"Bald Eagle" <cre### [at] netscapenet> wrote:
> "Kenneth" <kdw### [at] gmailcom> wrote:

> >
> > The mis-match seam comes from my attempt to give my own image_map the same
> > 'tilt' of the pattern as Lanahum's...although I didn't get it quite right.
> > Then the pattern repeats on the sphere, causing the visible 'seam'.
>
> Ok, well - it doesn't seem to be there in column B.

Column B is just a copy of Lanahum's initial post, along with my gamma 2.2
'correction' for the bump_map. His own posted pattern is 'tilted' just enough to
show no seam when it repeats.
>
> Just curious if you can use spherical bump-mapping or spherical warp

I never got around to that. "So little time, so much other neat stuff to work
on." ;-)
>
> > That small circle on [the] sphere renders...
>
> That doesn't really make any sense to me.
> I'd experiment with other bump maps - maybe a grid, and see what happens, and
> where on the bump map that artefact appears.
>

You're right, it *is* kind of odd. I took a look at Lanahum's code again, and
there is nothing there to cause that little circle.

Herewith, a grid example. Same Lanahum code, but I substituted an image_map
PIGMENT using the same map_type 0; no bump_map. My grid image_map has a
2-pixel-wide vertical purple stripe on the right edge from top to bottom, as a
tester. A purple circle shows up on the sphere where the bump_map's 'circle'
was-- along with a white dot in the center, which is probably a 1-pixel 'repeat'
from the left side of the image_map(?). So the anomaly does not seem to be
bump_map specific.

Perhaps it's a result (or a glitch?) of using map_type 0 when applying an
image_map of any kind to a *sphere*.

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