9

Common Parameters Rollout (Render Scene Dialog) 31
ratio. When it is on, the Image Aspect spinner
is replaced by a label, and the Width and Height
spinners are locked to each other; adjusting one
alters the other to maintain the aspect-ratio value.
In addition, when the asp ect ratio is locked,
alteringthePixelAspectvaluealterstheHeight
value to maintain the aspect-ratio value.
Note: In viewpor ts, the camera’ s cone changes to
reflect the image aspect ratio you set in the Render
Scene dialog. Th is change takes place when you
exit the Render S cene dialog .
Pixel Aspect—Sets the aspect ratio of the pixels for
display on another device. The image might look
squashed on your display but will display correctly
on the dev ice with differently shaped pixels. If
you use one of the standard formats rather than
Custom, you can’t change the pixel aspect ratio
and this cont rol is disabled.
The lock button to the left of Pixel Aspect
locks the pixel-aspect ratio. When it is on, the
Pixel Aspect spinner is replaced by a label, and you
can’t change the value. This button is available
only with the Custom format.
Images with different pixel aspects a ppear stretched or
squashed on a monitor with square pixels.
Note: For standard NTSC (page 3–980),the
pixel aspect ratio is 0.9. If you are creating 16:9
(0.778) anamorphic images for NTSC, the pixel
aspect ratio should be 1.184. (As in the previous
discussion of Image Aspect, this assumes the
image is not letterboxed.)
Options group
Atmospher ics—Renders any applied atmospheric
effects, such as volume fog, when turned on.
Effects—Renders any applied rendering effects,
such as Blur, when turned on.
Displa cement—Renders any applied displacement
mapping.
Video Color Check—Checks for pixel colors that are
beyond the safe NTSC (page 3–980) or PAL (page
3–988) thresholdandflagsthemormodifiesthem
to acceptable values.
By default, "unsafe" colors render as black pixels.
You can change the color check display by using
the Rendering panel (page 3–826) of the Preference
Settings dialog (page 3–815).
Render t o Fields—Renders to video fields (page
3–938) rather than frames when creating
animations for video.
Render Hi dden Geometry —Renders all geometric
objects in the scene, even if they are hidden.
Area L ights/Shadows as Points—Renders al l area
lightsorshadowsasiftheywereemittedfrom
point objects, speeding up rendering time.
Tip: This is useful for draft renderings, as point
lights render much faster than area lig hts.
Note: Scenes with radiosity (page 3–51) are not
affected by this togg le, as area lights do not have a
significanteffectontheperformanceofaradiosity
solution.
Force 2-Sided—2-Sided rendering (page 3–901)
renders both sides of all faces. Usually, you’ll want
to keep this option off to speed rendering time.
You may want to turn it on if you need to render
the inside as well as the outside of objects, or if