Constraints are a fundamental part of parametric modelling in Autodesk Fusion. They control the geometric relationships between sketch elements, ensuring your designs behave predictably when dimensions or shapes change.

By applying constraints such as parallel, perpendicular, coincident, or equal, you can precisely define how lines, arcs, and points interact with each other. Mastering these tools allows for cleaner, more stable sketches and ensures design intent is maintained throughout the modelling process. Understanding and using constraints effectively is key to creating robust, editable, and intelligent 3D models in Fusion.