#!F-adobe-helvetica-medium-r-normal--18*
#!N
#!N #!Rautocam AutoCamera #!N #!N Category #!N #!N #!Lcatren,dxall760 h Rendering #!EL #!N #!N
Function #!N #!N Constructs a camera for viewing an object. #!N
#!N Syntax #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* #!N camera #!EF =
AutoCamera( #!F-adobe-times-bold-r-normal--18* object, direction, width, resolution, #!N aspect, up, perspective, angle,
background #!EF ); #!EF #!N #!N #!EC #!N #!N Inputs #!T,1,91,276,461,646
#!F-adobe-times-medium-r-normal--14* #!F-adobe-times-bold-r-normal--18* #!N TAB Name TAB Type TAB Default TAB Description
#!EF #!N TAB object TAB object or vector TAB none TAB
object to be looked at #!N TAB direction TAB vector, string,
or object TAB "front" TAB position of camera #!N TAB width
TAB scalar or object TAB input dependent TAB width of field
of view #!N TAB resolution TAB integer TAB 640 TAB pixels
across image #!N TAB aspect TAB scalar TAB 0.75 TAB height/width
#!N TAB up TAB vector TAB [0 1 0] TAB up
direction #!N TAB perspective TAB flag TAB 0 TAB 0: orthographic
projection #!N TAB - TAB - TAB - TAB 1: perspective
projection #!N TAB angle TAB scalar TAB 30.0 TAB view angle
(in degrees) (for #!N TAB - TAB - TAB - TAB
perspective projection) #!N TAB background TAB vector or string TAB "black"
TAB image background color #!N TAB - TAB - TAB -
TAB #!EF #!N #!N Outputs #!T,1,161,321,646 #!F-adobe-times-medium-r-normal--14* #!F-adobe-times-bold-r-normal--18* #!N TAB Name
TAB Type TAB Description #!EF #!N TAB camera TAB camera TAB
resulting camera #!N TAB - TAB - TAB #!EF #!N #!N
Functional Details #!N #!N This module differs from Camera in specifying
a #!F-adobe-times-medium-i-normal--18* direction #!EF from which to view a specified object.
(Camera specifies a "look-from" #!F-adobe-times-medium-i-normal--18* point #!EF .) It will automatically
create an appropriate Camera for a given object for use with
Display or Render. #!N #!I0 #!N #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18*
object #!EF #!EF #!I50 #!N is the object for which a
camera is to be created. You can specify this parameter as
a 3-dimensional position in space. In that case, #!F-adobe-times-bold-r-normal--18* width #!EF
must also be explicitly specified (see below) as a numeric value,
since the module has no means of estimating object size. #!N
#!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* direction #!EF #!EF #!I50 #!N specifies the
direction from the camera eye to the center of the object
and can be any of the following strings: "front," "back," "left,"
"right," "top," "bottom," and their corresponding "off" values ("off-front," "off-back," etc.,
which are all slightly offset from the direct positions). Hyphens and
spaces are not required for the offset (i.e., "offleft" and "off
left" are both valid, and Data Explorer ignores capitalization. #!N #!N
The direction "front" means from the positive #!F-adobe-times-medium-i-normal--18* z #!EF direction;
"back" means from the negative #!F-adobe-times-medium-i-normal--18* z #!EF direction; "left" means
from the negative #!F-adobe-times-medium-i-normal--18* x #!EF direction, "top" means from the
positive #!F-adobe-times-medium-i-normal--18* y #!EF direction, and so on. Note: This parameter
controls only the direction of viewing; it does not allow you
inside the object. For interior views, use the ClipPlane or ClipBox
module, make the object translucent, or use the Camera module in
perspective mode. #!N #!N This parameter can also be specified as
a vector to be added to the look-to point. You can
use the Direction module for constructing look-from directions. But note that
only the direction of the parameter is important; its magnitude does
not affect the size of the object in the image. #!N
#!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* width #!EF #!EF #!I50 #!N specifies the
width of the image in the units of #!F-adobe-times-bold-r-normal--18* object #!EF
. #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* resolution #!EF #!EF #!I50 #!N
specifies the width of the image in pixels. #!N #!I0 #!N
#!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* aspect #!EF #!EF #!I50 #!N specifies the height-to-width ratio
of the image. #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* up #!EF #!EF
#!I50 #!N specifies a vector that will be aligned with the
vertical axis of the image. The default is [0 1 0].
#!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* perspective #!EF #!EF #!I50 #!N specifies
the method of projection used in rendering #!F-adobe-times-bold-r-normal--18* object #!EF .
The choices are perspective (0) and orthographic (1). #!N #!I0 #!N
#!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* Perspective projection #!EF #!I50 #!N This method
produces a realistic rendering of objects, but does not preserve the
exact shape and measurements of the object (e.g., parallel lines usually
do not project as being parallel). The camera is positioned at
the vertex of the viewing angle (see #!F-adobe-times-bold-r-normal--18* angle #!EF below).
The base of this angle is determined by the #!F-adobe-times-bold-r-normal--18* width
#!EF parameter. Thus the actual camera position is determined by #!F-adobe-times-bold-r-normal--18*
width #!EF and #!F-adobe-times-bold-r-normal--18* angle #!EF along the #!F-adobe-times-bold-r-normal--18* direction #!EF
vector. #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* Orthographic projection #!EF #!I50 #!N This
method produces a somewhat artificial view of an object (the distance
between the front and back of an object appears small compared
to the distance between the object and the camera), but it
preserves exact scale measurements and parallel lines. #!N #!N The #!F-adobe-times-bold-r-normal--18*
angle #!EF parameter has no effect on orthographic projection. The size
of the object can be changed only by #!F-adobe-times-bold-r-normal--18* width #!EF
(the default is a field of view slightly greater than the
width of the object). #!I0 #!N #!N For more information on
these projection methods, consult a text on computer graphics. #!N #!I0
#!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* angle #!EF #!EF #!I50 #!N specifies the viewing
angle in degrees for perspective projection. #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18*
background #!EF #!EF #!I50 #!N specifies the color of the image
background as either an RGB color or a color-name string. The
string can be any of the defined color-name strings (see #!Lcolor,dxall792 h Color #!EL
). #!I0 #!N #!N #!N #!N Example Visual Programs #!CForestGreen #!N
#!N #!F-adobe-courier-bold-r-normal--18* #!N MovingCamera.net #!N PlotLine.net #!N PlotTwoLines.net #!N UsingCompute.net #!N
UsingMorph.net #!EF #!N #!N #!EC #!N #!N See Also #!N #!N
#!Lcamera,dxall780 h Camera #!EL , #!Lcolor,dxall792 h Color #!EL , #!Ldirect,dxall806 h Direction #!EL , #!Lrender,dxall923 h Render #!EL , #!Ldisplay,dxall807 h Display #!EL #!N #!N
#!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Lautocol,dxall772 h AutoColor #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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