Particles moving along irregular surfaces
The ground is a flat poly mesh with Formula deformers used to create the hills and valleys.
The meta-blobs are generated with an emitter to travel parallel to the flat
surface,
and then subjected to the same deformers so that they travel along the contoured
surface.
A picture may be worth a 1,000 words, but the file says it all:
C4D
File
JeremyW
This was achived by seting up an emitter to send particles along a flat
plane.
Then an FFD was added
Then a WrapDeformer
JeremyW
A different, but related exploration
JeremyW