Mesh transformation problem - flower petals

I have a problem I’m trying to solve since a long time:

I generated a “flower” geometry (petals rotating around a pivot point)
and I am trying to make the petals close on mouse move. So it looks like a flower opening and closing.

(I know I can also generate it as instanced geom, but for now did just many meshes which I update in the render loop…)

Unfortunately I have no idea how to make the petals rotate in the right direction.

Below are two petals going up so you know what I mean (the solution is not right though), I just want all the petals going up.

Will be thankful for anyone who can help me or give me a hint how to solve it.



It may be a bit easier if you move all rotation to the update function:

Saves the hassle of reseting the transformations or calculating the local rotation by hand.

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Thanks a lot! That’s exactly what I needed.