Try adding the keyword all_intersections to each isosurface statement. This 
will help because external objects are being used with the isosurfaces.

I checked your script and I believe it also renders correctly if the 
isosurface keyword max_trace is used, with a value of only 2. Instead, 
all_intersections simply continues to look for those surfaces whereas 
max_trace limits that search to what you specify.

Bob

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