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1634 Chapter 16: Material Editor, Materials, and Maps
Mono Channel Output group
Some parameters, such as opacity or specular
level are a single value as opposed to a material’s
three-value color components. Controls in this
group determine the source of the Output mono
channel in terms of the input bitmap.
RGB Intensity—Uses the intensity of the red, green,
and blue channels for mapping. The color of the
pixels is ignored and only the value or luminance
ofthepixelsisused.Thecolorsarecomputedas
gray values in the range between 0 (black) and 255
(white).
Alpha—Uses the intensity of the alpha channel
(page 3–907) for mapping.
RGB Channel Output group
The RGB Channel Output determines where the
output RGB part comes from. The controls in this
group affect only maps for material components
that display color: Ambient, Diffuse, Specular,
Filter Color, Reflection, and Refrac tion.
RGB—Displays the full color values of the pixels.
(Default)
Alpha as Gray—Displays tones of gray based on the
levels of the alpha channel.
Cropping/Placement group
Thecontrolsinthisgroupletyoucropthe
bitmap or reduce its size for custom placement.
Cropping a bitmap means to reduce it to a smaller
rectangular area than it originally had. Cropping
doesn’t change the scale of the bitmap.
Placing a bitmap lets you scale the map and place
it anywhere within its tile. Placing can change
thebitmap’sscale,butshowstheentirebitmap.
The four values that specif y the placement and
size of the cropping or placement region are all
animatable.
Cropping and placement settings affect the bitmap
only as it’s used for this map and any instances of
the map. They have no effect on the bitmap file
itself.
Apply —Turn on to use the cropping or placements
settings.
View I ma ge—Displays a rendered frame window
(page 3–5) that shows the bitmap surrounded by
aregionoutline. Theregionoutlinehashandles
atitssidesandcorners.Whencroppingison,
dragging the hand les changes the size of the crop
area. You can also drag within the region area to
move it.
The frame window has U/V and W/H
(width/height)spinnersonitstoolbar.Usetheseto
adjust the location and size the image or crop area.
When Place is turned on, dr agging the region
area handles changes the scale of the bitmap (hold
down
Ct rl to preserve the bitmap’s aspect ratio),
and dragging the image changes its location within
thetilearea.
When Crop is turned on, the UV or XY button at
the right of the rendered frame window toolbar lets
you switch between using U V or XY coordinates
in the toolbar spinners. Also, you can zoom out by
pressing
Shif t+Z and zoom in by pressing Z .
Cr o p —Makescroppingactive.
Place—Makes placement active.
U/V—Adjusts the bitmap location.
W/H—Adjusts the width and height of the bitmap
or crop area.
Jitter Pl acement—Specifies the amount of random
offset. At 0, there is no random offset. Range =
0.0 to 1.0
WhenPlaceisturnedon,thesizeandposition
specified by the spinners or editing window are
ignored. The software t hen chooses a random size
andtilepositionfortheimage.