I have several sprite nodes in my scene that are casting shadows. I also have a sprite that is in one of the shadows. I want to be able to tell if the user moves a sprite out of a shadow into the light. Anyway to do this in swift? Thanks.
iOS 8 detect if SKSpriteNode is lit by SKLightNode
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Unfortunatly this functionality still isn't included in SpriteKit, however it is possible to implement a decent solution with some caveats.
To determine if a sprite casts a shadow, its
shadowCastBitMask
property "is tested against the light'scategoryBitMask
property by performing a logical AND operation." SpriteKit appears to generate the exact same mask data for lighting and physics body calculations, based on the description given in the documentation for theshadowColor
property defined onSKLightNode
:SKPhysicsWorld
has a method,enumerateBodies(alongRayStart:end:using:)
, for performing this kind of ray intersection test performantly. That means we can test if a sprite is shadowed by any sprite with a physics body. So we can write a method like this to extendSKSpriteNode
:We can also retrieve which lights in the scene are lighting a particular sprite:
It'd be great if SpriteKit provided a way to retrieve this information without coupling it to the physics API, or else requiring developers to roll their own ray cast implementations.