Index for Section 3G

Alphabetical listing for G

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glDepthRange(3G)
NAME
  glDepthRange - specify mapping of depth values from normalized device
  coordinates to window coordinates

SYNOPSIS
  void glDepthRange(
	  GLclampd zNear,
	  GLclampd zFar );

PARAMETERS
  zNear
      Specifies the mapping of the near clipping plane to window coordinates.
      The initial value is 0.

  zFar
      Specifies the mapping of the far clipping plane to window coordinates.
      The initial value is 1.

DESCRIPTION
  After clipping and division by w, depth coordinates range from -1 to 1,
  corresponding to the near and far clipping planes.  glDepthRange()
  specifies a linear mapping of the normalized depth coordinates in this
  range to window depth coordinates. Regardless of the actual depth buffer
  implementation, window coordinate depth values are treated as though they
  range from 0 through 1 (like color components). Thus, the values accepted
  by glDepthRange() are both clamped to this range before they are accepted.

  The setting of (0,1) maps the near plane to 0 and the far plane to 1.	 With
  this mapping, the depth buffer range is fully utilized.

NOTES
  It is not necessary that zNear be less than zFar. Reverse mappings such as
  "zNear" = 1, and "zFar" = 0 are acceptable.

ERRORS
  GL_INVALID_OPERATION is generated if glDepthRange() is executed between the
  execution of glBegin() and the corresponding execution of glEnd().

ASSOCIATED GETS
  glGet() with argument GL_DEPTH_RANGE

SEE ALSO
  glDepthFunc(3), glPolygonOffset(3), glViewport(3)

Index for Section 3G

Alphabetical listing for G

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