Hi.

This bug is similar to those reported by Dan Connelly on
Sat, 07 Nov 1998 (Truncated prism)

The expected result is a closed prism, but one can see surfaces that
should be hidden.  This also causes problems when using prism in CGS.

--------------------------------------------------------------------

#default{pigment{rgb 1}}

camera{location <-1.1, 3, -3> look_at .5*y}

light_source{<-2,3,-3> rgb 1}

prism{
 0 1 4
 <-1,-1> <1,-1> <0,1> <-1, -1>
}

-------------------------------------------------------------------

POV-Ray version 3.1g [.MacCodeWarrior]

! --- General System Information ---
! Available Memory:  7099 KBytes
! MacOS system version: 8.10
! AppleScriptExists:    1
! QuickTimeVersion:     3.00   ImageCompressionExists:  1
! CPU type:             PowerPC

(In fact this is a Power G3 mac but the bug also appears in iMac)

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