•GLdouble
modelMatrix[16];
•GLdouble
projMatrix[16];
•GLint viewport[4];
•
• // Recupero matrici e viewport
•glGetDoublev(GL_MODELVIEW_MATRIX,modelMatrix);
•glGetDoublev(GL_PROJECTION_MATRIX,projMatrix);
•glGetIntegerv(GL_VIEWPORT,viewport);
•
• // ATTENZIONE: ribaltamento Y!!!!!
•sy = viewport[3]-1-sy;