How to replace value for all keyframes?

Question

I recorded an animation with my object z set to 1.00 but realised afterwards it needs to be at 3.00 throughout.

How can I set the object's z to 3.00 for all selected keyframes in the dopesheet?

Answer 1

If you mean you want to change its Z position throughout the animation, you can do it with the Graph Editor:

• Select your object, open the Graph Editor.
• Unfold the LocRotScale of the object and lock everything except the Z Location.
• Select the curve and move it up 2 units with G, Y and 2 (Y is the up axis of the Graph Editor).
• Now your object is 2 units up on the Z axis.

Now, about your second question: "If some of my z positions are not 1, but a different value, is there a way to set them all at once, rather than shift them all by the same value?"

Trick to align several vertices on the same axis:

• Select the vertice that is your Y reference, and ctrl G to move your green cursor up to this vertice
• Select the vertices you want to align on the same Y position.
• shift S > Cursor Value.

Better trick suggested by Mr Zak:

• Select the vertice #1 which is the Y position reference.
• ctrl G to make the cursor move to the vertice position.
• Select the 2D Cursor as the Pivot Point.
• Select all the vertices you want to snap to the Y position.
• Scale down to zero with S Y 0