1. Split the layers.
First have a clip in which you have the two objects — the original (say, a smartphone) and the one you want to morph into it (say, a cushion). Then, split this clip into two layers — one with each object. Simply duplicate the layer into two.
2. Trim the clips.
You now have two clips, one with each object. You now need to trim each of these to the exact moment when the morph transition will take place. You may need to do some editing work to ensure movements are smooth between the two layers.
3. Mask the objects.
Next, it’s time to set up the morphing between the two shapes. Take the pen tool and draw a mask around the smartphone - if there’s movement, you’ll need to animate it also. Rename the mask to ‘mask phone’ or similar. Repeat this process for the cushion. Enable keyframes for the mask path.
4. Add the morph effect.
Go back to the start of the transition, select ‘object two mask’ and paste on to the object one layer. Mask setting should now show two masks on this layer. Then, set the mask mode for the cushion to ‘none’. Then, select the smartphone and paste onto your cushion morph layer.
5. Set source and destination masks.
Reshape the smartphone into the shape of the cushion using the ‘reshape effect’ from the tools panel. Choose the remote mask as the Source Mask and set the Destination Mask as the shape of the cushion.
6. Transition the objects.
Next you will reshape the contents of the smartphone mask into the shape of the cushion mask using correspondence points. These set which part of one object will be shaped to which part of the other. Adding more correspondence points in After Effects makes this more accurate.
7. Make it invisible.
Now you have a transition which puts the smartphone into the shape of the cushion. Using After Effects tools, you now fade out the smartphone — so as it fills the shape of the cushion it disappears. You now need to repeat steps 5 to 7 for the cushion.
8. Play the transition.
You will now see the smartphone morph into the shape of the cushion on playback. You’ll need to tweak opacity and experiment with the liquify effect to smooth out the transition between the two objects.