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All these vertices have different Y coordinates yet when I select them all, I cannot move all of them to the same plane of a Y coordinate. How can I move all of them without tedious work?enter image description here

  • This may be related - https://blender.stackexchange.com/questions/35193/move-align-one-vertex-on-a-non-planar-face-to-make-it-planar. In short - scale them all by Z to 3D cursor location, which should be placed on your plane – Mr Zak Aug 06 '15 at 17:41

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To scale all vertices to conform to a certain "plane" in a direction (Y axis), select all the vertices you want to move.

Place the 3D cursor anywhere along the Y plane you want (IE place the cursor's Y position to the position you want your vertices to move to and ignore its Z and X position).

Change the pivot point to 3D cursor

3d Cursor Pivot

Press s to enable scale mode, then press y to restrict scaling in the Y axis. Scale "down" to as close to 0 as possible, or type 0. All the vertices will snap to the cursor's Y position while maintaining their original X and Z coordinates.

beiller
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Select all your veritces and scale to zero SY0

enter image description here