UNDERSTAND CONSTRAINTS FROM FIRST PRINCIPLES

In this video, you will develop an intuitive understanding of what constraints really are and how they limit motion by reducing degrees of freedom. Through simple 2D and 3D examples, you will learn to think about rigid bodies in terms of the movements they are allowed to perform, and how adding constraints changes that motion. Instead of just following steps, you will build a mental model that helps you understand why constrained systems behave the way they do.

By the end, you will understand how hard constraints function inside rigid body simulations in Houdini, how to construct a basic constrained setup like a pendulum, and why simulations can become unstable when constraints conflict. You will also see how different constraint configurations can produce a range of behaviors—giving you a strong conceptual foundation for exploring more advanced constraint setups in the future.