The geometry of lines occurs naturally in such different areas as sculptured surface machining, computation of offsets and medial axes, surface reconstruction for reverse engineering, geometrical optics, kinematics and motion design, and modeling of developable surfaces. This book covers line geometry from various viewpoints and aims towards computation and visualization. Besides applications, it contains a tutorial on projective geometry and an introduction into the theory of smooth and algebraic manifolds of lines. It will be useful to researchers, graduate students, and anyone interested either in the theory or in computational aspects in general, or in applications in particular. From the reviews: "The authors have combined results from the classical parts of geometry with computational methods. This results in a unique and fascinating blend, which is shown to be useful for a variety of applications, including robotics, geometrical optics, computer animation, and geometric design. The contents of the book are visualized by a wealth of carefully chosen illustrations, making the book a sheer pleasure to read, or even just browse in. The book will help to bring the concepts and techniques of line geometry, which have been shown to be useful for various applications in geometric design and engineering, to the attention of a wider audience." B.JA1/4ttler, MATHEMATICAL REVIEWS Clippings 2002f ..".There is a vast amount of fascinating geometry of all sorts in this book. The topics are perhaps somewhat eclectic - they mirror the primary interests of the authors - but, because the motivation is to develop the geometry that applies to real world problems, the subject is far from monolithic and is open to interpretation. The ideas here build up layer upon layer. In the end, the authors have been mostly successful in sustaining their central theme, despite the need to weave together projective, differential, algebraic and metric geometry. They have also presented the mathematics in a predominantly modern way. That is important because there exist in the engineering literature archaeological remnants of outdated notation and concepts. ....] The large number (264) of line diagrams are of very good quality and considerably enhance one's understanding. ...] a book which is without doubt an important contribution to this growing branch of geometrical research." P. Donelan - New Zealand Mathematical Society Newsletter 87, 2003 "a ] Overall I recommend this text to anyone who wants to learn about line geometry, projective geometry and the geometric side of some algebra. The book fills a niche that has been neglected for long and should benefit researchers interested in geometric methods. a ] It covers a body of knowledge that is underrepresented in the literature and deserves to be known more widely. The authors wrote a clearly developed and beautifully illustrated book that fills a gaping hole in the contemporary literature." ACM SIGACT News 36:3, 2005
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这本书的叙事方式带有浓厚的学术气息,对于那些已经具备一定线性代数背景的读者来说,它无疑是一座宝库。我特别欣赏它对“几何约束求解”的探讨,这在现代CAD/CAE领域是核心技术之一。作者没有止步于求解单个直线或平面的交点,而是扩展到了更复杂的约束系统,比如“点到直线的距离最小化”这类优化问题。书中对拉格朗日乘数法在几何约束优化中的应用介绍得非常到位,它将微积分的思想完美地嫁接到了纯粹的几何结构中,展现了跨学科融合的力量。不过,这本书的结构安排上,有些章节的关联性不够紧密,像是一个个独立的专题汇编,而非一条清晰的主线。例如,关于非欧几何的简短介绍,虽然在理论上丰富了内容,但与前几章关于欧氏空间计算的实际应用联系较为松散,对于希望建立系统化知识体系的读者来说,可能会觉得知识点之间存在一些“断层”。总而言之,这是一本需要反复研读、细细品味的深度参考书。
评分我拿到这本书的时候,本以为这是一本纯粹的算法实现指南,但翻阅后发现它远不止于此,它更像是一本关于“几何思维”的教科书。书中对直线和平面交点的处理,展示了一种非常优雅的数学建模方式。我注意到作者对参数方程和隐式方程的切换运用自如,并且非常强调在不同应用场景下选择最合适表示方法的哲学思考。比如,在处理光线追踪问题时,如何利用符号距离函数(SDF)来表达复杂的曲面,并通过与直线的交点计算来确定可见性,这部分内容的论述深入浅出,将纯粹的解析几何与实际的渲染需求完美结合。然而,我个人觉得书中关于数值稳定性的讨论略显不足。在实际编程中,浮点数的精度问题往往是导致几何计算崩溃的主要原因,虽然书里提到了epsilon值的使用,但缺乏对病态条件(ill-conditioned problems)的深入分析和应对策略,这使得书本的实用性在某些极端情况下打了折扣。对于希望直接用于工业级软件开发的读者来说,这部分内容可能需要读者自己去补充实践经验。
评分这部名为《计算直线几何》的书籍,从我个人的阅读体验来看,它所呈现的数学美学和严谨性是令人印象深刻的。我首先想谈的是其对基础理论的构建,作者似乎非常注重从最核心的几何公理出发,逐步推导出复杂的代数表示。书中对于如何将欧几里得几何转化为向量代数,再过渡到更抽象的射影几何框架的讲解,显得尤为扎实。我特别欣赏作者在引入矩阵和行列式时,不仅仅是作为计算工具,而是深入剖析了它们在描述几何变换(如旋转、平移、缩放)中的内在逻辑。例如,在讨论共线性判断时,书中给出的基于叉积(或外积)的判断方法,不仅清晰易懂,而且在计算效率上远胜于传统的斜率比较法,这对于后续编写高效的几何算法至关重要。不过,书中对某些高维空间的泛化描述略显跳跃,对于初学者而言,可能需要更多的辅助理解材料来弥补这种抽象性的跨越。总体来说,它为理解现代计算机图形学和空间数据结构打下了坚实的理论基础,其对细节的打磨值得称赞。
评分这本书在内容组织上呈现出一种独特的节奏感,从基础的二维平面几何,稳步过渡到三维空间,最终触及到更广阔的计算几何领域。我尤其被其中关于凸包算法的章节所吸引,它不仅仅罗列了Graham扫描和Jarvis步进等经典算法的步骤,更重要的是,它探讨了这些算法的时间复杂度是如何受到输入数据分布的影响的。作者没有回避对“最坏情况”和“期望情况”的分析,这使得读者能够真正理解算法的性能边界。当我尝试用它来指导我实现一个碰撞检测模块时,发现书中对最小包围盒(Bounding Box)和分离轴定理(SAT)的介绍,提供了极其清晰的几何直觉支撑。如果说有什么可以改进的地方,那就是插图的质量和数量。在描述复杂的空间关系,比如两个三维平面之间的交角或者多面体的拓扑结构时,几张质量一般的黑白图示,远不如一幅精美的三维渲染图来得直观。对于这种高度依赖视觉信息的学科,高质量的视觉辅助材料是提升学习效率的关键。
评分读完这本《计算直线几何》,我最大的感受是它在理论深度上的压迫感,但这种压迫感并非令人却步,而是催人奋进。它不像市面上很多“速成”书籍那样只教你如何调用库函数,而是坚持“知其所以然”。其中关于仿射变换和透视投影的章节尤其精彩,它清晰地解释了为什么我们观察到的世界(透视投影)可以被有效地用线性代数工具来模拟。作者对齐次坐标(Homogeneous Coordinates)的引入和精妙运用,简直是点睛之笔,它一举解决了平移操作在矩阵乘法中的非线性难题,使得所有的几何变换都能被统一处理。然而,这种对纯数学推导的偏爱,也带来了一个副作用:它在处理离散化问题时显得力不从心。例如,在讨论如何将连续的直线几何概念映射到像素网格上时(栅格化),书中提供的 Bresenham 算法的描述显得过于简略,缺乏对其离散误差累积的深入探讨,这使得它在图形学前端应用中的指导意义相对减弱。
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