- vector<GL::SelectRecord> select_buf;
- GL::select_buffer(select_buf);
- GL::render_mode(GL::SELECT);
-
- glPushMatrix();
- glLoadIdentity();
-
- double clip[4];
- clip[0] = 1;
- clip[1] = 0;
- clip[2] = x-size;
- clip[3] = 0;
- glClipPlane(GL_CLIP_PLANE0, clip);
- glEnable(GL_CLIP_PLANE0);
-
- clip[0] = -1;
- clip[2] = -(x+size);
- glClipPlane(GL_CLIP_PLANE1, clip);
- glEnable(GL_CLIP_PLANE1);
-
- clip[0] = 0;
- clip[1] = 1;
- clip[2] = y-size;
- glClipPlane(GL_CLIP_PLANE2, clip);
- glEnable(GL_CLIP_PLANE2);
-
- clip[1] = -1;
- clip[2] = -(y+size);
- glClipPlane(GL_CLIP_PLANE3, clip);
- glEnable(GL_CLIP_PLANE3);
-
- glPopMatrix();
-
- scene.render(0);
-
- glDisable(GL_CLIP_PLANE0);
- glDisable(GL_CLIP_PLANE1);
- glDisable(GL_CLIP_PLANE2);
- glDisable(GL_CLIP_PLANE3);
-
- GL::render_mode(GL::RENDER);
- Track3D *track = 0;
- unsigned track_depth = numeric_limits<unsigned>::max();
- for(vector<GL::SelectRecord>::iterator i=select_buf.begin(); i!=select_buf.end(); ++i)
- if(i->min_depth<track_depth)
- {
- track = reinterpret_cast<Track3D *>(i->names.back());
- track_depth = i->min_depth;
- }
-
- return track;