2017

2 In the Surface menu, change the Surface Offset X and Surface Offset Y fields accordingly.
(a) Surface Offset fields
The following figure illustrates the difference between rotating a surface that has not been offset and
a surface offset using the Surface Offset X field.
Rotated image with an offset along the X-axis. Notice
that the axis is offset from the image centre.
Rotated image with no offset. Notice that the axis is
in the centre of the image.
Reshaping Using the Channel Editor
You can select whether you want to create an animation for bilinear or extended bicubic surfaces using the
Shape channel or individual Vertex channels in the Channel Editor. The Shape channel shows when the
shape of the surface changes during the animation. Each time you move a surface handle, a shape key is
added at the current frame, provided that Auto Key is enabled.
Vertex channels correspond to the vertices—or handles—that appear on the four corners of bilinear and
extended bicubic surfaces. The channel names for each corner are: upper_left, upper_right, lower_left, and
lower_right, and are listed in the channel hierarchy each with a position x,y,z. To use the vertex channels
in the Animation editor, make sure that Shape Channel is disabled in the Vertices or UV Points menu.
Each corner vertex has two tangent handles—the tangent handles for upper_left are named horz_tan_right
and vert_tan_down.
Action Surfaces | 511