Hi Fredo,
I want to report to you what seems to be bugs with the plugin in SU2021:
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Trying to click and drag a control point often results in no action at all. That's especially true when zoomed in for precison movements, regardless of the number of segments, and even deactivating sticking to inference points. After many attempts, sometimes the control point moves. But it's very hit-and-miss, making the plugin unusable for complex works. Many other times, the control point stops moving before you are done editing it.
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I can't seem to find a way to control the weight/angle at each side of the control point. Maybe I'm missing something here, or maybe it is not an implemented feature yet.
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When you add a control point in edit mode, the plugin immediately exits the edit mode. So the edit mode has to be reselected each time you want to modify the control point that has just been added. And in doing so, everytime the plane you selected (for example XY or XZ) gets reset. So it's quite likely that you forget about reselecting the correct plane each time, which ends up in wrong edits.
Hope this help in hunting bugs. Let me know if I can help with experimenting, or just uploading a vid of the problems.