Unity development pattern library

Reference patterns for Unity 6 development. Use as lookup.

Architecture decision tree

Project type: 2D? 3D? Mixed?
  Pick Render Pipeline: URP (most), HDRP (high-end), Built-in (legacy maintenance only)

Entity count at peak: < 100? 100-1000? > 1000?
  < 100: MonoBehaviour everywhere
  100-1000: MonoBehaviour with pooling
  > 1000: Consider ECS/DOTS — does team have experience?