MichaelJF <fri### [at] t-onlinede> wrote:
> Am 07.10.2024 um 18:22 schrieb Bald Eagle:
> > "Harry Peverell" <har### [at] 163com> wrote:
> >
> >> Does anyone know what might be causing this discrepancy? Any help would be much
> >> appreciated!
> >>
> >> Harry
> >
> > As jr pointed out, it may be a result of surface normal "flipping".
> >
> > I would assign your texture to be something dark, and then add an
> > interior_texture with a bright color and finish {emission 1}, then render a
> > straight-down view in orthographic to see if you have any flipped triangles.
> >
> > You also have some dark areas near the center of the render, which is why I'm
> > suggesting this specific approach.
> >
> > - BW
> >
> This should actually help to recognize flipped normals. I probably
> wouldn't have had this brilliant idea...
>
> But unfortunately, the diagnosis does not yet cure the disease and, as
> far as I know, POV does not offer an option for this. With Blender,
> however, you can display normals and there are several tools to invert them.
>
> Since you are working with Blender anyway, you should repair the mesh
> there and then export it to POV.
>
> Best regards
> Michael
Dear Michael

Thank you for your suggestion. I appreciate the thought you've put into this.
Initially, I was using a .ply file exported from Blender and then converted it
to a .pov file using AccuTrans. I wasn't certain if the normals were included in
that process. However, when I converted the mesh to an .obj file using MeshLab
and then back to a .pov file with AccuTrans, the errors in the Povray rendering
mysteriously disappeared. I will now proceed to test the mesh according to your
method to identify the cause of the issue.

As for applying textures in Povray, especially since I've removed all textures
from the original mesh in AccuTrans, I will need to revisit Blender to repair
the mesh there and then export it to POV, as you suggested .

Harry

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