Non-destructive spline based tools for world building

Spline Regions Example: https://www.youtube.com/watch?v=8g2yZPTizvI

Spline Path: https://www.youtube.com/watch?v=-eRF9GKeqKI

Handling scaled and rotated splines: https://www.youtube.com/watch?v=oblXq2yCer8

Slope based texturing: https://www.youtube.com/watch?v=aAc5zOlYCaw

Spawning objects on a normal https://www.youtube.com/watch?v=cTH4-zR3FWQ

Performance of spawning a lot of objects: https://www.youtube.com/watch?v=epasuU7Pd7w

Nosemap Stamping: https://www.youtube.com/watch?v=G1-2muxue8w

Heightmap Editing: https://www.youtube.com/watch?v=3AE-xW8ciBk

Modifiers system: https://www.youtube.com/watch?v=-kiTEbbKpCI