<p>H3 can already do this. The socket is right there on the node and almost nobody plugs anything into it.</p><p>Normally you hand the model one picture and it decides where the shot goes. Here you hand it <strong>both ends</strong>: the frame you want it to start on, and the frame you want it to finish on. It makes the journey between them.</p><div data-youtube-video><iframe width="640" height="480" allowfullscreen="true" autoplay="false" disablekbcontrols="false" enableiframeapi="false" endtime="0" ivloadpolicy="0" loop="false" modestbranding="false" origin playlist src="https://www.youtube.com/embed/HxZmTVA8P4I" start="0"></iframe></div><h3 id="how-to-use-it">How to use it</h3><ol><li><p>Load your first picture into the first image slot.</p></li><li><p>Load your last picture into the <code>last_frame</code> slot.</p></li><li><p>Write what <em>happens</em> between them, not what the picture looks like.</p></li><li><p>Run it.</p></li></ol><h3 id="the-one-rule-that-catches-everybody">The one rule that catches everybody</h3><p>Both pictures have to be the <strong>same pixel size</strong>, and the clip has to be that same shape too.</p><p>If they do not match, nothing warns you. It does not crop and it does not letterbox. It <strong>stretches</strong>, and your subject quietly comes out wider or taller than she should be. I shipped that mistake once before I understood it, so the workflow now renders at the same shape as the demo pictures rather than a default widescreen size.</p><h3 id="a-trick-worth-knowing">A trick worth knowing</h3><p>For a smooth push in, use the <strong>same picture twice</strong>: once as it is, and once cropped tighter and scaled back to the identical size. You get one continuous move on one face.</p><p>Two different people as your two ends is the classic way to get a face that morphs into someone else halfway through. If that is not what you want, keep it to one.</p><h3 id="what-is-in-the-file">What is in the file</h3><p>Stock ComfyUI H3 nodes only. Nothing custom, nothing of mine you would have to install. Drop it in and it runs.</p><p>My other free workflows and the written guides are <a target="_blank" rel="ugc" href="https://forgebun.com/go/civit_h3_workflows">over here</a> if you want them.</p>

MiniMax H3 first and last frame - hand it both ends of the shot

<p>First and last frame, at 608 x 1088. That size is on purpose: it matches the shape of the demo pictures, because a pair that does not match the render shape gets stretched rather than cropped.</p>

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