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It appears my flowchart is nonplanar (it contains a subdivided K_3,3...)

How do I colour specific arrows, so I can make it visually clearer what's going on when they inevitably cross? (by 'arrows', I mean the whole arrow as opposed to just the arrow head).


(/how can I create a 3D flow chart?)

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Please include an example of what you have done, so that we may understand better what you are trying to do. – Frédéric Jan 8 '12 at 1:02
up vote 3 down vote accepted

Simply add the color to the options to \draw or \path, such as



\path[line,red] (a) -- (b);
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