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When click!!
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(void) glRenderMode (GL_SELECT); glInitNames(); glPushName(0); glMatrixMode (GL_PROJECTION); glPushMatrix (); glLoadIdentity (); gluPickMatrix ((GLdouble) x, (GLdouble) (viewport[3] - y), 20.0, 20.0, viewport); gluOrtho2D (0.0, 3.0, 0.0, 3.0); drawSquaresSelect(); glMatrixMode (GL_PROJECTION); glPopMatrix (); glFlush (); hits = glRenderMode (GL_RENDER); Define view volume Draw selection Buffer Draw your quad in this function again, and before drawing, use LoadName() and PushName() to assign a distinct name to the quad.
![(void) glRenderMode (GL_SELECT); glInitNames(); glPushName(0); glMatrixMode (GL_PROJECTION); glPushMatrix (); glLoadIdentity (); gluPickMatrix ((GLdouble) x, (GLdouble) (viewport[3] - y), 20.0, 20.0, viewport); gluOrtho2D (0.0, 3.0, 0.0, 3.0); drawSquaresSelect(); glMatrixMode (GL_PROJECTION); glPopMatrix (); glFlush (); hits = glRenderMode (GL_RENDER); Define view volume Draw selection Buffer Draw your quad in this function again, and before drawing, use LoadName() and PushName() to assign a distinct name to the quad.](http://images.slideplayer.com./15/4840810/slides/slide_6.jpg "(void) glRenderMode (GL_SELECT); glInitNames(); glPushName(0); glMatrixMode (GL_PROJECTION); glPushMatrix (); glLoadIdentity (); gluPickMatrix ((GLdouble) x, (GLdouble) (viewport[3] - y), 20.0, 20.0, viewport); gluOrtho2D (0.0, 3.0, 0.0, 3.0); drawSquaresSelect(); glMatrixMode (GL_PROJECTION); glPopMatrix (); glFlush (); hits = glRenderMode (GL_RENDER); Define view volume Draw selection Buffer Draw your quad in this function again, and before drawing, use LoadName() and PushName() to assign a distinct name to the quad.")
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This point’s coordinate is near (0.5,0.25)
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When click, program knows which vertex is clicked.
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