2017

Horizontal Size Offset field Displays the horizontal size offset (expansion or restriction) of the surface while
respecting the surface shape. Editable.
Proportional button Enable to change the size offset fields proportionally.
Extrapolation box Available for extended bicubic surfaces only, and when the size offset fields are not at
0. Select Linear to extrapolate the surface in a straight direction. Select Smooth to extrapolate smoothly
based on the position of the vertices of the surfaces.
Crop button Enable to restrict a bilinear surface to the dimensions of the UV points.
You can crop the parts of the image that are outside of the geometry, or let the texture go beyond the surface
wireframe, by enabling the Crop button.
Rendering Section
Filter box Select the type of filtering to apply to the surface. For example, to be able to mix various ratios
in an Action setup, such as a PAL image in a 1080 HD setup, requires filtering.
To apply:Select:
No filtering — the pixel of the texture closest to the screen pixel is displayed.Nearest
Basic bilinear filtering.Linear
Non-proportional filtering between X and Y (faster to process than EWA, but with
a lesser quality).
Anisotropic
A combination of Anisotropic and Linear filtering.Aniso+Linear
A high-quality elliptical weighted average filter that determines the proportions
of an elliptical area around every pixel to perform a weighted sampling of the
EWA
colours (slower to process than other filters). EWA is always calculated in screen
space, so you should always view the result with a 100% zoom factor.
A combination of EWA and Linear filtering (offers the most advanced filter pro-
cessing).
EWA+Linear
EWA and Anisotropic filtering are especially useful to deal with rotations and perspective effects.
The majority of the filters do not alter the image in any way if you have not moved it, or if you move it in
actual pixel increments. The only exception is the EWA+Linear filter which always filters the image, even
if you have not moved it (inherent to this type of filtering).
Surface Resolution field Displays the geometry resolution of the selected surface. By default, the value is
equal to the default Action Resolution setting (in the Rendering section of the Setup menu).
The lower the value, the better the resolution and the greater the processing time required to interact with
the image. For example, a value of 1 on an NTSC image creates a mesh with 720 horizontal and 486 vertical
subdivisions on the selected surface, affording accurate displacement, normals, and lighting.
Wireframe button Enable to convert the selected surface to a wireframe representation (lighting and
transparency properties are kept).
Motion Blur button Enable to use motion blur for the selected surface (can only be used if the global Motion
Blur is enabled in the Action Setup menu).
504 | Chapter 15 Compositing in 3D Space with Action