Transparency Rendering in Computer-Aided Design: Methodologies, Trade-offs, and Challenges
Graphics
Summary
The authors review how transparent objects are shown in CAD software, important for designers to clearly see complex parts inside machines or assemblies. They compare fast but approximate methods with slower but exact ones, considering different device types like desktops and mobiles. They also highlight the need for better tests and quality measures specific to CAD visuals. The paper looks at special techniques to make important interior parts easier to understand, and discusses challenges in handling transparent solid objects accurately. Overall, the authors summarize current tools, problems, and future improvements in CAD transparency rendering.
Authors
Grigoris Tsopouridis, Ioannis Fudos
Abstract
This paper surveys the state of transparency rendering in Computer-Aided Design (CAD), with a focus on both practical deployment in industrial systems and the underlying algorithms. We first review current approaches to transparency rendering in CAD environments and outline application scenarios in which accurate and performant transparency is critical for design inspection, communication, and decision-making. We then analyze the trade-offs between approximate and exact transparency techniques, comparing their performance-quality balance on desktop and mobile platforms and discussing criteria for selecting appropriate methods. The survey further identifies the need for robust benchmarks, quality metrics, and evaluation methodologies tailored to CAD-specific visualization tasks. We examine techniques for emphasizing important interior components such as importance-driven transparency, silhouette-based methods, and related approaches to support effective spatial understanding in complex assemblies. Finally, we discuss the unique challenges of rendering transparent constructive solid geometry (CSG) objects, including robustness, correctness, and integration with modern rendering pipelines. Collectively, these contributions characterize current capabilities, systematize open problems, and outline future research directions for transparency rendering in CAD visualization.