不知这个Pov是不是你所说的：
POV is a powerful 3d rendering engine easily capable of producing
images which rival those of packages costing in the thousands.
以下是它的官方站点： http://www.povray.org/
至于Mod3，我在YAHOO上一搜，吓了我一个跟头：
RELAP5/MOD3 is a computer code used for the thermal-hydraulic
analysis of transients and small-break type accidents in light-water
nuclear power plants by the Nuclear Regulatory Commission (NRC).
