but i also tried others' idea for changing the max_trace_level to be 20, and
the result appears excellent, though the render speed is slow, and am going
to seek for appropriate values for the max_trace_level and min reflection.

thanks, everyone, your ideas are so helpful~~~~,

"lien0n" <nomail@nomail> wrote:
> i turned it to 0.5, and the result is much better~
>  :)
>
> "Kenneth" <kdw### [at] earthlinknet> wrote:
> > "lien0n" <nomail@nomail> wrote:
> > > i got a trianglar mesh file, and i render it with the "mesh2" object, the
> > > result can be seen in the attachment. But there so many black holes in the
> > > image.
> >
> > Just a guess, but could it have something to do with your REFLECTION values?
> > You have reflection {0.0, 1.0} as the min and max values.  The POV docs say,
> > "The minimum value is how reflective the surface will be when viewed from a
> > direction parallel to its normal..."  Here, the min value is 0...meaning
> > black (?) or no light reflection at all (?). Again, I'm just guessing, as I
> > haven't had occasion to use "minimum reflection" before, so I don't really
> > know *how* it works.
> >
> > Ken

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