Chunk Generator caves

I am working on a ChunkGenerator, and I am wondering what a good method would be for creating caves. Currently, I could create a sphere of air, but it looks completely unnatural. Does anyone have an idea to make natural looking caves efficiently?

 

@Skionz try a for loop with tons of mini spheres, space them apart randomly

 

@Concurrent

That sounds like it would be very, very ugly.

 

@mythbusterma but it may look natural?

 

@Concurrent

I would seriously doubt that'd look natural, plus, it would be non deterministic. Worlds should generate the same each time based on their seed.

 

@mythbusterma idk Ive never developed a generator though right after I posted that's I considered the 3 nested for loops and the lag however it probably would look natural (only taking world edit into consideration).

 

You could replicate one of mine craft's caves.

 

@Skionz
Minecraft uses the "perlin worms" algorithm, look it up.

 

I have tried it and it look pretty bad and it is very slow; however perlin worms looks promising.

 

@Skionz yea after considering it its a bad idea... my bad