Yep I've had this before it is due, I believe to ior (internal
refraction?)and there is no solution.

Mick

SamuelT. <STB### [at] aolcom> wrote in message
news:384896EB.A252036E@aol.com...
> Has anyone else noticed this? You make a transparent object with
> reflection and ior, and somehow it seems to refract black areas of
> color. There are no such black spaces in my scene as far as I can tell.
> Anyone know what's up with this?
>
> --
> Samuel Benge
>
> E-Mail: STB### [at] aolcom
>
> Visit the still unfinished isosurface tutorial:
> http://members.aol.com/stbenge
>
>


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> > Ken wrote:
> > > max_trace_level ?

Remco de Korte wrote:
> Couldn't it be that this won't help because internal reflection
> goes on infinitely (until POV-Ray decides it's enough and decides
> the pixel should be black)?

It would take quite a perverse shape to produce infinite internal
reflexion; sooner or later you're likely to hit a surface at near enough
to the normal to escape.

I usually set maxtrace to some arbitrary number like 256, but make sure
all transmit/reflection values are <1.  If for example these are 3/4, we
reach the epsilon limit in 20 steps.

-- 
"How'd ya like to climb this high without no mountain?" --Porky Pine
Anton Sherwood  *\\* +1 415 267 0685 *\\* http://www.jps.net/antons/

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> > Probably from total internal reflection.

David Fontaine wrote:
> I thought POV didn't do that...

Well, that would account for black areas.

By the way, I got some interesting effects with ior <1, not to mention <0!

-- 
"How'd ya like to climb this high without no mountain?" --Porky Pine
Anton Sherwood  *\\* +1 415 267 0685 *\\* http://www.jps.net/antons/

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