  A widespread adoption of Virtual, Augmented, and Mixed Reality (VR/AR/MR),
collectively referred to as Extended Reality (XR), has become a tangible
possibility to revolutionize educational and training scenarios by offering
immersive, interactive experiences. In this paper we present \textsf{INTERACT},
an authoring tool for creating advanced 3D physics-based Intelligent Tutoring
Systems (ITS) by individual developers or small-scale development teams.
\textsf{INTERACT} is based on a cutting edge physics engine allowing realistic
interactions such as collision detection and ergonomic evaluations. We
demonstrate the benefits of \textsf{INTERACT} by developing a set of training
scenarios for a use case of a Laser cutting machine. The use case illustrates
the numerous possibilities such as creating interaction with objects, ease of
configuring a scenario and how to design the visual effects to the machine.
