Arnold 渲染器渲染动画流程和制作解析

本文是一篇关于Arnold渲染器渲染动画广告片的幕后分解。文章展示了场景的设置和渲染。

*注：arnold（阿诺德）渲染器是在maya和XSI平台下的最新超级渲染器，目前被广泛的适用于电影渲染中，其最大的特点就是物理算法，计算速度快，效率高，设置简单。

原文地址：http://shedmtl.blogspot.ca/
翻译：zivix（ABOUTCG)

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For this we had to create a huge library filled with characters that suggest different idea to the client.
对于这一点,我们必须创建一个巨大的图书馆充,类似一个能反馈想法的客户端。

Here’s some behind-the-scenes!
这里是一些幕后!

View the final in english here:
查看最后的视频

Layout

This was a great opportunity to revisit our favorite section of the IGA store (Fruits & Vegetables). We went back to the previous campaign and retrieve all our asset. The biggest part of the job was to re-update all the shaders since the assets were getting old and dusty!
这个教学一个很好的机会重新审视我们的最喜欢的部分的IGA商店(水果和蔬菜)。我们回到了以往的时光。最大的工作的一部分是如何体现旧的和积灰的效果!

We created this section so camera could basically film in any direction without having to rethink the assets. That way, we could reuse the same layout in the two IGA commercials.
我们在这个场景，让摄像机可从任何地方渲染，这样我们就不用再重新制作特定的关联场景了，这样一来，我们还可以在将来在其他的IGA广告中重复使用这个文件。

The library section was definitely more tricky. In the end, with all the bookshelves, it contained more than 30 000 objects. We proceeded to split it in different floors so we could easily manage each “character setup” of the sequence. As for the books, we used an ICE setup to populate the bookshelves.
图书馆的部分绝对是更棘手的。最后,所有的书架,它包含超过30 000个对象。我们把它放在不同的楼层,这样我们就可以轻松地管理每一个“角色设置”的序列。至于书,我们用一个ICE粒子置填充书架。

When the layout was done, it was exported as an Arnold standin (.ASS) so the render scene wouldn’t get heavy. That way, our lighting artist could position the lights based on a lowres mesh of the scene, and the the high res object would be processed only at rendering.

You can see here the result of some of our dailies internal comments after a basic lighting setup was built to put the modelling in context.

当布局之后,我们会输出成arnold渲染器的ASS（屁眼）格式，所以文件不会很大。这样,我们的照明艺术家可以使用低精度的模型打光,高精度的模型只会在渲染的时候被处理。

你可以在这里看到我们工作组内部在渲染的时候所做的渲染标记。

Then of course came the shading of the environment, here’s some quick shading wip:
然后当然就是环境的材质设置，这是当时的制作过程图：

Animation:
动画
As usual, here are all our animation step:
动画的制作过程演示短片

Lighting:
照明:
Our lighting pipeline goes like this. Instead of beginning by lighting characters, we first light the environment, and go through all the pipeline with it (lighting, render, comp). There is several good reason for this. To name a few: our environment renders are way longer to render than our characters so it’s good to start them as early as possible in the production and once we know the look of the background we can more easily light the characters.
我们的照明流程是这样的。我们首先照明环境而不是角色，,并通所有流程都是如此(照明,渲染,合成)。有几个很好的原因。比如，我们的场景渲染会比角色渲染更花时间，所以最好能尽快使得场景渲染能进入日程，一旦我们看到了环境的渲染结果，我们会更容易使得角色的渲染能匹配环境。

Here’s a small breakdown of the first shot of the commercial:
这是广告中的一个小分解:

Some Work In Progress of the environments Lighting:
环境照明的制作流程

Arnold render didn’t support IES lights files, so we created our own
gobo filters to create a similar look
Arnold渲染器不支持IES光域网，所以我们使用gobo（灯光滤镜-译者注）来创建类似的效果。

Some work in progress and final frames of the characters lighting
角色灯光照明流程
As you can see, we put the environment look dev. in rotoscopy while we light the characters so we can get a quick visual representation of the final look of the shot
正如您可以看到的,我们进入环境look dev（Lookdev = look development.，表示匹配材质贴图设置流程 – 译者注）然后我们可以快速的设置最终的角色渲染效果。

And of course, some fun technical failure
当然，技术分解如下

This spot was also tricky because of the number of characters. We had to create 14 characters. Of course some of them are seen in the background and doesn’t need to be as polished as the main ones, but even removing those, we had 6 characters seen in close up. That means that all those character also needed proper hair grooming and simulation. In a couple of days, we will have a post about our Hair creation pipeline. So stay tuned.
这个地方也很棘手,因为角色的数量很多。我们必须创建14个角色。当然有些是背景中的,不需要打磨成主角那样复杂,但即使删除这些,我们仍然有6个主要的角色。这意味着所有这些角色也需要适当的头发梳理和仿真。过几天,将有一篇关于我们的头发创建流程视频。所以请继续关注。

Some final Full resolution (2538×1080) frames (click on the thumbnail, then open full size image in a new tab to see the real resolution) :
一些最后的全分辨率(2538 x1080)帧(点击缩略图,然后打开全尺寸图像在新标签页看到真正的分辨率):

I hope you liked this behind-the-scenes! We definitely loved working on this commercial! Again, keep checking the blog because in a few days we’ll do a post about our Hair pipeline!

我希望你喜欢这幕后!我们很喜欢这个个ion工作,保持检查我们的网站因为在几天之内,我们将做一篇关于我们的头发流程讲解!