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I have an empty parenting a camera and the empty is following a bezier curve thru a constraint. I have the camera 'Track'ed to' a moon, but as the Empty/camera travels along the bezier curve I want to switch 'track to' from the moon to the earth at some definable point. How can I do this? Also the Empty/Camera contines to run beyond the end of the bezier curve. How do I get the Empty/Camera to stop at a definable point and just focus on the earth

enter image description here

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    $\begingroup$ The focus bit is a separate question and should be edited out. Secondly, you can animate the influence of two Track To constraints to cross fade as necessary. Will this do what you need? $\endgroup$
    – TheLabCat
    Commented Sep 2, 2021 at 15:45
  • $\begingroup$ I cannot figure out how to animate the influence. I can see how influence affects the camera but when I add keyframes for Location,Rotation,Scale, they do not know or respect the influence. I've read up in the manual but how this works is not clear. I have two track to constraints for my camera $\endgroup$
    – Jon
    Commented Sep 7, 2021 at 23:16
  • $\begingroup$ No not animate location rotation and scale while influence is on, animate the influence. As in, right click the 0 to 1 value bar that says “influence“, and then click “add key frame” $\endgroup$
    – TheLabCat
    Commented Sep 7, 2021 at 23:27
  • $\begingroup$ Crikey - almost there. I did not know / missed the add key frame right click on influence slider. I want the camera pointed to moon (1) earth(0) and then rapidly turn to focus on the earth(1) moon(0) - but I can't quite get there. As an animation the camera wants to animate around, I want a hard pivot. Thx in advance TheLabCat $\endgroup$
    – Jon
    Commented Sep 7, 2021 at 23:49
  • $\begingroup$ Hmm… Wait a minute! You don’t have to turn the first constraint off, because the second constraint will override it. Just skip the animation of the first constraint and see if that helps. $\endgroup$
    – TheLabCat
    Commented Sep 7, 2021 at 23:50

2 Answers 2

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As TheLabCat wrotes you can just add a second track to constraint to the earth.

Then you can animate the "influence" values of both constraints as you need it. 0 means no influence 1 means "full" influence. So you should animate the value for your moon constraint from 1 to 0 and at the same time the value from the earth constraint from 0 to 1.

For the animation, use the object constraint "follow path", choose your path and insert keyframes in offset for value 0 and -100.

video tutorial here: https://youtu.be/qFv25Up6LzE

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you can cross fade an animation in VSE.

Open VSE. Insert both movie strips or images sequences. Move them in that way that they do overlap. Select both. Then Shift-A -> Transition -> Cross. By moving the strips you can lengthen/shorten the crossfade-effect.

video tutorial for cross-fading: https://youtu.be/KgiXJvW5tvk

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  • $\begingroup$ I need just a little more guidance - I added the 2nd Object Constraint on the camera and I can see how influence changes the camera but I don't know how to animate the influence for a cross fade. $\endgroup$
    – Jon
    Commented Sep 7, 2021 at 12:44
  • $\begingroup$ you can cross fade this in VSE, i just made a tutorial about it. I will put the link in here. But honestly...these are now 3 questions in one post. Normally you should have only one question per post. $\endgroup$
    – John MC
    Commented Sep 8, 2021 at 9:44
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I see this is 2 years old but I'll throw an answer in just in case anyone comes cross it.

When you fade from 1 Track To to another you need them to both share the same frame where one has an influence of 1 and the other has an influence of 0. Move along the time line a few frames and then change the influence of the first to 0 and the second to 1. If you press the record button above the timeline before setting the influence, it will automatically add a keyframe for each of the times you changed the influence setting.

This will create a pan to movement across those frames. If you want the camera to immediately snap straight from object to another object with the Track To just make sure the influence change from 1 to 0 and 0 to 1 happens in the space of just two frames.

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