"Chris R" <car### [at] comcastnet> wrote:
> "Mr" <m******r******at_hotmail_dot_fr> wrote:
> > "Chris R" <car### [at] comcastnet> wrote:
> > > "Chris R" <car### [at] comcastnet> wrote:
> > > > "Chris R" <car### [at] comcastnet> wrote:
> > > > > I went back and did some more work generalizing the code I use to create
brick
> > > > > walls, and some new code I wrote to create concrete sidewalks.  The new code
> > > > > includes the ability to create American and English spanning layouts for
bricks,
> > > > > but still uses isosurfaces with brick pigment functions.
> > > > >
> > > > > The tufts of grass are generated using parts of the makegrass.inc macros
from
> > > > > Gilles Tran.
> > > > >
> > > > >
> > > > > -- Chris R.
> > > > This time with the image!
> > > >
> > > >
> > > > -- Chris R.
> > >
> > > I made some updates after resolving some issues noted in the "transparent box"
> > > thread.  I have another version where I tried to show tendrils of steam rising
> > > from the sidewalk, the way a wet sidewalk would look in the heat of the day, but
> > > they looked more like streaks of rain, which didn't match the fact that the sun
> > > was out in the rest of the image, so I took them out.  I left some media fog
> > > right on the sidewalk, though.
> > >
> > >
> > >
> > > -- Chris R.
> >
> > This media fog effect is really interesting ! And the flower in the middle
> > really takes on some awesome dramatic composition through its lighting.
> > (there's still an issue with lack of perceptible finish for the red bricks. and
> > it's the only issue now. I believe it would help a lot since they take up so
> > much space in the image)
>
> Thanks!  The sun in this scene was positioned to cause the triangular highlight
> on the limestone block and light the downspout.  I placed the flower to face the
> sun as well.  However, that essentially puts the sun just behind the wall, so
> the face doesn't get lit by it except by ambient light.
>
> If I could think of a logical reason for there to be another light source that
> would show off the bricks, I'd add it in.  I suppose I could try changing the
> time of day a little bit to get the sun just in front of the wall, and hope I
> don't lose the interesting highlight on the block.
>
> -- Chris R.

I expected that was the reason. very reasonable and indeed not braking the
quality of light on the main subject is hard, but would become easier with a
third lighting (sky being one with radiosity and your current sun the second). I
think Bald Eagle's suggestion can be a good possibility, there might even be
some glass windows (/ shop's display?) on that wall or cars from the street
reflecting hotter points ? In any case, if the most tolerable variation to you
(whichever you end up chosing) appears to not be enough to bring some realism to
that texture, maybe the texture is the culprit? even if itsn't I think the
finish could still be worked upon to maximize it : e.g. by having some sand
grain sized freckles acting more in normal than pigment,

injecting something like normal {wrinkles 0.75 scale 0.1} inside what you
currently have

Using rather phong (below 0.25) than specular, and diffuse with albedo keyword
such as:

diffuse albedo 0.65

....and lowering the brilliance parameter a little below 1.0 to really simulate
an Oren nayar shader of maximal sigma and roughness material as such minerals
should be. (also check that this finish ambient value is left to zero)

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