NAME
	  DtGroupIsValid - Get the state of the	valid bits for the
	  given	group of a shape object.


     SYNOPSIS
	  #include <Dt.h>


	  int  DtGroupIsValid( int shapeID, int	groupID, int valid_bit )


     DESCRIPTION
	  DtGroupIsValid() returns 1 if	none of	the attributes of a
	  group	indicated by groupID of	the shape indicated by shapeID
	  have changed for the current frame, otherwise	it returns 0.
	  The valid_bit	parameter is used to check if any or all
	  attributes of	the shape have changed.	 The following
	  attributes can be checked to see if they have	change from
	  the previous frame:

	  DT_FACE   - face vertex, normal or texture vertex indicies.
	  DT_FACE_VERTEX_INDEX - face vertex indicies
	  DT_FACE_NORMAL_INDEX - normal	indicies
	  DT_FACE_TEXTURE_INDEX	- texture vertex indices
	  DT_LINE   - line vertex, normal or texture vertex indicies.
	  DT_LINE_VERTEX_INDEX - line vertex indicies
	  DT_LINE_NORMAL_INDEX - line normal indicies
	  DT_LINE_TEXTURE_INDEX	- line texture vertex indices
	  DT_POINT  - point vertex, normal or texture vertex indicies.
	  DT_POINT_VERTEX_INDEX	- point	vertex indicies
	  DT_POINT_NORMAL_INDEX	- point	normal indicies
	  DT_POINT_TEXTURE_INDEX - point texture vertex	indices








     FILES
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