Re:Form remembers how a sculpt was made. Every stroke and every operation is kept as a step, and Timeline shows them as a row of small blocks, one for each step, oldest on the left and Now at the end, with the number of steps above them. Open it with the Timeline button on the top toolbar (a click or a right-click); it stays open while you work until you press the button again. It is always on: there is nothing to switch on and nothing to set.

Timeline is not Undo. Undo (Ctrl+Z) takes back your last few steps one at a time. Timeline reaches back through the whole session and lets you look without changing anything.

Looking back

  • Hover a block to see what that step was: its number, the brush with its size and strength and how many dabs it laid (or the operation), how long ago, and a small picture of the model just after it. Steps from a history opened from a file have no picture.
  • Click a block and the sculpt is rebuilt as it was just after that step; a card counts the steps while it works. The block is outlined, the steps after it are dimmed, and the count above reads where you are, for example Step 12 of 40.
  • Click Now, at the end of the row, and you are back in your sculpt exactly as you left it.
  • Strokes, operations and saved states each have their own colour, so you can see at a glance where the big changes were. A long history scrolls sideways; the mouse wheel scrolls it too.

Looking changes nothing. While an earlier point is on screen, File ▸ Save, the autosaves and File ▸ Save local… still save your sculpt as it is at Now, not the point you are looking at. Undo and Redo wait until you are back at Now.

Carrying on from an earlier point

Sculpt, or make any other edit, while an earlier point is on screen and Re:Form asks one question:

Keep the later work as a separate version?

  • Yes saves everything that came after that point as its own project, named after yours with "(later version)" at the end. If you are not signed in, or your plan has no room for another project, it is downloaded to your computer as a project file instead.
  • No lets the later work go.

Either way you carry on from the point you chose, and the history goes on from there. With a brush, the press that raises the question does not sculpt; your next press does.

What is kept, and where

  • Strokes are kept as the brush dabs themselves, so a step is rebuilt exactly: same brush, same strength, same symmetry.
  • Operations that rebuild the mesh (Remesh, Reflow, Decimate, a Clip cut, merging layers, importing a mesh, finishing a Blockout) are kept as a copy of the project after them.
  • The history is saved beside your project in your account, in its own file, on every Save and autosave. It is never inside the project file, so projects stay the size they are and open as fast as they do.
  • The history has its own size limit: half your plan's project size. Past it, the history starts again from the sculpt as it is at that moment. Nothing is shown and nothing stops; your sculpt is not affected, only how far back Timeline can reach.
  • A project saved before Timeline existed starts its history the first time you open it.

Good to know

  • Coming back to Now clears Undo: the steps before you looked back can no longer be undone one by one. Use Timeline to reach them instead.
  • To make scrubbing quick, Re:Form keeps copies of the sculpt at intervals in your browser's own storage. They are only a cache: if the browser clears them, they are made again the next time you scrub.
  • Timeline needs the GPU engine. On the CPU engine the row stays empty.