Use the modelling tools to define the source mesh so that it outlines the original shape of the image in the front clip.

To define the source mesh for the original image:

1. Go to the first frame of the clip.
2. Click Front Source to define the source mesh for the front clip.
3. Add a mesh over the area to warp and modify its shape to match the original image.
4. If you are using a live-action or moving clip, the source mesh must follow the movement of the image. You can either modify the mesh manually throughout the clip, or use the Stabilizer to track the movement in the clip. See Modifying the Meshes for Live-Action Clips.