A user interface for interactive cinematic shadow design

F. Pellacini, P. Tole, D. Greenberg
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引用次数: 90

Abstract

Placing shadows is difficult task since shadows depend on the relative positions of lights and objects in an unintuitive manner. To simplify the task of the modeler, we present a user interface for designing shadows in 3d environments. In our interface, shadows are treated as first-class modeling primitives just like objects and lights. To transform a shadow, the user can simply move, rescale or rotate the shadow as if it was a 2d object on the scene's surfaces.When the user transforms a shadow, the system moves lights or objects in the scene as required and updates the shadows in realtime during mouse movement. To facilitate interaction, the user can also specify constraints that the shadows must obey, such as never casting a shadow on the face of a character. These constraints are then verified in real-time, limiting mouse movement when necessary. We also integrate in our interface fake shadows typically used in computer animation. This allows the user to draw shadowed and non-shadowed regions directly on surfaces in the scene.
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交互式电影阴影设计的用户界面
放置阴影是一项困难的任务,因为阴影以一种不直观的方式依赖于光和物体的相对位置。为了简化建模器的任务,我们提出了一个在3d环境中设计阴影的用户界面。在我们的界面中,阴影被当作一级建模原语,就像物体和灯光一样。要变换阴影,用户可以简单地移动、缩放或旋转阴影,就好像它是场景表面上的2d对象一样。当用户变换阴影时,系统会根据需要移动场景中的灯光或物体,并在鼠标移动时实时更新阴影。为了促进交互,用户还可以指定阴影必须遵守的约束,例如永远不要在角色的脸上投射阴影。然后实时验证这些约束,在必要时限制鼠标移动。我们还在我们的界面中集成了通常用于计算机动画的假阴影。这允许用户直接在场景中的表面上绘制阴影和非阴影区域。
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Session details: 3D acquisition and image based rendering Session details: Geometry Session details: Soft things Session details: Lighting and appearance Session details: Images and video
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