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I'm trying to use an array and a curve modifier to create a simple track along a single bezier curve.

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I've run into a small issue though when I try to have the path curve around a corner while also lowering elevation at the same time:

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After the sloped turn completes and straightens out, the path becomes tilted despite all control handles having 0 tilt:

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After this point, the tilting remains along the path unless I manually tilt in the opposite direction to offset but I don't like this since it seems incorrect and I don't know an exact number to use as a tilt offset.

Tilting doesn't occur if the turn is made while keeping the control handles at the same z-axis height:

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How can I ensure the path is always facing straight up along the z-axis (unless I add tilt)?

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