With reactor, you can easily create a simple physical simulation by simply assigning rigid body properties to objects and adding them to a Rigid Body Collection. When you run the simulation, objects can fall from the sky, slide across each other, bounce off each other, and so on. However, let's say you want to simulate a real-world scene such as a person pushing open a door. How, for instance, do you make sure that the door rigid body doesn't just fall onto the ground, or that it swings out in the proper direction when pushed?
To accomplish this you use constraints. These let you restrict the possible movement of objects in the physical simulation. Depending on the type of constraint you use, you can hinge objects together, attach them together with springs that will snap back if the objects are pulled apart, or even simulate the movement of a human body joint. You can constrain objects to each other or to points in space.
This section shows you how to work with constraints in reactor. It includes the following sections:
Simple Constraints, which includes the following topics:
Cooperative Constraints, which includes the following topics: