1. 2002-12-19 Re: [Render] Point sampling trapezoid alpha Keith Packard 2. 2002-12-19 Re: [Render] Point sampling trapezoid alpha Keith Packard 3. 2002-12-19 Re: [Render] Point sampling trapezoid alpha Vadim Plessky 4. 2002-12-19 [Render] Point sampling trapezoid alpha (was Carl Worth