does anybody know if their is a possibility to go the graphic pipeline backwards?
Following problem:
Given a pixel (x,y) of the current pixel buffer.
Retrieve its primitiv coordinate after projection or even better in worldview coordinates.
I hope someone can give me hints for this problem
thx
nicolas
NiCo1
2
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 );
The format of these arguments is the same as if they were obtained from glGetDoublev and glGetIntegerv.
note: when using glut mouse function, winy starts from the top while in opengl winy starts from the bottom of the screen.
Nico