On 07/17/2015 06:18 AM, MidiPlay wrote:
> I'm using "parametric" to generate the surface of a cylinder, and it's being
> displayed with bits missing.
> ----
> #include "colors.inc"
> background { rgb 0.05 }
> light_source { <0,+10000,0> rgb 1 }
>
> parametric
> {
>      function { 10 * (       0.5 * sin(v)) }
>      function { 10 * ( 1   + 0.5 * cos(v)) }
>      function { u }
>      < -9, -pi/2 >, < 0, +pi/2 >
>      contained_by { sphere { 0, 20 } }
>      texture { pigment { rgbft < 0.5,  0,  0,  0.5, 0 > } }
>      interior_texture { pigment { rgbft < 0, 0.5, 0, 0.5, 0 > } }
> }
> camera
> {
>      orthographic
>      location < -5555, 5555, -7777 >
>      angle 0.25
>      look_at 0
> }
> ----
> If I move the camera higher to location < -5555, 15555, -7777 > then it's
> displayed correctly.  What's going on?

max_gradient 1.3 just after contained_by fixes it, however in playing 
around with it i discovered that a value smaller than 1.2-e05 (1.19e0-5) 
causes a segmentation fault when using the accuracy parameter:

Segmentation fault 196608

same place for:
ash@aries:~/POV-Ray/Source $ uberpov --version
UberPOV 1.37.1.0

ash@aries:~/POV-Ray/Source $ povray --version
POV-Ray 3.7.1-alpha.8141620.unofficial

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