hi am back 
am introduce ways to generate caves like minecraft :] is 3d perlin noise and perlin worm
- 3D perlin noise i make it hollow inside so i can be reduce some lag if u make mining sys u should update it or remove.
Delightex Nova
Delightex :: 3d perlin noise - perlin worm
Delightex Nova
Delightex :: perlin worm
have great coding day