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calling a subwindow from main window

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hi I have a main window and a sub window. in response to a mouse event in the main window I want to call glutpostredisplay for the sub window? is it doable and how? best wishes

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I think you are looking for glutSetWindow().
Call it before glutPostRedisplay() for each window (main or sub).
For example,
// update both main and sub window
glutSetWindow(mainWin);
glutPostRedisplay();
glutSetWindow(subWin);
glutPostRedisplay();

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