Z-up Problem

What's causing the Z-up problem?

When using a constraint that does not specify the way the Z-axis of the pivot faces (for example, look at constraint, path constraint), Bongo assumes that you want the z-axis to face towards "up" (ie - world +Z).  This keeps the object stable in what would otherwise be a non-fully constrained system.  However, it does mean that when the object pivot z-axis is forced to point downwards by the constraint, you may find that at that point the object will "flip" as it attempts to keep the z-axis pointing up.  

How can I solve it?

This can usually be solved by using the "Look Along Z-Up" or using another pivot orientation of the object.

 

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