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Inaccurate picking

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im trying to pock objects in my scene, but it doesnt work accurately. It seems like the object is moved a bit down for the picking - if i click a bit under the object a still pick it and when i click at the top of the object i dont pick it. This is mt selection code : GLuint buffer[512]={0}; GLint viewport[4]={0}; GLint choose; GLint hits; GLint depth; glGetIntegerv(GL_VIEWPORT,viewport); glSelectBuffer(512,buffer); (void) glRenderMode(GL_SELECT); glInitNames(); glPushName(-1); glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity(); gluPickMatrix((GLdouble)MouseX,(GLdouble) (viewport[3]- MouseY),0.1f,0.1f,viewport ); gluPerspective(Config.scnViewAngle_i, (float)(viewport[2] - viewport[0]) / (float)(viewport[3] - viewport[1]),Config.scnNearClip_f ,Config.scnFarClip_f); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); //////////////////////////////////////////////////////////////////// Loop(1);//Draws the scene //////////////////////////////////////////////////////////////////// glMatrixMode(GL_PROJECTION); glPopMatrix(); glMatrixMode(GL_MODELVIEW); hits = glRenderMode(GL_RENDER); if (hits > 0) { choose = buffer[3]; depth = buffer[1]; for (int loop=1;loop

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