The same three documents that ship inside the package, readable here without buying anything first.
Six steps from an empty scene to your first outline — on a mesh and on a sprite. Read this one first — it is short on purpose.
Everything else: Project Features and presets, the passes, all fifteen styles, hard meshes, cutout, merge groups, skinned meshes, sprites and pixel art, layer filtering, LOD Groups, the recipes, scripting, performance figures and troubleshooting.
Every public type and member of the scripting API, searchable as you type — by name, by signature or by what it does — with an “I want to…” index of common tasks.
Prefer to try before reading? The live WebGL demo runs the full package in your browser — ten chapters, every style, every recipe but Distance Fade, meshes, sprites and pixel art, nothing to download. Most questions this manual answers are quicker to answer by clicking.