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The following paraboloid renders correctly:
intersection
{ quadric { <1, 0, 1>, <0, 0, 0>, <0, 1, 0>, -1 }
cylinder { 0, y, 1 }
}
However, when I extend the clipping cylinder downward:
intersection
{ quadric { <1, 0, 1>, <0, 0, 0>, <0, 1, 0>, -1 }
cylinder { -y, y, 1 }
}
the object disappears completely in POV-Ray 3.7 and 3.7.1. In POV-Ray
3.6.1, it renders as expected.
POV-Ray 3.7.0.unofficial
POV-Ray 3.7.1-alpha.8150025.unofficial
openSUSE 13.2 GNU/Linux
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