3D Compositing with Action > Action: Masks > Creating a Mask >
Editing the Mask

You can edit the mask gesturally and by modifying the settings in Gmask tabs. Editing operations, such as adding and removing vertices, can be effected whether or not the mask is completed. You can also edit mask properties, move vertices and tangents, add and edit the gradient, track the mask, and change display properties before mask completion.

To add points to a mask:

1. In the Edit Modes box, select Add (A).
2. Do one of the following:
   - Click on a spline between two existing vertices to add a new vertex.
   - Click on the first or last point of an open mask and click where you want to add a new point to continue drawing the mask.

To delete points from the mask:

1. In the Edit Modes box, select Delete (D).
2. Click on a vertex to delete it.

   If the vertex is in a mask that is a closed shape, the splines that connected it to adjacent vertices will be replaced by a single spline.