"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
>
> Well, if it doesn't slow down renders without photons too much, it
> shouldn't slow down renders with them. It would make the collecting
> stage slower, though.
>

True - but are there any circs when an iso didn't slow down rendering? Also, and
IMHO, if the render doesn't slow to a crawl when combining isos, media and
reflectivity then you're doing something wrong....

All I was really trying to say was that, if you're just trying to influence the
paths of photons, then a normal may be all you need (I should own up that until
the other day I didn't know that normals would influence photons, and therefore
used an iso quite unnecesserily).

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