INTERPOLATING SLICER(1)         13 May 1992            INTERPOLATING SLICER(1)
AVS Module  					  Lawrence Berkeley Laboratory

NAME
     interpolating slicer - extract non-integral orthogonal slices from fields.

SUMMARY
	TYPE	mapper
	INPUT
		field 4d/3d/2d (float) any coords scalar/vector

	OUTPUT
		field 3d/2d/1d (float) any coords scalar/vector

	PARAMETERS
		Name		Type		Default		Min/Max
		Slicer Number	integer		0		0..max size.
		Slice Plane	choice		k		i,j,k,l

DESCRIPTION

	Interpolating slicer is similar in function and form to 
	"orthogonal slicer" and "new ortho slicer".  Orthogonal slices
	are extracted from a source dataset.  Refer to the help for those
	modules on the base functionality.

	The difference is that non-integral slicer numbers are permitted.
	In the case of a non-integral slicer number, the output data is
	computed to be a linear average of adjacent slices from the input
	data.

	For example, if a value of 25.4 is used as the slice number, then
	the resulting data would be 60% of slice 25 and 40% of slice 26.

	This module will process 4d/3d/2d fields producing 3d/2d/1d fields,
	respectively.

	This module has proven to be extremely useful in slicing in the
	time domain.


PARAMETERS

	Slice Number - a floating point number representing the slice number
	to be extracted.

	Slice Plane - select which index variable to hold constant.

EXAMPLE

	See the man pages for "orthogonal slicer" and "new ortho slicer."

LIMITATIONS
	Linear interpolation is used for non-integral slice numbers.
	Extending this to higher order interpolants is straightforward,
	however, for all applications used in testing this module, the
	first order interpolant was adequate.

	Only fields of floating point data are presently allowed.  The code
	may be easily extended to handle other data types (byte, integer and
	double).  In early test versions of the code, these routines were
	present (not stubbed out).  They have been stubbed until the next
	limitation is fixed.

	There are some permutations of 4d fields which have not been tested.
	We didn't have any 4d rectilinear or irregular fields to use in
	testing.  Significant effort has been made, via desk checks, to 
	ensure that these cases will be properly handled.


AUTHOR
     Wes Bethel Lawrence Berkeley Lab, 13 May 1992

RELATED MODULES
     orthogonal slicer, new ortho slicer, arbitrary slicer, 
	new arbitrary slicer
	


AVS Module  					  Lawrence Berkeley Laboratory
INTERPOLATING SLICER(1)         13 May 1992            INTERPOLATING SLICER(1)