Конверсия Instancer’а в геометрию

Type: Python Script (py)
Name: sag_instancerToGeometry
Version: 1.4
Released: 2012.05.05
Download
v1.4
- corrected GUI for older maya versions

v1.3:
- doesn't set visibility to off prior to the starting frame of conversion
- doesn't pay attention to 'start from current frame' if custom range is defined

v1.2:
- reworked GUI
- uses long names correctly (no problems with objects of the same name anymore)
- doesn't freeze source objects' rotations or error if channels have keyframes
- keeps input connections for instances also
- works with different rotation orders of source objects and instancer itself
- each baked object is inside it's own group which actually gets all keyframes
- works with any linear units of the scene (switches to cm and back, actually)

v1.1:
- duplicates now maintain original input connections
- only translate, rotate, scale and visibility are keyframed now

Практически каждый раз когда использую instancer для размножения геометрии по частицам, в итоге неминуемо хочется перевести полученный результат в обычные объекты с ключевой анимацией, дабы подправить отдельные из них или удалить вовсе.

Вот наконец-то собрался и написал утилиту для решения этой задачи.

sag_instancerToGeometry Interface

Использование:

файл sag_instancerToGeometry.py надо положить в любую папку, откуда Maya читает скрипты;
запустить python-скрипт:

from sag_instancerToGeometry import *
sag_instancerToGeometry()

выделить instancer‘ы, которые нужно сконвертировать и нажать Convert в окне утилиты. Будет произведена конвертация, удаление static channels и применен euler filter.

Опции:

Make Duplicates/Instances – в первом случае созданные объекты будут независимыми дубликатами, во втором – инстансами от исходного объекта (который воткнут в instancer);

Start from Current Frame – если включено, вне зависимости от таймлайна или выставленного вручную диапазона фреймов, начнет конвертацию с текущего фрейма;

Playback/Custom Range – в первом случае диапазон фреймов будет взят из таймлайна, во втором – можно ввести значения начального и конечного фрейма;

Convert – [...описание оказалось столь длинным и замороченным, что было удалено редактором...]

Help – линк на эту страницу.

Примечания:

Разумеется, есть ряд ограничений и попросту недоработок… Из тех что могу сейчас отметить:

вращения конвертятся только из канала Rotation instancer‘а, всякие Aim я пока не учитывал и пока даже не знаю буду ли вообще, потому как в принципе наиболее используемую ориентацию объектов по velocity можно легко написать экспрешеном в тот же Rotation, к примеру:

float $vel[] = velocity;
float $ang[] = `angleBetween -euler -v1 1 0 0 -v2 $vel[0] $vel[1] $vel[2]`;
rotPP = <<$ang[0], $ang[1], $ang[2]>>;

если на какой-то из каналов instancer‘а назначен “необычный” атрибут, который не получится прочитать – скрипт работать не будет. На данный момент я не могу себе представить зачем кто-то будет такое делать, хотя в ходе тестов столкнулся с тем, что некто поставил на Scale атрибут Ramp Velocity и тот не читался утилитой. Вероятно могут быть проблемы с какими-то полезными атрибутами, так что тут как раз возможность для апдейтов.
для правильной передачи вращений с учетом разных rotationOrder приходится фризить rotate каналы воткнутых в instancer объектов. Соответственно, если они проанимированы ключами или экспрешеном, или попросту залочены – скрипт завалится. Смысла крутить исходный объект вместо того чтобы крутить как полагается партикловыми экспрешенами лично я не вижу, поэтому этот нюанс тоже не решался.

В общем, пробуйте, пользуйтесь и пишите багРепорты/пожелания – я постараюсь их исправить/добавить.

Several Instancers Converted into Geometry Simultaneously

Posted on November 14, 2009 at 20:37 by Sagroth · Permalink
In: FX · Tagged with: instancer, maya, particles, python, sag_instancerToGeometry, script, tool, utility

27 Responses

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Written by leo369
on 17 November 2009 at 5:44
Permalink

hello,friend,can you send python script to me
mail:yuyu8401936@hotmail.com
Written by Владимир
on 23 November 2009 at 19:33
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Отличная утилита!!!
Written by Dan Shumaker
on 11 June 2010 at 0:14
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I’m getting a “Bad Magic Number” error when trying to import.

Can you send me the script please? dans@floathybrid.com

Thanks.
Written by Sagroth
on 11 June 2010 at 3:23
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I’ve put original .py instead of compiled .pyc, so there should be no issues anymore.

