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Is it possible to add something like a delay to a constraint (e.g. Transform or Copy Loc / Rot) or to a driver?

For example, a driver should copy the rotation of a target which it had 10 frames ago. At the moment I'm using a scripted expression for copy rotation.

bpy.data.objects['Armature'].pose.bones['Bone'].rotation_euler.y

But this, of course, is only the rotation in the actual frame. I would not use any keyframes.

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  • $\begingroup$ I'm not sure about constraints, but you can do this for parented objects with Slow parent in Properties > Object > Relations Extras. $\endgroup$
    – gandalf3
    Commented Jun 11, 2014 at 9:34
  • $\begingroup$ Thanks i'm not sure if this will work for me but it's if nothing else works this is a point to start with. $\endgroup$
    – user2488
    Commented Jun 11, 2014 at 9:51
  • $\begingroup$ This is a book example for using app.handlers. $\endgroup$
    – Jaroslav Jerryno Novotny
    Commented Aug 13, 2015 at 20:00

1 Answer 1

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You can use a conditional if statement in the Driver expression which waits for a specific frame number before evaluating as true.

So for example, here a Camera is tracking an object (Sphere-X) based on a Driver but I don't want this to kick in until frame 130 (until then I want the camera to stay at 200 on the x-axis):

Delayed driver

Using the expression: 

var if frame>130 else 200

Based on a ternary conditional operator:

valueIfTrue if isConditionTrue else valueIfFalse
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