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hi,
when i try to render a certain triangle mesh i always get very strange
artifacts, like on the pictures at
www.geometrie.tuwien.ac.at/grohs/povray/mould1.bmp
and
www.geometrie.tuwien.ac.at/grohs/povray/mould2.bmp
this only happens with a certain kind of triangle mesh (discrete moulding
surfaces exported from matlab), but there seem to be no multiple points in
the mesh and the normal vectors seem to be correct.
I really have no idea what the problem is, maybe the numerical accuracy that
povray is handling the data with is not high enough, but i think it's
something else.
thanks for your help,
philipp
btw.: if you want to take a look at the include file, it's on
www.geometrie.tuwiena.ac.at/povray/surface.inc
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sorry, i meant:
the include file is at
www.geometrie.tuwien.ac.at/grohs/povray/surface.inc
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It looks a lot like the artifacts you get when the normals on one vertex of
a triangle are pointing the opposite way the normals on the other vertices
are. (They're perpendicular to the surface, but some point out and some
point in.)
- Slime
[ http://www.slimeland.com/ ]
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"Slime" <fak### [at] email address> wrote:
thanks for your reply,
> It looks a lot like the artifacts you get when the normals on one vertex of
> a triangle are pointing the opposite way the normals on the other vertices
> are. (They're perpendicular to the surface, but some point out and some
> point in.)
>
is there any way of getting rid of the artifacts without changing the
normals?
i remember reading something about this where it said that if you use
double_illuminate it doesn't matter if the normals point inward or
outwards.
how exactly would i do this (i'm pretty new to rendering and to povray, so
please excuse my dumb questions)?
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nevermind, i've just changed the procedure that computes the surface
normals, now it works perfectly!
thanks for your quick reply!
philipp
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Hi,
the mesh seems to be ok, when loaded in Poseray 3.8.18.
But when I try to subdivide the triangles, suddenly strange normals appear,
which aren't spreaded homogenously on the surface.
Don't know where the problem is, but I wouldn't think of Povray accuracy as
part of it.
Happy rendering
Norbert Kern
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"Norbert Kern" <nor### [at] t-onlinede> wrote:
> Hi,
>
> the mesh seems to be ok, when loaded in Poseray 3.8.18.
> But when I try to subdivide the triangles, suddenly strange normals appear,
> which aren't spreaded homogenously on the surface.
> Don't know where the problem is, but I wouldn't think of Povray accuracy as
> part of it.
>
> Happy rendering
> Norbert Kern
no it has nothing to do with povray, it was the topology of the mesh. some
faces weren't orientated correctly.
thanks for your help,
philipp
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