Add lighting and shadows to your scene with light nodes.
You can use a sprite’s lighting properties, lightingBitMask, shadowCastBitMask and shadowedBitMask, to apply effects such as illumination and shadow casting and receiving. These can be used in conjunction with normal mapping to simulate 3D lighting.
The following figure shows a normal mapped sprite node acting as background and two shadow casting sprite nodes (each with a rabbit texture).
The SKLightNode object's categoryBitMask matches the lighting bit mask of the background, and the lighting and shadow bit masks of the two rabbits:
The resulting scene shows the two rabbits casting shadows over the background (the light is rendered as a white circle). The noise texture gains a 3D look from the normal mapping: