I'm using POVRay 3.6 at WinXP Pro, and found that the following
scene reports 4 *infinite* objects:

sphere {0, 1358}
sphere {5000, 1358}
box {-1358, 1358}
box {0, 2*1358}

But the following scene reports (as expected) 4 finite objects:

sphere {0, 1357}
sphere {5000, 1357}
box {-1357, 1357}
box {0, 2*1357}

It seems that the condition for an object to be infinite is related to its
bounding box, and that there is some constant (around 2*1357) which acts as
a threshold.
Would this be a bug?

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