Progression

Talent trees and attribute points. A tree is a class or specialization: the talents a unit can learn and how many points it earns per level. Learning a talent pushes its grants into the unit; a reset takes them all back.

See it running: the 06 · Leveling and Talents demo scene. See Demos to import the scenes.

Every field, its default and every member you can call: Progression reference.

Authoring

Create → Vantage → Progression → Talent for each node. Set the level, prerequisites, ranks, cost and what each rank grants.
Create → Vantage → Progression → Talent Tree. Drag the talents in and set the points per level.
Assign the tree to Talent Tree on the unit definition. A VtUnitProgression component attaches on spawn.

Talent field	Meaning
Required Level	Minimum level for the first rank.
Prerequisites	Talents that must already be learned, each at a rank.
Max Rank	How often it can be learned. Modifiers and attribute grants multiply by the rank.
Point Cost	Talent points per rank.
Auto Learn	Learned on its own, for free, as soon as level and prerequisites allow. Use it for “Fireball at level 5”.
Abilities	Granted at the first rank, revoked on reset.
Modifiers Per Rank, Attribute Grants Per Rank	Same rows as an item, times the rank.
Trait Overrides	Applied while any rank is learned.

Tree field	Meaning
Starting Talent Points, Talent Points Per Level	Talent points at level 1 and per level after it.
Starting Attribute Points, Attribute Points Per Level	Attribute points the player places by hand. 0 per level disables allocation.
Spendable Attributes	Which attributes take points. Empty means any.

A class choice is a tree per class on separate unit definitions, or one definition whose tree you swap before spawn.

Runtime

var progression = player.GetComponent<VtUnitProgression>();

progression.TalentPointsAvailable;
progression.AttributePointsAvailable;
progression.GetRank(talent);

if (!progression.CanLearn(talent, out var reason)) ShowReason(reason);
progression.TryLearn(talent, out reason);
progression.TrySpendAttributePoint(strength, out reason);
progression.Reset();
progression.GrantBonusTalentPoints(1);

progression.OnTalentLearned       += (talent, rank) => { };
progression.OnAttributePointSpent += (attribute, points) => { };
progression.OnPointsChanged       += () => RedrawTree();
progression.OnReset               += () => RedrawTree();

Reasons: NotInTree, MaxRank, LevelTooLow, MissingPrerequisite, NoPoints, AttributeNotAllowed, and AuthorityNotLocal on a networked client, where the request travels to the server and the events report the outcome. Ranks, spent points and bonuses save with the unit.