On Tue, 26 Feb 2002 13:04:20 -0000, "Tom Melly" <tom### [at] tomandlucouk> wrote:
> IMHO POV thinks the objects are not visible, so doesn't render them. With the UV
> flag, POV renders all objects whether visible or not, correcting the bug.

Note UV flag turns vista buffer, right ? Documentation says it is "(...)
projecting the bounding box hierarchy onto the screen and determining the
rectangular areas that are covered by each of the elements in the hierarchy."
And it is correct with my case. Projection (screen) is parallel to xy and
cross point <0,0,1>. my object has z coordinates lower than 1 so vista buffer
exclude them. IIRC vista buffer is off by default when there is less than
three objects. So when I use two or one sphere sweep then only raw
intersection is checked. But then what Warp said? "(...) with orthographic
camera the rays don't start from the camera location but from the projection
plane". Then my sphere_sweeps shouldn't appear in any case.

ABX

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