When you move vertices, the tangent handles of the two adjacent vertices remain fixed in their current position. You can make them automatically adjust to create smooth curves between the vertices by pressing the G keyboard shortcut as you move vertices.
You can reverse the behaviour so that dragging vertices automatically adjusts tangents without using the keyboard shortcut. You reverse the behaviour by setting the following environment variable:
DL_GMASK_AUTO_MOVE_MODE
To reverse functionality of the G keyboard shortcut:
setenv DL_GMASK_AUTO_MOVE_MODE
When you click or move a vertex on a garbage mask, the tangents are automatically repositioned. When you press
and click or move a vertex, the tangents are not repositioned.