8
1124 Glossary
Velocity Interpolation
One metho d of interpolation used in
motion flow
editing (page 2–878)
. By default, in a transition
between two motion clips, velocity is interpolated
to blend sm oothly between clips. If transitions are
optimized, then a sophisticated algorithm is used
that m inimizes sliding feet.
Video Safe Frame
Safe frame borders show which portions o f a viewport will
be visible when rendered to video.
TheVideoSafeFrameprovidesaguidetohelp
avoid rendering portions of your image that might
be blocked in the final output.
For example, to ensure that no unintentional
black areas are visible on a television screen,
broadcasters intentionally "overscan" the video
image. Theresultisthatportionsofanimage
aroundtheedgesarenotvisibleonatypicalset.In
addition, portions of images on 35mm slides can
be par tially covered by the slide mounts.
Youcanadjustthesizeofthesafeframeas
apercentageoftheouterdisplayrectangle
withtheSafe-FramecontrolsintheViewport
Configuration dialog. D epending upon its size,
thesafeframecanbeusedastheequivalentofa
"title safe frame" (the area inside which it is safe to
displaytitles),oran"actionsafeframe"(thearea
inside which action may occur without significant
loss of information).
To view the frames, choose Show Safe Frame
from the viewport right-click menu (displayed
when you ri ght-click the viewport label). Three
rectangles,oneyellow,onegreen,andonepale
blue, appear in the camera viewport. The outer,
yellow v ideo rectangle is the area and aspect
ratio of your current display. The middle, green
rectangle is the action safe zone. The inner, p ale
bluerectangleisthetitlesafezone.
Choose Show Safe Frame again to tu rn off the
display.
Viewport (Inter activ e) R enderer
The interactive renderer, used for the viewports,
is designed for speed so you can easi ly manipulate
your objects in a shaded environment. It’s not the
same as the production renderer , which is used for
your final images. Therefore, a number of effects
that are available to the production renderer will
not show up in the viewports.
When you design your m aterials, for example, you
have four levels of visual feedback. The lowest
level is the shaded viewport. The next level is
an ActiveShade viewport (or floater). The next
level is the sample slot, which uses the production
renderer to display the sample sphere. The
highest level is the rendered scene, w hich uses the
production renderer to display the scene.
A single material can contain any number of maps.
Because viewing mapped materials slows the
viewport display, it’s up to you to decide which
map (if any) you want to display. To display a
specific map, you go to that map’s level in the
Material Editor, and then turn on its display.
(If you later go to a different map in the same
material, and turn its display on, the other map is
automatically turned off.)