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A practical guide · Motion

Keep Duo motion continuous between shots

Match the previous effect’s End to the next Start across camera, fold and scene state, then review the boundary at normal speed.

Partially folded Night Sky iPhone Duo with illuminated metal edges in a dark studio
Continuous Duo motion depends on matching more than the visible fold angle.

The next shot should begin where the previous move ends when the sequence is meant to flow continuously. Compare the whole pose and scene, not just one rotation value.

Try it in SynthMock

Start with a Duo scene.

Use a reusable template as your starting point, then apply the choices in this article.

A paid plan is required to use templates and export.

Compare the complete boundary state

A camera jump can come from Tilt, Roll, Pan, Zoom or FOV. A physical jump can come from Fold. A visual flash can come from a different finish, source image, reflection strength or background. Matching only Tilt Y leaves many ways for the boundary to feel wrong.

Select the previous effect’s End and note the relevant values. Then select the next effect’s Start. The new-shot workflow can inherit continuity, but later endpoint edits can change it, so inspect the result after revising the earlier shot.

StateBoundary check
CameraTilt X/Y, Roll, Pan X/Y, Zoom and FOV
DeviceFold and Finish
AppearanceSources, lighting, reflections and background
TimingNo unintended gap between the ranges

Repair the start without flattening the next move

The new shot can still have a very different ending pose. Continuity concerns where it begins; it does not require every shot to repeat the same angle.

  1. Pause at the previous effect’s End and inspect the full state.
  2. Select the next effect’s Start and align any mismatched values.
  3. Leave the next End as the intended destination unless it also needs revision.
  4. Scrub just before and just after the shot boundary.
  5. Play through the boundary at normal speed and check the full new move.

Position continuity is only the first check

Even with identical boundary poses, two easing curves can create a stop or a sudden change in perceived speed. Decide whether that pause is a deliberate reading moment. If the move should feel continuous, adjust the neighboring curves and durations together.

Source videos and moving backgrounds can also jump while the phone’s geometry stays continuous. Review those separately. Finish with a downloaded MP4 check, since the complete delivery is what matters rather than two paused endpoint previews.

See a Duo sequence in motion

A 14.85-second Duo animation exported from SynthMock, showing the cover, hinge and open display with the default artwork. Silent video.

Final pass

Before you call it finished

  • Adjacent End and Start states match where continuity is intended.
  • The movement’s speed change at the boundary feels deliberate.
  • Sources and background do not introduce an unintended flash or jump.

Make the next version yours.

Explore Duo templates