Undo c4d.BASEDRAW_DATA_PICTURE ?

[Helper]

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On 02/07/2012 at 11:36, xxxxxxxx wrote:

I'm trying to find out the way to be able to Undo
a change of a filepath for the Background image.
There are no problems anywhere else (for materials, objects using
shaders etc). But when I use the same method as in a Material,
no Undo is registered for the image path of the Background image, see below.

Anyone have an idea?

I've tried the different Undo Flags available with no success.
OTOH, changing any parameter in the Viewport AM (Shift + V) manually
doesn't register for an Undo either, so maybe this is not possible?

Cheers
Lennart

  
doc.StartUndo()   
bd      = doc.GetRenderBaseDraw()   
abspath = bd[c4d.BASEDRAW_DATA_PICTURE]   
if abspath == '':   
    print 'No Active BaseDraw Pict'   
    return   
       
relpath = os.path.split(abspath)[1]   
if relpath in globtex:   
    doc.AddUndo(c4d.UNDOTYPE_CHANGE_SMALL,bd)   
    bd[c4d.BASEDRAW_DATA_PICTURE] = relpath   
    print '[ BG Picture ]',relpath,' : Set to Relative Path'   
else:   
    print '[ BG Picture ]',relpath,' : Is NOT in Global Texture Paths!'   
doc.EndUndo()