Panels

Geo Mask

Stick a mask shape to tracked geometry so it follows the shot on its own.

Movie Clip Editor sidebar, Dope Track tab. Needs a clip loaded.

Draw a mask once on one frame, attach it to a piece of tracked geometry, and it follows the camera for the rest of the shot. Instead of keyframing the shape, you let the solve move it.

Everything in this panel acts on the active mask layer, so layers stay independent. Picking a row in the list is how you choose which layer the buttons apply to.

Camera and Geometry

Two pickers, for the projection.

Leave Camera empty and it uses the scene camera, and the panel tells you which one that is. Geometry is the mesh the shape gets cast onto, so it needs to be something that already lines up with the shot.

The layer list

You need an active mask with at least one layer. If there isn't one, the panel says so rather than showing controls that can't work.

Each row shows the layer name and a linked or unlinked icon, so you can see at a glance which layers are attached. Beside the name are a select button and a visibility toggle. The buttons down the side add, remove and rename layers.

Renaming goes through that button rather than being editable in the row, because the Geo Mask data is keyed by layer name and has to move with it.

Linking

What you see depends on whether the active layer is attached yet.

Not linked. The panel says "On the reference frame:" and offers Link Shape to Geometry. Go to the frame where your shape is correct, then press it. The shape is cast onto the mesh and baked across the shot. The button needs both a camera and a geometry picked.

Linked. You get two buttons:

Once linked, you correct drift by moving points on any frame and pressing Set Keyframe. Re-casting from scratch means unlinking first, so the shape can only ever be re-cast from a state you can see.

Keys in Timeline

A toggle that marks your correction keyframes in the timeline, with a colour swatch beside it to pick the colour.

The full walkthrough is in Geo Mask.