opengl - GlunUnproject moving object with the mouse -

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i'm trying move objects mouse using gluunproject method opengl 2.1 , i'm struggling here; here's code wrote :

int viewport[4]; double  modelview[16],        projection[16],        x1, y1, z1; double realy;     glfloat depth[2];      for(_compt=_ojebctscene.begin();_compt!=_ojebctscene.end();_compt++)     {      if ((*_compt)->isselected())     {         gldouble mousex=event.x;         gldouble mousey=event.y;        glgetintegerv(gl_viewport, viewport);       glgetdoublev(gl_modelview_matrix, modelview);       glgetdoublev(gl_projection_matrix, projection);       realy = viewport[3] - (glint) mousey - 1;       glreadpixels(mousex, realy, 1, 1, gl_depth_component, gl_float, depth);       gluunproject(mousex, realy, 0, modelview, projection, viewport, &x1, &y1, &z1);       (*_compt)->setx(x1);       (*_compt)->sety(y1);       (*_compt)->setz(z1);     } }

i use loop check objects on scene (i've pushed them vector) , when find selected object , try move using mouse.

i set coordinates of object position of mouse in 3d space (x1 , y1 , z1); doesn't work.

i think i've fixed passing depth[0] gluunproject method. here's i've done , change :

  gluunproject(mousex, realy, 0, modelview, projection, viewport, &x1, &y1, &z1);

by :

  gluunproject(mousex, realy,depth[0], modelview, projection, viewport, &x1, &y1, &z1);

i don't understand means though , if explain me nice.


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