glColor3f (1.0, 1.0, 1.0);. glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);. glBegin(GL_POLYGON);. glVertex3f (0.25, 0.25, 0.0);. glVertex3f (0.75, 0.25, 0.0);.
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