Take Picture 1.0

REQUIREMENTS: VMD Version 1.0 or greater

	Every time take_picture is called, it takes a picture and saves it to
	a file using a picture number that is maintained within
	the body of the procedure. A number of parameters can be sent to
	take_picture to direct its processing.  In particular, the six
	available options are
		(1) reset:  All internal take_picture data is reset to
			    default values
		(2) frame:  Explicitly specifies the number to be included
			    in the numeric placeholder of the filename
			    specification (see 'format' below)
		(3) format: Specifies the naming convention to follow
			    when writing output files.  This uses
			    C-like notation to denote placeholders for
			    numbers (see usage examples)
		(4) method: Specify the type of rendering method to
			    be applied to the current scene.
		(5) exec:   Specifies a Unix command to evaluate
		(6) modulo: Outputs a file once only every modulo calls
			    to take_picture.  This is useful when writing
			    only every nth frame in an animation, for

	take_picture - a generalized procedure for taking screen shots

	*To write all subsequent output files under the names image.00000.rgb,
	 image.00001.rgb, etc.
		take_picture format image.%05d.rgb 
	*To write all subsequent output files in the directory /scratch/disk2
	 under the names snap.0000.rgb, snap.0001.rgb, etc.
		take_picture format /scratch/disk2/snap.%04d.rgb 
	*To output a file only once every 5th time take_picture is called
		take_picture modulo 5 
	*To use Raster3D rendering instead of snapshot and to output using
	 the naming convention animate.0000.r3d, animate.0001.r3d, etc.
		take_picture format animate.%04d.r3d
		take_picture method Raster3d
		take_picture exec {render < %s -sgi %s.rgb} 
	*To return all options to default values
		take_picture reset


	Andrew Dalke (dalke@ks.uiuc.edu)