EAGER: Exploratory Research in Creative Sketching for 3D Design

素描在创意设计中起着重要的作用。计算机辅助草图绘制的早期尝试覆盖了用于3D建模的CAD方法上的草图绘制界面。这种方法在快速传达已经充分设想的设计方面取得了成功，但在早期概念设计中存在问题。CAD中的基本要求是始终存在底层一致的3D实体表示。需要一致的3D模型是早期概念设计的一个障碍。几何形状必须是受约束的或自动生成的，而无需设计人员的输入。在早期的概念阶段，设计师需要自由地试验不完整的和可能不一致的视图和细节。早期的工作表明，可以仅使用附加到放置在3D空间中的2D平面的笔划来执行3D设计和分析。这项研究扩展了自由形式的范例，通过试验额外的草图图元和相互作用。基础3D笔划系统将用作起点。将添加用于选择和显示附加元素的技术，例如图像、3D片段和2.5D表面表示。该项目的智力价值是改变了CAD系统的性质，通过将草图和概念合并到3D模型上，而无需使模型保持一致，直到设计师准备好实施一致性，从而更好地支持概念设计。该项目更广泛的影响是开发与早期概念和创意设计师相关的草图和CAD工具。

Sketching plays an important role in creative design. Early attempts at computer-aided sketching overlay a sketching interface on a CAD approach for 3D modeling. This approach has been successful in quickly communicating designs that have already been fully envisioned, but is problematic in early conceptual design. Fundamental in CAD is the requirement that there is always an underlying consistent 3D solid representation. Requiring a consistent 3D model is an impediment to early conceptual design. Geometric forms must be either constrained or generated automatically without the designer's input. In the early conceptual phase the designer needs the freedom to experiment with incomplete and possibly inconsistent views and details. Early work has shown that 3D design and analysis can be performed using only strokes attached to 2D planes placed in 3D space. This research extends the free-form paradigm by experimenting with additional sketch primitives and interactions. The base 3D stroke system will be used as a starting point. Techniques for selecting and displaying additional elements, such as images, 3D fragments and 2.5D surface representations will be added. The intellectual merit of the project is the change in the nature of CAD systems that better support conceptual design by incorporating sketches and concepts that can be placed on a 3D model without requiring that the model be made consistent, until the designer is ready to enforce consistency. The broader impact of the project is the development of sketching and CAD tools that are relevant to early concept and creative designers.