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PixelPerfectShadowCaster2D-Unity

Pixel Perfect Shadow Caster (2D) for Unity using Contour Tracing!

Comparison between the following shape providers:

  • SpriteRenderer that uses Sprite.vertices
  • PolygonCollider2D that uses Sprite.GetPhysicsShape
  • PixelPerfectShadowCaster2D that uses contour tracing (ours)

comparision

How To Use

  • Download either:
    • PixelPerfectShadowCaster2D.cs & PixelPerfectSpritePathCalculator.cs
    • latest .unitypackage from Releases
  • Import scripts into project
  • Attach this script to a shadow-casting sprite
  • Make sure the sprite has Read/Write Enabled in texture import settings
  • Change the Casting Source of ShadowCaster2D to Polygon Collider 2D
  • Change the Trim Edges of ShadowCaster2D to 0
  • Set the Alpha Threshold to the desired value, any pixel with alpha < threshold will be trimmed
  • Remove the script from the sprite after using it

Note

Using the PolygonCollider2D as a mediator to set the path of the ShadowCaster2D instead of directly applying it as Unity recommends leaving the code within UnityEngine.Rendering.Universal untouched!

px_perf_shadow_cast_2d_how_to.mp4

Contributing

Contributions to the project are welcome.

License

MIT

Acknowledgement

Thankful to O3 for Contour Tracing Algorithm.