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Changing Bezier curve control points by dragging the curve

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Hi everyone,

I have created a roading system where roads are drawn by a five control point bezier curve through the center of them and using parallel curves defining the outer edge.

As we all know the way to change a bezier curve is to move the control points but what I want to know is, is there a way to move the control points by dragging the curve?

In other words move the control points based on where the curve is being moved to.

I won't need to worry about the start and end control points because the are being handled differently but how would I figure out the other three control points?

I read online that bezier curves are not the best way to go with this but rather that I should use b-splines. What does everyone think?

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