gluProject与gluUnProject
gluProject
The gluProject function maps object coordinates to window coordinates.
int gluProject( GLdouble objx, GLdouble objy, GLdouble objz, const GLdouble modelMatrix[16], const GLdouble projMatrix[16], const GLint viewport[4], GLdouble *winx, GLdouble *winy, GLdouble *winz );
Parameters
- objx, objy, objz
- The object coordinates.
- modelMatrix
- The current modelview matrix (as from a glGetDoublev call).
- projMatrix
- The current projection matrix (as from a glGetDoublev call).
- viewport
- The current viewport (as from a glGetIntegerv call).
- winx, winy, winz
- The computed window coordinates.
Remarks
The gluProject function transforms the specified object coordinates into window coordinates using modelMatrix, projMatrix, and viewport. The result is stored in winx, winy, and winz. A return value of GL_TRUE indicates success, and GL_FALSE indicates failure.
gluUnProject
The gluUnProject function maps window coordinates to object coordinates.
int gluUnProject( GLdouble winx, GLdouble winy, GLdouble winz, const GLdouble modelMatrix[16], const GLdouble projMatrix[16], const GLint viewport[4], GLdouble *objx, GLdouble *objy, GLdouble *objz );
Parameters
- winx, winy, winz
- The window coordinates to be mapped.
- modelMatrix
- The modelview matrix (as from a glGetDoublev call).
- projMatrix
- The projection matrix (as from a glGetDoublev call).
- viewport
- The viewport (as from a glGetIntegerv call).
- objx, objy, objz
- The computed object coordinates.
Return Values
If the function succeeds, the return value is GL_TRUE.
If the function fails, the return value is GL_FALSE.
Remarks
The gluUnProject function maps the specified window coordinates into object coordinates using modelMatrix, projMatrix, and viewport. The result is stored in objx, objy, and objz.
Requirements
Windows NT/2000: Requires Windows NT 3.5 or later.
Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
Header: Declared in Glu.h.
Library: Use Glu32.lib.
源自：http://blog.sina.com.cn/s/blog_4bb59dc401016gwr.html