NAME
	  glClearDepth - specify the clear value for the depth buffer


     C SPECIFICATION
	  void glClearDepth( GLclampd depth )


     PARAMETERS
	  depth	 Specifies the depth value used	when the depth buffer
		 is cleared. The initial value is 1.

     DESCRIPTION
	  glClearDepth specifies the depth value used by glClear to
	  clear	the depth buffer.  Values specified by glClearDepth
	  are clamped to the range [0,1].

     ERRORS
	  GL_INVALID_OPERATION is generated if glClearDepth is
	  executed between the execution of glBegin and	the
	  corresponding	execution of glEnd.

     ASSOCIATED	GETS
	  glGet	with argument GL_DEPTH_CLEAR_VALUE

     SEE ALSO
	  glClear