Core Concepts

The flow model, node categories, function graphs, and how code generation actually works — read this before the Node Reference.

• Flows, Nodes, and Pins — nodes, edges, execution vs. value pins, and the legacy "in"/"out" convention.
• Node Categories — the 9 categories, their colors, and main-canvas vs. Function-Graph availability.
• Function Graphs & Blueprint Mode — authoring a function as a nested visual node graph instead of hand-typed code.
• How Code Generation Works — topological sort and ordering, the shared exec-chain walker, Branch/Switch scoping, and hoisting.