Global Slow-mo effect - Animating Time scale Is there a way to animate the timescale of a scene for a small amount of time?
I'm looking to create an animation, and in the middle it goes from 1.0x speed, to 0.125x speed (1/8th normal speed), but with a smooth transition. So it's start at 1.0x speed, and over the course of 10 frames, for example, it slows down to 0.125x speed for a bit, then goes back to normal speed.
Ideally, I'd just keyframe the time-remapping to do it, but apparently it's not animate-able.
Going into the action editor and changing the scale of the clips won't be viable, as it's important that the whole scene is slowed down (nearly everything in the scene is in motion, so slowing down the main subject won't cut it). So it needs to affect the scene globally.
I've also seen solutions that say to do it in the VSE on another scene with an effect strip (i.e. using the main scene in the VSE as a source, and then attaching an effect strip to it), but it doesn't seem to have any effect on anything when I go back to the main scene. Which kind of makes it pointless as a solution, as you can't iterate on it unless you render, and re-render it after a tweak.
I'd rather not have to render out that section with 8x the frame rate and slow it down in post if I can help it, as that seems rather wasteful.
I'm also sure this could be done easily with animation nodes. But as this is a project with a strict deadline, I can't set aside the time to learn the addon's ins and outs at the moment.
You can do it in the graph editor. Select all elements in the scene and place a locrot keyframe where you want the remapping to start. In the graph editor place the cursor on that frame and select all keyframes only to the right of the cursor. Change pivot point to 2d cursor and scale on x by 8 (s-x-8). Go to where you want the mapping to end and place another keyframe on all elements in the scene, place the cursor on that frame, then select all only to the right and scale on x by 0.125 (s-x-0.125). You then only need to finesse the handles on these keyframes to give you the lead in/lead out you're looking for. Much easier if the scene can jump straight to slo-mo because you can just set handle type to vector for those two frame numbers.
edit: video link https://youtu.be/lxdQogx6y40