1991-2006 Silicon Graphics, Inc. gluProject 3G gluProject map object coordinates to window coordinates GLint gluProject GLdouble objX GLdouble objY GLdouble objZ const GLdouble * model const GLdouble * proj const GLint * view GLdouble* winX GLdouble* winY GLdouble* winZ objX objY objZ Specify the object coordinates. model Specifies the current modelview matrix (as from a glGetDoublev call). proj Specifies the current projection matrix (as from a glGetDoublev call). view Specifies the current viewport (as from a glGetIntegerv call). winX winY winZ Return the computed window coordinates. gluProject transforms the specified object coordinates into window coordinates using model, proj, and view. The result is stored in winX, winY, and winZ. A return value of GLU_TRUE indicates success, a return value of GLU_FALSE indicates failure. To compute the coordinates, let v = objX objY objZ 1.0 represented as a matrix with 4 rows and 1 column. Then gluProject computes v ″ as follows: v ″ = P × M × v where P is the current projection matrix proj and M is the current modelview matrix model (both represented as 4 × 4 matrices in column-major order). 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 gluUnProject, glGet Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.