9 / 2022-09-05 14:20:12

基于草绘的三维建模在电影预演制作中的应用

摘  要：电影预演用于大规模拍摄前对即将拍摄的内容进行可视化预呈现，利用数字资产制作预演动画，用于展示摄影机运镜、现场设置、演员走位等，为电影导演、摄影指导及视效总监等主创人员提供更加直观的视觉参考。基于草绘的三维建模技术逐渐被应用于数字资产快速生成，受此启发，本文提出一种基于草绘建模和游戏引擎的电影预演制作流程。采用基于草绘的三维建模方法制作电影预演动画所需的数字资产，设计几何体类建模实验，人物及动物建模实验，及用户体验实验，分析其生成效果并邀请被试参与流程评估。实验结果表明，本文提出的预演制作流程符合用户制作使用习惯，且能够得到令用户基本满意的动画效果。基于草绘的三维建模方法有助于提升动物模型生成效果，制作流程高效，能与电影制作工业化流程协同，适合用作电影预演制作的三维模型创建。

关键词：电影预演；三维建模；动画生成

Abstract：Pre-Visualization (previs), the visualization of film content before shooting, uses digital assets to produce animation video, shows the camera movements, settings and actors position. Previs provides visual reference for director, cinematographer, VFX artists and other staff in a “what you see is what you get” way. Recent advances in the field of sketch-based modeling encourage the development of 3D Reconstruction. Inspired by this, we propose a previs production process based on sketch-based modeling and game engine. In the process, sketch-based modeling method is used to produce the digital assets. The geometric modeling experiment, human and animal modeling experiments, and user experience experiments were designed to analyze the outcomes. Through interviews and questionnaires, we conducted a user study to invite users to participate in process evaluation. The experiment results show that the production process meets the requirement of users operative habits, and its animation video is satisfactory. Sketch-based modeling is helpful to improve the animal model production, where the process is efficient, the operation skills are easy to master, its process of using can be coordinated with the previs production.

Keywords：previs; 3D modeling; previs; animation production