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So, this is all hypothetical. This isn't really anything I am trying to do at the moment, but what I want to know is how to keyframe constraints. Example: Say I have an item that - at some point in the animation - needs to be picked up by a character. (e.g. the item could be a sandwich.) Is there any way to initialize a 'child-of' constraint type and have it become inactive or dormant at points in the animation? If you had a character with a constrained item object, then it would seem reasonable for him to have a need within your plot to put the item down and not have that item drag along behind him every time he moved his hand like a puppet tied to his finger with an invisible thread.

Thanks!

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    $\begingroup$ Does this help? $\endgroup$
    – VRM
    Jan 12 '15 at 15:53
  • $\begingroup$ @NoviceInDisguise Wait, is it the influence parameter affecting that? If I keyframe influence to 0 will that parenting relationship be lost? (Temporarily, I mean.) $\endgroup$ Jan 12 '15 at 15:59
  • $\begingroup$ That is what I gathered form it. Give it a try and see how it works! $\endgroup$
    – VRM
    Jan 12 '15 at 16:00
  • $\begingroup$ @NoviceInDisguise Thank you! I can't actually try it right this minute, but I can assume it will work! :) $\endgroup$ Jan 12 '15 at 16:01
  • $\begingroup$ I will see if I can rig something up and test it real quick, I'll let you know what I come up with! $\endgroup$
    – VRM
    Jan 12 '15 at 16:02
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You can do this by animating the Influence value (hover over it and press I). This tells Blender how much the constraint will affect the object.

enter image description here

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    $\begingroup$ To add a keyframe: hover over the influence slider and press I. $\endgroup$
    – user1853
    Jan 12 '15 at 16:40
  • $\begingroup$ Right-clicking the influence slider shows more keyframe options, including options to add a driver. $\endgroup$
    – R. Navega
    May 30 '17 at 7:33

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