Hi Pilou, sorry maybe I have misunderstood your question completely.
I thought you were talking about projecting a curve onto a surface, then editing the curve and have the surface move with it.
But it seems you are talking about having a curve on a surface, which you can edit and that the curve stays on the surface while you manipulate the curve?
That is something that would be called a "curve on surface". It can be possible to create the curve in the UV space of the surface and then also edit it there, which means that the edited curve stays on the surface.
MoI does not currently have anything set up to make editable UV curves like that though, but maybe in the future at some point.
- Michael
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