8

Viewport Background Dialog 41
Files—
Displays the Select Background Image
dialog (p age 1–42)
,whichletsyouselectafileor
sequence of files for your background.
Devices—DisplaystheSelectImageInputDevice
dialog. This lets you use a background from a
digital device. (No device is supported by the
default 3ds Max installation.)
Use Env ironment B a ckgr ound—Lets you display
in the viewports the map you’ve assigned as your
environment background. If no environment
map has been assigned in the Environment
dialog, or Use Map i n that dialog is off, then the
Use Environment Background check box is not
available.
Animation Synchroniz ation group
Controls how sequences of images (for example,
from
IFL (page 3–666) , AVI (page 3–658) ,or
FLC (page 3–662) files) are s ynchronized to the
viewport for
rotoscoping (page 3–1097) .
Use Fra me—The first field sets the first frame of the
incoming sequence that you want to use, and the
second field sets the last one.
Step—S ets the interval between the frames you
want to use. For example, if this spinne r is set to 7,
3ds Max uses every seventh frame.
Start At—Specifies the frame number at which you
want the first input frame to appear . What happens
in the viewport before the start frame depends
on the option you choose for "Start Processing,"
below.
Sync Start To Frame—Determines which frame
from your incoming sequence is displayed at the
Start At frame. For example, you could have a
30-frame
.ifl sequence that starts in your scene at
frame10,butyoucouldusethe5thframefromthe
.ifl on frame 10 by setting Sync Start to 5.
Start Processing group
Determines w hat happens in the viewpor t
background be fore the start frame.
Blank Before Start—Makes the viewport
background blank before the start frame.
Hold B efore St ar t—Specifie s that the viewport
background will contain the start frame.
End Processing group
Determines w hat happens in the viewpor t
backgro und after the last input frame.
Blank After End—Makes the viewport background
blank after the last input frame.
Hold Af ter End—Specifies that the viewport
background will contain the last input frame until
the last frame in the animation.
Loop Af ter End—Specifies that the viewport
background will loop from the end frame back to
the st art frame, ad infinitum.
Aspect Ratio group
Controls the proportions of the viewport
background by matching it to the bitmap,
rendering output, or to the viewpor t itself.
Match V iewport—Changes the aspect ratio (page
3–1005)
of the image to match the aspect ratio of
the viewport.
Match Bitmap—Locks the aspe ct ratio of the image
to the native a spect r atio of the bitmap.
Match R endering Output—Changes the aspect
ratiooftheimagetomatchtheaspectratioofthe
currently chosen rendering output device.
Note: When the Match Bitmap or Match Rendering
Output option is chosen, 3ds Max centers the
imageandclearstheedgesoftheviewporttothe
background color.