表題番号：2023Q-009
日付：2024/02/15
研究課題現場で働くプロの手描きデザイナのための対話的なセルアニメ制作支援ツール
| 研究者所属（当時） | 資格 | 氏名 | |
|---|---|---|---|
| （代表者） | 理工学術院 基幹理工学部 | 講師 | 福里 司 |
- 研究成果概要
- This research focused on a technique for designing character using inbetween charts. Inbetween charts are a familiar tool in cartoon production; they are used to show how many inbetweenings go between each keyframe. Typically, inbetweenings are not drawn for all 60+ frames required for one second of animation, and most movements can be done with fewer drawings per second. In addition, to vary the speeds of character movement, animators often place inbetweenings at different intervals on the chart. This technique is called ``the illusion of movement,'' which is a hand-drawn-cartoon-specific characteristic that differs full-CG animation (60+ fps). Digital 2D animation techniques such as shape interpolation methods have increasingly been adopted around the world. However, to our knowledge, no similar software exists that can support inbetween chart design; therefore, digital animators working in cartoon production manually make inbetweenings for cutout animations as follows. (1) First, they render many images of intermediate shapes generated using the above methods, (2) import them to software for digital motion compositing and editing, and (3) select several images among them as a post-process. This approach requires the repetition of the process of converting the selected images to video and checking it until the animator is satisfied. Therefore, we propose an interactive tool to intuitively make inbetween charts, inspired by cartoon animators’ techniques. Given several keyframes, this system constructs trajectory-guided sliders that enable users to directly adjust inbetween values on a screen. In addition, these sliders can visualize simple inbetween timings to provide guidance on cartoon-like motions, such as animating ``on twos'' and ``slow-in/out'' in the background of the slider. This method is simple enough to easily implement in existing animation-authoring tools. We conduct a user study with novice and amateur users and confirm that the proposed slider is effective for manually constructing the inbetween charts envisioned by the users.