While many algorithms exist for tracing various contours for illustrating a meshed object, few algorithms organize these contours into region-bounding closed loops. Tracing closed-loop boundaries on a mesh can be problematic due to switchbacks caused by subtle surface variation, and the organization of these regions into a planar map can lead to many small region components due to imprecision and noise. This paper adapts "snaxels," an energy minimizing active contour method designed for robust mesh processing, and repurposes it to generate visual, shadow and shading contours, and a simplified visual-surface planar map, useful for stylized vector art illustration of the mesh. The snaxel active contours can also track contours as the mesh animates, and frame-to-frame correspondences between snaxels lead to a new method to convert the moving contours on a 3-D animated mesh into 2-D SVG curve animations for efficient embedding in Flash, PowerPoint and other dynamic vector art platforms.
翻译:虽然存在许多算法,可以追踪显示网状物体的各种轮廓,但很少算法将这些轮廓组织成区域封闭环绕。在网状上追踪闭环边界可能会由于细微表面变异造成的回转而产生问题,而将这些区域组织成平面图则会由于不精确和噪音而导致许多小区域组成部分。本文将“螺旋”这一为稳健网状处理设计的能将主动轮廓最小化的方法改制成一种新的方法,并将它重新用于生成视觉、影子和阴影轮廓,以及一个简化的视觉-地表图,用于显示网状的星形矢量艺术图。Snaxel主动轮廓还可以追踪轮廓作为网状的轮廓,以及星座之间的架对框对框通信导致一种新方法,将3D型网状网状的移动轮廓转换为2-DSVG曲线动画,以高效地嵌入闪光、动力定位和其他动态矢量艺术平台。