Interpolates two saved shots exactly like the offline renderer (timeline_for / interp_camera), and reports what fraction of the city mesh stays inside the frame at each checkpoint — catches a MEM_B-style blank middle (both endpoints look fine, the move loses the city) before anything renders.
Pick two saved shots, then PREVIEW MOVE.
Sweep / Loop
Animates ONE parameter A→B around the CURRENT composed camera/framing/far_mag — everything else held fixed, same idea as the far_mag preview in "Shot" but for full rotations and loops. Checkpoint preview + coverage reuse Move Preview's machinery. A full yaw 0→360 sweep returns exactly to its start — labeled seamless, no palindrome needed.
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Pick a param, set A/B, then PREVIEW SWEEP.
Send to Claude
Downloads a .json. Put it in reverse-perspective\SHOTDESK specs\ and Claude renders it at full quality.