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本文是一篇關于Arnold渲染器渲染動畫廣告片的幕后分解。文章展示了這個短片的廣告頭發制作和渲染。

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

制作過程的制作視頻教學解說：

上一篇制作過程的解析教學：https://www.aboutcg.com/14361.html

完整的視頻短片

The IGA campain features anywhere from 3 to 16 characters per spot. All these CG actors need to drop by the virtual hair salon before they are allowed on set. Here’s what happened to Oceane Rabais and Bella Marinada at this stage.

1-We always start with the character design made here at SHED as a reference.

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1我們總是渲染渲染先從角色設計作為參考。

2 – We then look up on the internet for a real life reference of what the hairdo could look like. This is only as a reference to capture certain real life details. Since we are going for a Cartoonish look, we are not aiming at reproducing the reference exactly. Of course a picture of a duckface girl is always a plus.
2 -然后我們在互聯網上查找現實生活中的參考。這只是制作為了作為一個參考某些真實的生活的細節。因為是卡通角色，所以也不能完全照搬，當然女孩首先是要苗條。

3 – We proceed to create an emitter fitted to the head from which we emit guide strands with Ice. They get their shape from nurbs surfaces. Those guides are low in number (from 200 to 400), so it’s easy to work with them to groom and later simulate and cache on disk. The idea is to get the shape of the hairstyle and the length. The bright colors are there to help see what’s going on.

3 -我們繼續在頭部創建發射器使用ICE引導。然后從Nurbs獲得模型物體。引導的精度很低從200 到400 ),所以很容易計算。這個想法是為了得到發型的形狀和長度。明亮的顏色有幫助看到發生了什么。

4 – Next, we clone theses strands, add an offset to their position and apply a few Ice nodes to further the styling. These nodes generally include randomizing and clumping amongst others. We now have around 90 000 strands and it can go up to 200 000.
4,接下來,我們克隆這些引導，添加一些位置的調整和ice節點來體現發型效果。這些節點一般包括隨機化和阻尼效果。我們現在有大約90 000股引導和它能上升到200000。

5 – Then we repeat the process with the eyelashes and the eyebrows. During the whole process the look is tweaked in a fast rendering scene.

5 -然后我們重復這個過程，得到睫毛和眉毛。整個過程中外觀是調整在一個快速的渲染場景。

6 – Once happy with the results, we copy the point clouds and emitters to the “render model” where the point clouds will be awaiting an Icecache for the corresponding shot. We use Alembic to transfer animation from rig to render model and the Ice emitters .
6 -一旦結果滿意,我們復制點云和發射器的“渲染模式”,點云會等待一個Icec緩存。我們用Alembic傳輸動畫到ice發射器。

7 – Back to the Hair model we convert the guides strands to mesh geometries. We apply syflex cloth simulation operators to these geometries to get ready for shot simulation. We link the guide strands to the syflex mesh so they inherit the simulation.
7 -我們把頭發引導轉化成模型。再使用syflex布模擬頭發動力學。

8 – Next comes shot by shot simulation and Ice caching of the guides strands (hair, lashes, eyebrows and beard if necessary).
8 -接下來模擬和緩存ICE的引導線(頭發、睫毛、眉毛和胡子如果必要)。

9 – Before we pass down the simulation caches to the rendering department, we need to do a test render to be sure every frame works and there is no glitch/pop. With final beauty renderings taking sometimes close to 2 hours per frame, it is not a good thing to have to re-render a shot because a hair strand is out of place ! The scene we use renders quickly with no complex shaders and only direct lighting.
9 -在緩存結算渲染之前，我們會做些測試渲染來保證所有東西的沒問題。以最后的美麗圖片以接近2小時每幀的速度渲染,如果因為頭發穿插而重新渲染就太糟糕了，下面就是測試渲染。

10 – Once we are happy with the look of the hair, the movement of the simulation AND most of all once we’ve resolved all the problems, we give the signal to the rendering department. The hair PointClouds are always automatically linked to the appropriate simulation cache for the current shot so all they have to do is “unhide” the corresponding object in their scene and voila !
10 -一旦我們滿意，就開始渲染一個單幀來看最終效果。頭發的PointClouds結算緩存會自動連接到緩存上，最后即渲染啦不拉不拉。