Collapses selected in vertices in Y axis and stores the offset in the V component of the second uv channel.

mlFlattenYStoreV.py

import modo
from mlFoundation import mlMath

mesh = modo.Mesh()
uvmap = mesh.geometry.vmaps.uvMaps[1]

bb = mlMath.BoundingBox3D()

for vertex in mesh.geometry.vertices.selected:
	bb.EncapsulatePoint(vertex.position)

with mesh.geometry as geo:
	for vertex in geo.vertices.selected:
		pos = vertex.position
		yPos = pos[1] - bb.center[1]
		pos = (pos[0], bb.center[1], pos[2])
		vertex.position = pos

		vertex.setUVs((0, 1-yPos), uvmap=uvmap)