Do the vertices of the geometry change, when I rotate the mesh?

Questions
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1

I have two objects which I merge together with the help of the [three-csg-ts](https://www.npmjs.com/package/three-csg-ts) module. So far this has worked splendidly, until now. What I had done before, is to merge different geometry, which all exists as children of the same parent mesh.

Now, I’d like to merge two of these parent meshes together. I have rotated 1 mesh via the rotateX function, and when trying to merge the two meshes together. It merges both of them on a flat surface. This makes me understand that when I call the rotateX function on a mesh object (Object3D in this case). It does not effect the positions of the vertices of the geometry. Is that a right assumption? And if so, what can I do to apply the rotation of my mesh. So that the vertices of my geometry align?

2

hello,

this tuto explain how local or world coordinate system works when we go from scene to children and children of children etc . super tuto i ve just read this afternoon . thank it , i am now able to create pivot vertex use for arm of robot etc .

to answer to your question . position of vertices dont move inside geometry of a mesh when you change position, rotate or scale .the transformation is always according local coordinate system of parent apply on the whole vertices .

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