tool. Drag the mask left
and right or up and down to match the mask to the angle of the face in the photo.
The face you have imported may not be facing directly forward. In this
case, adjust the angle of the face slightly using the Roll X-Z
tool. Drag the mask left
and right or up and down to match the mask to the angle of the face in the photo.
The other tools below are:
Home: reset the position and angle of the 3d contour.
Zoom: adjust the scale of the 3d contour.
Pan: move of the 3d contour.
Roll X-Y: roll the 3d contour.
Click the next 
button to proceed to the next stage, Adjusting
feature points and contours.