https://www.stalliongaming.com/blog/knowing-keyframe-animation-and-using-it-in-videos/

Keyframe Animation – SketchUp easy and intutive

Bring your SketchUp model to life by adding movement to any object.
Keyframe Animation makes animating objects in SketchUp easy and intutive. Ordinary scenes act as keyframes. for every scene, just place the objects where you would like them to be, and click on the Record button. When a scene is chosen , the objects will magically translate, rotate, and scale to their recorded values.
Object Interpolation
Keyframe Animation figures out the simplest thanks to interpolate objects between keyframes.
The way Keyframe Animation animates objects depends on how their location, orientation, and size changes. Objects are often interpolated by translation, rotation, scale, reflection, inversion, or a mixture .
If the move tool is employed to vary the situation , then the thing is interpolated by translation along a line .
If the rotation tool is employed to vary the situation and orientation, then the thing is interpolated by rotation about the acceptable axis, through the smaller angle (i.e. the one but or adequate to 180 degrees).
If the dimensions tool is employed to vary the size, then the thing is interpolated by scaling it along each component axis.
If an object is flipped along one among its axes (context menu , that reflects it. this is often interpolated by moving every point along a line that passes through a “mirror plane” within the middle, to some extent an equal distance on the opposite side, reflecting the thing within the process.
If an object is flipped along all three component axes (i.e. red, green, and blue), that inverts it. this is often interpolated by moving every point along a line that passes through the middle to some extent an equal distance on the opposite side (i.e. its antipodal point). This inverts the thing within the process.
Animating Nested Objects Keyframe Animation
Objects contained inside other objects also can be animated at any depth.
An object are often either a gaggle or a component. If an object is contained inside another object, then it moves relative to its parent. If the parent also moves, the mixture of translations and rotations may result in additional complex sorts of motion.
Exporting the Animation
Once your animation is about up, you’ll export it to a typical video, custom video, or a picture sequence.
SketchUp features a utility to export animations, but it only exports its own built-in animation of the scene properties, and ignores the thing animation. However, Keyframe Animation 2.0 features a utility to export both the scene Keyframe Animation and therefore the object animation.
Backward Compatibility with Version 1.9
Convert animations in version 1.9 format to version 2.x format, quick and straightforward .
If you see a grayed out toolbar, like this .it is NOT a bug.
That just means your model has position data recorded in version 1.9 format. what’s happening under the hood in version 2 is so different that a version 1.9 animation won’t run. If you open a model with version 1.9 position data, then all of the commands on the toolbar — except the assistance button — are going to be disabled.
However, there’s a simple solution. Version 2.1 features a utility which will convert any Keyframe Animation from version 1.9 format to version 2.x format. Access is from the menu item, Animation > Convert v1 to v2.
The version 2.x compatible animation is made during a new model. you’ll reserve it with any name you would like . the first model isn’t modified.
Once the new model is open, your old animation will add Keyframe Animation 2, and every one the toolbar buttons and menu items are going to be enabled normally.