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build a list of values to blend.
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submodel using vsindex_dict[vsindex]. The indices of the
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We first re-order the master coordinate values.
For a moveto to lineto, the args are now arranged as:
[ [master_0 x,y], [master_1 x,y], [master_2 x,y] ]
We re-arrange this to
[ [master_0 x, master_1 x, master_2 x],
[master_0 y, master_1 y, master_2 y]
]
If the master values are all the same, we collapse the list to
as single value instead of a list.
We then convert this to:
[ [master_0 x] + [x delta tuple] + [numBlends=1]
[master_0 y] + [y delta tuple] + [numBlends=1]
]
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