   Object selection and Multiple Viewports
  Hy there. Im doing an application with 6 orho2d vieports and 1 perspective vieporti want to do my selection in the perspective vieportbefore i put the multiple vieports everything went ok - my object were selected. application working fine.Now it doesnt select my object. What can i do to select my object in the perspective vieport?Here is my Object Selection function:int RetrieveObjectID(int x, int y){int objectsFound = 0;   intviewportCoords[4] = {0};unsigned int selectBuffer[32] = {0};glSelectBuffer(32, selectBuffer);glGetIntegerv(GL_VIEWPORT, viewportCoords);glMatrixMode(GL_PROJECTION);glPushMatrix();glRenderMode(GL_SELECT);glLoadIdentity();gluPickMatrix(x, viewportCoords[3] - y, 2, 2, viewportCoords);gluPerspective(45.0f,(float)g_rRect.right/(float)g_rRect.bottom,0.1f,150.0f);glMatrixMode(GL_MODELVIEW);   DrawGLScene();objectsFound = glRenderMode(GL_RENDER);glMatrixMode(GL_PROJECTION);glPopMatrix();glMatrixMode(GL_MODELVIEW);if (objectsFound > 0){unsigned int lowestDepth = selectBuffer[1];int selectedObject = selectBuffer[3];for(int i = 1; i < objectsFound; i++){if(selectBuffer[(i * 4) + 1] < lowestDepth){lowestDepth = selectBuffer[(i * 4) + 1];selectedObject = selectBuffer[(i * 4) + 3];}}return selectedObject;}return 0;}Thanks!   
  What coordinate system are the mouse coordinates in? If they're not expressed in relation to the viewport in which you wish to select your objects, the pick matrix may not be being constructed correctly.   ;  Hmmm - you got me there.I dont knowI have the function that i call my objectIDandint WndProc i haveint objectID = 0;case WM_LBUTTONDOWN:{objectID = RetrieveObjectID(LOWORD(lParam), HIWORD(lParam));switch(objectID){case RotateID_O:{if(!RotationInCourse){Rotate_O = true; RotationInCourse = true; m_angle = 0;}}break;..............................................................................................Thats it.Have i answer to your question?