教程内容：
- 人群系统基础：介绍人群的基本概念和行为模式。
- VEX技术应用：学习如何在VEX中主要使用pcopen来收集邻近粒子的信息，实现Reynolds Boids行为。
- 反应机制：讨论如何让人群根据不同参数产生反应。
- 内置人群工具：了解Houdini内置的人群工具如何与人群求解器结合使用。
- 交通系统实验：探索使用VEX控制和设置交通系统所需的向量和力等属性，实现交通系统的模拟。
所需软件：
- Houdini 18：本教程专为Houdini 18版本设计。
教程信息：
- 教程时长：37分钟。
- 素材：不包含工程文件，学习者需跟随教程步骤自行操作。
- 字幕：英文无字幕，适合具备一定英语听力基础的学习者。
- 视频格式：MP4，分辨率为1920×1080，提供高清学习体验。
For the third project in my Houdini course, we had to create a crowd system. The first few lectures covered basic concepts about crowds and how they behave. We also learned techniques like how to implement Reynolds Boids behaviors (separation, alignment, and cohesion) in VEX mainly by using pcopen to gather information from neighboring particles; furthermore, we discussed how to make them react one way or another depending on various parameters, so that was pretty cool. Then we learned more about the built-in Houdini crowds tools that can automatically do all that for you in conjunction with the crowd solver. While the crowd solver and the built-in tools are pretty amazing, I really wanted to experiment and push what I could do with VEX, so I thought a traffic system would be unique. In my mind, the traffic system, being something so mechanical, would give me the opportunity to be in charge of controlling and setting up every necessary attribute like vectors and forces to make the traffic system feasible. At the same time, simulated traffic systems don’t seem to be your typical Houdini project, so I saw it as a double win.
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