Class BlendTree2D

2D blend tree — selects between animations based on two parameters. Uses inverse-distance weighting for smooth blending.

Usage:

const tree = new BlendTree2D([
  { animKey: 'idle', x: 0, y: 0 },
  { animKey: 'walk_n', x: 0, y: -1 },
  { animKey: 'walk_e', x: 1, y: 0 },
  { animKey: 'walk_s', x: 0, y: 1 },
  { animKey: 'walk_w', x: -1, y: 0 },
]);
tree.evaluate(0.5, -0.5); // → weighted blend between walk_n and walk_e
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