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Cannot change line width with glLineWidth...

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I just tried to change the line width with glLineWidth but it doesn't work. Even with the default project files from Dev-C++, It still doesn't work. the code is as simple as like this... glClearColor (0.0f, 0.0f, 0.0f, 0.0f); glClear (GL_COLOR_BUFFER_BIT); glPushMatrix (); glBegin (GL_LINES); glLineWidth(5); glVertex2f (-0.5f, 0.0f); glVertex2f (0.5f, 0.0f); glEnd (); glPopMatrix (); PLEASE HELP ME!!!

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