clipka <ano### [at] anonymousorg> wrote:
> Am 24.05.2014 23:39, schrieb Eriban:
> > I have bumped into a bug while using the cylindrical bump map feature. For
> > inward-facing surfaces the bumps are incorrect.
>
> I guess this is another symptom of a long-standing bug (probably dating
> back to when normal perturbations were first introduced), which has been
> mentioned at least as early as 2008:
>
http://news.povray.org/povray.general/thread/%3Cweb.493114d0114da4434dea3830%40news.povray.org%3E/?mtop=291496

Thanks for confirming  this is a bug, and one that has not been fixed yet.

> In short: Whether your POV-Ray bump maps will be inward, outward, or
> even kind of "sideways" (some weird effect where the light seems to be
> coming from a direction perpendicular to where it really is), is kind of
> a matter of chance, and may be different for different sides of any
> given object.

That's indeed what seems to be happening.

> I do have plans to get rid of the problem some day, but I suggest to not
> hold your breath.

Okay, I was planning to use this for engraving a text. I might still do that,
because the alternative of using CSG gives hard edges, which I don't expect will
look as good (I have not yet tried it). Anyway, with a bit of luck it will not
be that obvious. I was zooming in to get a few details right when I noticed.

Cheers,
Erwin

Post a reply to this message