Положил исходный .py вместо скомпилированного .pyc, поэтому проблем больше не должно быть.
Written by Mostafa
on 23 June 2010 at 17:13
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this is awesome man. thanks a lot.
Written by sanctus
on 6 August 2010 at 16:15
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Возможно вас заинтересует http://somesanctus.blogspot.com/2010/08/smartrotation.html
и вы пересмотрите свое отношение к каналам Aim и Up
это – пожелание включить их в утилитую.
Written by Sagroth
on 6 August 2010 at 22:28
Permalink

Да, спасибо. Я в курсе что это нужно и важно, просто пока не успел обдумать как это все конвертить во вращения.
Written by Knekker
on 26 November 2010 at 10:49
Permalink

Whenever i try to source this script I keep getting a // Error: invalid directive // I’ve tried putting the script in every script folder there is in maya. What am i doing wrong? I use maya 2010 btw.
Written by Sagroth
on 26 November 2010 at 11:03
Permalink

Have you tried the latest .py version? I heard old .pyc caused problems on different OSes, so I’ve put .py eventually.
Written by knekker
on 26 November 2010 at 12:01
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Hey thanks for the quick reply, i figured out the problem, In the script editor i forgot to choose the Python menu before loading the script.

Now I have loaded the script with no errors, it seems to have loaded just fine, now my question is… Shouldn’t there apear a GUI box whenever i load this script? cause nothing happens.

Am i missing a step or something? Pardon my noobness, I’ve never loaded a python script before.
Written by knekker
on 26 November 2010 at 12:06
Permalink

Oh I forgot to mention that after i loaded the script I ran the “from sag_instancerToGeometry import *
sag_instancerToGeometry()” lines, and a GUI box apears, but it only contains “Start from Current Frame” button.

We are running linux here at the company, perhaps thats the reason, rest of the GUI is missing?
Written by knekker
on 26 November 2010 at 12:15
Permalink

well I guess you could just delete my posts, I got it to work now for some odd reason. = /

Thanks for the help btw.
Written by knekker
on 26 November 2010 at 12:25
Permalink

This tool is really neat at creating objects that translates along with the instanced objects, my question now is… it is possible for it to simulate the rotation of each instanced object/particle as well?
Written by Sagroth
on 26 November 2010 at 22:56
Permalink

Good that everything is working eventually.

Script bakes rotations, but from ‘Rotation’ channel only – no aims. There’s a mention about that in notes above. So, if you have it mapped – everything should be fine, if you use aims – you should try to convert them into rotations for baking or rotate baked objects afterward.
Written by knekker
on 29 November 2010 at 12:45
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Alright thanks alot for the tip Sagroth, very appreciated.
Written by Yaleh
on 15 December 2010 at 1:58
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Love the script. Thanks for putting it out there!
Written by gardenia
on 28 January 2011 at 21:22
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Your script works beautifully. Thank you so much for making it available. I very often have to create instances on a surface which is the goal of the particles. The instances Aim Direction is connected to Goal World Normal 0 PP so that they get oriented along the surface normal. Is there a way to transfer the instances orientation to the Rotation channel so that your script evaluates it?

Thank you!
Written by Sagroth
on 28 January 2011 at 22:57
Permalink

Yeap, you just need to use your goalWorldNormal0PP instead of velocity in the angleBetween formula I wrote above. And I think goalWorldNormal0PP won’t get generated at birth, so put this script into runtime expression instead of creation.
Written by gardenia
on 31 January 2011 at 19:12
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Thanks so much Sagroth. It works great!!
Written by Daniel
on 28 February 2011 at 15:24
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Thanks a lot, It saved me quite a lot of time today
Written by Malek
on 21 April 2011 at 9:35
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you are a great person!!!
Written by Mitch
on 29 March 2012 at 5:38
Permalink

Thanks a million!
I only needed a single frame baked, but when I checked out multi-frame baking all the frames except the final frame were keyed invisible for each instanced object.
Another anomaly:
On my first attempt, the baked instances didn’t match the Instancer. I found that one of the original meshes didn’t have it’s pivot at the origin. I moved it and centered the pivot, and then it worked.
Very grateful.
Written by Mitch
on 29 March 2012 at 16:21
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A followup on the visibility issue:
When I bake the particleInstancers, a visibility keyframe is added to the original geometry as well as all the baked instances. I’ve checked the geometry, instancers, and particles, and none have keyframes on visibility before I run your script…
Written by Sagroth
on 29 March 2012 at 18:51
Permalink

Thanks for the feedback. I’ve made a lot of improvements to the utility a long time ago already. A pack of issues were solved, maybe some of these as well. I’ve just forgotten to update it here – I’ll try to recheck the issues you’ve mentioned and make an update in a couple of days.
Written by Alin
on 5 April 2012 at 9:58
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thank man, very good script
Written by Gino
on 28 April 2012 at 22:25
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Hi,

I’m testing the script now on a particle instancer… It’s been running for 10+ minutes now but I don’t see anything happing.. is the viewport updated during the process?.. I have 14000 particles on here so I’m thinking it might take a while but… Could you add a progressbar to this?
Heh.. I should have tested this on a simpler Instancer
Written by Sagroth
on 29 April 2012 at 10:48
Permalink

Yeah, 14k seems to be too much