいと強く思います。新商品の追加も楽しみで、知り合いにも自信を持っておすすめできる素晴らしいショップです。
I’m gone to inform my little brother, that he should also go to see this webpage on regular
basis to take updated from newest gossip.
I never imagined that my relationship would collapse. For years I worked hard,
thinking that everything was fine. Then to my shock I discovered that my wife
had been seeing another man. What hurt the most
was that he had a lot of money. My world fell apart.
The separation was emotionally exhausting. Many evenings felt endless.
I wondered what I had done wrong. I worried about my finances.
But eventually I understood the truth: life was not
over.
Rather than staying bitter, I became obsessed with financial education. I explored
modern fintech solutions. Week after week I learned about portfolio diversification,
blockchain technology, and wealth preservation.
One of the most useful tools I discovered was Paybis. What impressed me first
was how simple the platform felt. Handling transactions became far more convenient.
I regularly use Paybis for crypto-to-fiat transactions.
The transaction flow is smooth. I can monitor
my transfers while maintaining control over my assets.
What really interested me was the technology. Learning about blockchain settlements gave me valuable knowledge.
I studied market cycles. Over time I became more
confident with my decisions.
Then something unexpected happened. As I rebuilt my life, I realized that wealth was not what determined happiness.
The real problem was respect. No amount
of money can fix that.
Things changed when I least expected it.
I eventually met someone new. She brought fresh energy into my life.
What mattered most she was encouraging and respectful.
These days I wake up grateful. The difficult chapter is over.
I rebuilt my finances, learned valuable lessons, and found peace of mind.
Looking back, I don’t hold onto bitterness. I value what I learned.
What felt like the end became a new beginning. My financial journey
reminds me how much I have grown. The feeling is amazing—the realization that life can improve dramatically
when you refuse to quit.
Wonderful post but I was wondering if you could
write a litte more on this topic? I’d be very grateful if you could elaborate a little bit further.
Thanks!
Представьте ситуацию, многие не знают как быть. Ситуация аховая. В этом вопросе очень важно не заниматься самодеятельностью. Я нарыл инфу — вывод из запоя на дому. Ребята реально шарят. Если честно, вся инфа тут — вывод из запоя цены воронеж [url=https://vyvod-iz-zapoya-na-domu-voronezh-kmp.ru]https://vyvod-iz-zapoya-na-domu-voronezh-kmp.ru[/url] Промедление смерти подобно, так как запой убивает почки и сердце. Настоятельно рекомендую.
Wonderful work! This is the type of information that should be shared across the web.
Disgrace on the search engines for no longer positioning this post higher!
Come on over and discuss with my website . Thank you =)
An outstanding share! I have just forwarded this onto a co-worker
who was conducting a little homework on this. And he actually ordered me breakfast
because I discovered it for him… lol. So let me reword this….
Thank YOU for the meal!! But yeah, thanks for spending time to discuss this subject here on your site.
Informative article, exactly what I needed.
Že kar nekaj časa spremljam to temo. Ko sem prvič slišal za odvajanje od alkohola po metodi Dr Vorobjev centra, sem bil neveren. Ampak ko sem prebral izkušnje anderen — moje mnenje se je obrnilo. Odvisnost od alkohola je strašna bolezen. In najhuje je, da ljudje se sramujejo prositi za pomoč. Zato vam želim pokazati vse tehnične podrobnosti in uradne informacije, ki so na voljo na tej povezavi: odvisnost od alkohol [url=https://alkoholizma-zdravljenje-si.com]odvisnost od alkohol[/url]. Na tej povezavi so odgovori na vsa vprašanja.
Meni je ta pristop pomagal. Če vas to zanima — ne odlašajte. Upam, da vam bo koristilo!
I’m not that much of a internet reader to be honest but your sites really nice, keep
it up! I’ll go ahead and bookmark your website to come back later
on. Many thanks
저처럼 출장이 많아서 포항출장마사지를 자주 이용하는데,
이 글에서 좋은 정보를 확인했어요.
포항마사지 업체마다 분위기가 차이가 이렇게 큰 줄 몰랐네요.
다음에 포항힐링마사지를 이용할 때
이 정보를 활용할게요.
덕분에 좋은 선택 했어요!
강력 추천합니다!
Have a look at my web blog – 포항킹덤안마
I every time used to study piece of writing in news papers
but now as I am a user of web so from now I am using net for articles, thanks
to web.
изготовление выставочных стендов москва изготовление выставочных стендов
Thanks for your marvelous posting! I quite enjoyed reading it,
you might be a great author.I will ensure that I bookmark your blog
and definitely will come back down the road. I want to encourage yourself to continue
your great job, have a nice afternoon!
Sachlicher Inhalt. Reichlich praktische Inspirationen. Danke für diesen Inhalt.
Ab jetzt lese ich hier öfter mit.
Treffend formuliert – der Bereich des Wohnstils ist anspruchsvoll.
Danke für die klare Erklärung.
Sehr inspirierend. Ich suche schon nach solchen Informationen genau danach gesucht.
Danke!
Also visit my homepage :: Addie
Bardzo dobry artykuł. Mnóstwo praktycznych wskazówek.
Pozdrawiam za ten materiał. Na pewno tu wrócę.
Zgadzam się – sprawa aranżacji bywa wymagająca.
Przydatne podejście.
Naprawdę pomocne. Szukałam podobnych porad właśnie tego.
Pozdrawiam!
my web site: https://azbongda.Com/index.php/jak_zařídit_pokoj_pro_teenagera,_aby_Ho_miloval_a_vy_jste_nezblbli
Simply wish to say your article is as surprising. The clarity for your put up is simply cool
and i could assume you are knowledgeable in this
subject. Well along with your permission let me to clutch your RSS feed to keep updated with drawing close post.
Thank you a million and please carry on the rewarding work.