glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor3f( 0.0, 0.0, 0.0 );
+ float arrowLength = 0.5;
+
glBegin(GL_LINES);
+ // x arrow
glVertex3i( lineLength, 0.0, 0.0 );
glVertex3i( -lineLength, 0.0, 0.0 );
- glEnd();
+
+ // x arrowheads
+ glVertex3i( lineLength, 0.0, 0.0 );
+ glVertex3i( lineLength - arrowLength, 0.0, arrowLength );
- glBegin(GL_LINES);
+ // z arrow
glVertex3i( 0.0, 0.0, lineLength );
glVertex3i( 0.0, 0.0, -lineLength );
glEnd();