|
 |
Lee Brown <lee### [at] prodigy net> wrote...
> Two questions:
>
> 1. In the MegaPov documentation regarding variable reflection, it states:
>
> -- start quote --
> You can make reflection_min less than reflection_max if you want, although
> the result is something that doesn't occur in nature.
> -- end quote --
This appears to be a mistake in the documentation.
> 2. Regarding IOR.
>
> Say I am modelling glass, then I would use an IOR of 1.5 which produces
the
> angular change as light passes into and out of it.
> If I want to use blinn highlights, then the example uses an IOR of 20
which
> is exceedingly large. Is this just for the example, or do the blinn
> highlights require such a high IOR in reality?
When use blinn to realistically model highlights on objects that have an
IOR, continue to use the existing IOR and modify the other parameters of
blinn (brightness and microfacet angle). The IOR used in the blinn model
comes from the IOR of the surface--it's not just a value that is intended to
be fudged. The reason that it is so high for metals is that using values
like that produces relatively realistic results for those surfaces.
-Nathan
Post a reply to this message
|
|
