private void drawDownwardLines(ChordalAxis axis)
	{
		GL11.glLineWidth(1.0f);
		GL11.glColor3f(.6f, .6f, .6f);
		for (ChordalAxisPoint point : axis.getPoints())
		{
			for (TriangulationPoint outlinePoint: point.getOutlinePoints())
			{
				GL11.glBegin(GL11.GL_LINE_STRIP);
				GL11.glVertex3d(point.getX(), point.getY(), point.getZ());
				GL11.glVertex3d(outlinePoint.getX(), outlinePoint.getY(), 0.0);
				GL11.glEnd();
			}
		}
	}