Sophie: Io-language-graphics-and-sound-20080330-6.fc15 i686

Io-language-graphics-and-sound-20080330-6.fc15.i686.rpm

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     <STRONG>NAME</STRONG>
	  <STRONG>gluProject</STRONG> - map object coordinates to window	coordinates


     <STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG>
	  GLint	<STRONG>gluProject</STRONG>( GLdouble <EM>objX</EM>,
			    GLdouble <EM>objY</EM>,
			    GLdouble <EM>objZ</EM>,
			    const GLdouble *<EM>model</EM>,
			    const GLdouble *<EM>proj</EM>,
			    const GLint	*<EM>view</EM>,
			    GLdouble* <EM>winX</EM>,
			    GLdouble* <EM>winY</EM>,
			    GLdouble* <EM>winZ</EM> )


     <STRONG>PARAMETERS</STRONG>
	  <EM>objX</EM>,	<EM>objY</EM>, <EM>objZ</EM>
			  Specify the object coordinates.

	  <EM>model</EM>		  Specifies the	current	modelview matrix (as
			  from a <STRONG>glGetDoublev</STRONG> call).

	  <EM>proj</EM>		  Specifies the	current	projection matrix (as
			  from a <STRONG>glGetDoublev</STRONG> call).

	  <EM>view</EM>		  Specifies the	current	viewport (as from a
			  <STRONG>glGetIntegerv</STRONG>	call).

	  <EM>winX</EM>,	<EM>winY</EM>, <EM>winZ</EM>
			  Return the computed window coordinates.

     <STRONG>DESCRIPTION</STRONG>
	  <STRONG>gluProject</STRONG> transforms	the specified object coordinates into
	  window coordinates using <EM>model</EM>, <EM>proj</EM>,	and <EM>view</EM>. The result
	  is stored in <EM>winX</EM>, <EM>winY</EM>, and <EM>winZ</EM>. A return value of <STRONG>GL_TRUE</STRONG>
	  indicates success, a return value of <STRONG>GL_FALSE</STRONG>	indicates
	  failure.

	  To compute the coordinates, let v=(objX,objY,objZ,1.0)
	  represented as a matrix with 4 rows and 1 column.  Then
	  <STRONG>gluProject</STRONG> computes v' as follows:

	  v' = P x M x v

	  where	P is the current projection matrix <EM>proj</EM>, M is the
	  current modelview matrix <EM>model</EM> (both represented as 4x4
	  matrices in column-major order) and 'x' represents matrix
	  multiplication.

	  The window coordinates are then computed as follows:

	  winX = view(0) + view(2) * (v'(0) + 1) / 2

	  winY = view(1) + view(3) * (v'(1) + 1) / 2

	  winZ = (v'(2)	+ 1) / 2


     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>
	  <STRONG>glGet</STRONG>, <STRONG>gluUnProject</STRONG>











































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