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Problems with auto orient on a 3D path

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Paul GaleProblems with auto orient on a 3D path
by on Dec 11, 2009 at 2:08:07 pm

I'm sure I'm missing something fundamental here but can't work out what it is from the last hour of searching!

I'm trying to auto-orient an image along a 3D path that's only drawn in X and Y coordinates. The path is a fairly complex one with several loops etc.

My problem is that the image flips with the axes as the image moves along the path i.e. at the edges or top/bottom of the loop.

How do I prevent the image from doing this and make it work as it does when in 2D space? Is an expression needed or have I missed something obvious?


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