python-sop and time

[Witt]

I create a simple network:

box -> xform -> timeshift

xform has expression: ty = hou.frame()

timeshift expression: frame = $F-20

all works fine.

But if I create analogous python-sop instead of xform,

it will ignore the timeshift-node.

Why this happens?

How to affect python-sop's hou.frame() by timeshift?

python-sop:

geo = hou.pwd().geometry()
f = hou.frame()
for point in geo.points():
    p  = point.position()
    point.setPosition((p[0], p[1] + f, p[2]))

[Div]

I had the same problem, see my post :

A Python Sop would not be recooked at each frame, so you have to use it within a sop solver, or maybe with a feedback sop.

Edited August 12, 2009 by Div