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Pixel Perfect Shadow Caster (2D) for Unity
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aniketrajnish/PixelPerfectShadowCaster2D-Unity
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Pixel Perfect Shadow Caster (2D) for Unity using Contour Tracing!
Comparison between the following shape providers:
SpriteRendererthat usesSprite.verticesPolygonCollider2Dthat usesSprite.GetPhysicsShapePixelPerfectShadowCaster2Dthat uses contour tracing (ours)
- Download either:
PixelPerfectShadowCaster2D.cs&PixelPerfectSpritePathCalculator.cs- latest
.unitypackagefromReleases
- Import scripts into project
- Attach this script to a shadow-casting sprite
- Make sure the sprite has
Read/Write Enabledin texture import settings - Change the
Casting SourceofShadowCaster2DtoPolygon Collider 2D - Change the
Trim EdgesofShadowCaster2Dto 0 - Set the
Alpha Thresholdto the desired value, any pixel with alpha < threshold will be trimmed - Remove the script from the sprite after using it
Note
Using thePolygonCollider2D as a mediator to set the path of theShadowCaster2D instead of directly applying it as Unity recommends leaving the code withinUnityEngine.Rendering.Universal untouched!
px_perf_shadow_cast_2d_how_to.mp4
Contributions to the project are welcome.
MIT
Thankful to O3 for Contour Tracing Algorithm.
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