Advances in Computer Graphics, 24th Computer Graphics International Conference, CGI 2006, Hangzhou, China, June 26-28, 2006, Proceedings
Advances in Computer Graphics, 24th Computer Graphics International Conference, CGI 2006, Hangzhou, China, June 26-28, 2006, Proceedings
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计算机图形学进展，第 24 届计算机图形学国际会议，CGI 2006，中国杭州，2006 年 6 月 26-28 日，论文集
DOI：
10.1007/11784203
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
H. Seidel
中科院分区：
文献类型：
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作者：
T. Nishita;Qunsheng Peng;H. Seidel
在本文中，我们认为我们的 NPAR 系统是大多数 NPR 研究的有效 2D 替代方案，这些研究重点关注 3D 模型的帧相干风格化渲染。我们的方法在没有 3D 模型支持的情况下为图像提供了高度风格化的外观，但它们仍然表现得像通过绘图动画一样。首先，使用风格化画笔工具自由地绘制角色的极端姿势。每个字符都是由 2D 绘制的笔触组成，这些笔触被手动分组为图层。每个图层都在绘图层次结构中分配了自己的位置，称为层次显示模型 (HDM)。接下来，为同一个角色创建多个HDM，每个HDM对应一个特定的视图。 HDM 集合实质上将一些对应信息重新引入到中间所需的 2D 绘图中，并且实际上消除了对真正 3D 模型的需要。模型组成后，动画师开始及时定义来自极端姿势的关键帧。接下来，由关键帧 HDM 定义的笔触轨迹会自动跨过中间帧。最后，遍历每个生成的中间帧的每个 HDM，并将所有元素从后到前依次绘制。我们的技术支持高度渲染的样式，这些样式特别难以通过传统方式制作动画，包括“喷枪”、刮板、水彩、水粉、“水墨”和“蜡笔”样式。我们相信我们的系统为计算机辅助动画制作和相关工具提供了一种全新的视角。
In this paper we argue for our NPAR system as an effective 2D alternative to most of NPR research which is focused on frame coherent stylised rendering of 3D models. Our approach gives a highly stylised look to images without the support of 3D models, and yet they still behave as though animated by drawing, which they are.First, a stylised brush tool is used to freely draw extreme poses of characters. Each character is built up of 2D drawn brush strokes which are manually grouped into layers. Each layer is assigned its place in a drawing hierarchy called a Hierarchical Display Model (HDM). Next, multiple HDMs are created for the same character, each corresponding to a specific view. A collection of HDMs essentially reintroduces some correspondence information to the 2D drawings needed for in-betweening and, in effect, eliminates the need for a true 3D model.Once the models are composed the animator starts by defining keyframes from extreme poses in time. Next, brush stroke trajectories defined by the keyframe HDMs are in-betweened automatically across intermediate frames. Finally, each HDM of each generated in-between frame is traversed and all elements are drawn one on another from back to front.Our techniques support highly rendered styles which are particularly difficult to animate by traditional means including the ‘airbrushed’, scraperboard, watercolour, Gouache, ‘ink-wash’, and the ‘crayon’ styles.We believe our system offers a new fresh perspective on computer aided animation production and associated tools.