Keeping Bezier spiral curve handle tilt perpendicular to a specific axis It's doesn't seem to matter if I use the curves "extra objects" to make the spiral or just create it on my own. I can't seem to find a way to keep tilt parallel to any one axis. Or make tilt uniform in any meaningful way without tilting each handle individually, which is a waste of time.



I'm using this spiral as a curve modifier. I have an object following this spiral curve path. I want to have some control over its orientation and deformation, which is why I'm not using the "follow path" constraint. I'd like to set the handle tilt uniform to a certain axis so the object stays level as it travels up the spiral.

The problem:



The final result will be a flow demonstration with arrows, very similar to this example I made in another project, but with a long spiral as shown above. I need to be able to control how the arrows rotate as they travel along the path.



Is there any way to keep tilt aligned to a specific axis so I can predict object rotation?

I've already tried:
• Setting the "mean tilt" number with all points selected
• Clearing tilt (my example image is what happens when you clear the tilt)
• Convert from curve > mesh > back to curve
• Tilt interpolation options
• Proportional editing while in tilt edit mode
• I need object deformation, so I will not be using path constraints
I solved it! In the Curve Properties menu, Twisting should be set to Z-up.

This makes all handle tilts level to one axis, and from there, I can tilt them all together or one at a time to get my desired result.



And the final result, with no errant twisting or rotating: