Can I just limit user can only modify the x value of a point?

In my effect, I add a point by using PF_ADD_POINT. But I just want user can only modify the x value, is this possible? How can I do it?

hello shibin.chris! welcome to the forum!
well, there's no switch you can flip to have such behavior, but you can:
1. supervise the param, so whenever the user changes the value you can keep
the X and restore the Y. (won't hold water in case of keyframing or
expression)
2. set an expression that would do the same.
3. check the param at some events (such as the render call), and modify the
keyframes and values if necessary. (won't handle expressions)
that's all i can think of.

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