This is a snippet of code that can be used to bake per frame point positions of a mesh in Softimage to an ICE Attribute for local storage. This code hasn't been tested in this form and has been extracted from a larger tool. May need some editing / optimization.

softimage_bakeToICEAttr.py

# Baking point positions to an ICE attribute for local caching.
# Eric Thivierge

from win32com.client import Dispatch
from win32com.client import constants

si = Application
log = LogMessage
sel = si.Selection

playCtrl = si.ActiveProject3.Properties("Play Control")

startFrame = 0
endFrame = 100

if sel.Count < 1:
    log("Select a mesh to cache!", 4)
else:
    targetMesh = sel(0)

    # Add ICE Attr for storing cache
    initGeometry = targetMesh.ActivePrimitive.Geometry
    pointCacheAttr = initGeometry.AddICEAttribute("bake_pointCache", constants.siICENodeDataVector3, constants.siICENodeStructureArray, constants.siICENodeContextComponent0D)
    pointCacheAttr = Dispatch(initGeometry.ICEAttributes('bake_pointCache')) # Dispatch Fix
    pointCacheAttr.AlwaysEvaluated = True

    # Build and resize / fill 2D array with initial point pos values.
    # [
    #  [1.0, 1.0, 1.0, ... 1.0] # Pnt 0, init pos from 0-100 frames for each point.
    #  [1.0, 1.0, 1.0, ... 1.0] # Pnt 1 
    #  [1.0, 1.0, 1.0, ... 1.0] # Pnt 2
    #  [1.0, 1.0, 1.0, ... 1.0] # Pnt 3
    #  [1.0, 1.0, 1.0, ... 1.0] # Pnt 4 ...
    # ]

    cacheArray = []
    initPointPositions = list(initGeometry.GetICEAttributeFromName("PointPosition").DataArray)
    for eachPoint in xrange(initGeometry.Points.Count):
        cacheArray.append([initPointPositions[eachPoint] for x in xrange(0, endFrame+1)])

    totalFrames = (endFrame + 1) - startFrame
    for i in xrange(totalFrames):
        playCtrl.Parameters("Current").Value = startFrame + i # change frame

        # Get current geometry at this frame
        currentGeometry = targetMesh.ActivePrimitive.Geometry
        pointPositions = list(currentGeometry.GetICEAttributeFromName("PointPosition").DataArray)

        # Store each point pos into the bake data
        for eachPoint in xrange(currentGeometry.Points.Count):
            bakeData["cacheArray"][eachPoint][startFrame + i] = pointPositions[eachPoint]

    # Once done building up the array set it back to the attribute
    pointCacheAttr.DataArray2D = cacheArray