理学 路径跟踪方法 释 ray casting 光线投射 光线投射技术是基于几何光学的绘制方法的基础。它由视点出发逐像素地向外发射光线，寻找光线与场景的第一个表面交点。
计算机应用 计算机辅助设计与图形学 释文 ray casting 光线投射
- Head-on
- head-on collision
- head-on cross-section
- head-on encounter
- head ornaments of a female role
- head or tail
- headphone
- Head Portrait of Jade God from Xiaojiawuji Site
- Head Portrait of Sargon
- head positioning mechanism
- headprism
- head process
- headquarters model
- headquarters office building/corporate architecture
- Headquarters of the 4th Front Army,Chinese Workers' and Peasants' Red Army
- Headquarters of the 7th and 8th Corps,Chinese Workers' and Peasants' Red Army
- head related impulse response
- head related transfer function
- Headright System
- heads-and-tails distribution
- headshell
- headship-rate
- Head-Smashed-In Buffalo Jump
- heads-of-states conference in Pre-Qin period
- headspace gas chromatography