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<HTML><BODY><PRE> <STRONG>NAME</STRONG> <STRONG>fgluProject</STRONG> - map object coordinates to window coordinates <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG> INTEGER*4 <STRONG>fgluProject</STRONG>( REAL*8 <EM>objX</EM>, REAL*8 <EM>objY</EM>, REAL*8 <EM>objZ</EM>, CHARACTER*8 <EM>model</EM>, CHARACTER*8 <EM>proj</EM>, CHARACTER*8 <EM>view</EM>, CHARACTER*8 <EM>winX</EM>, CHARACTER*8 <EM>winY</EM>, CHARACTER*8 <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>fgluProject</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>fgluProject</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>fgluUnProject</STRONG></PRE></BODY></HTML>⌨️ 快捷键说明
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