The bricks look quite good (the textures are a bit too uniform though) 
but the mortar could be improved.  It is a bit too broad i think and 
real mortar is not completely flat but curved between the bricks (the 
bricklayers have a special tool to form this).

Christoph

-- 
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 25 Oct. 2003 _____./\/^>_*_<^\/\.______

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"Mael" <mae### [at] hotmailcom> wrote in message
news:3fcce327$1@news.povray.org...

> Nice (model & colors) but isn't it a bit strange to have some bricks
covered
> by mortar  ?

First, thanx.  :-)

Second, it's probably a bit strange.  In this case, the bricks are actually
"sinking into" the mortar as created by the macro.  It looks a little
strange up-close, though not altogether wrong, but from a distance, it looks
like the bricks are just a little bit irregular, which is exactly the effect
that I want.  For newer walls, the "roughness" factor can be adjusted, to
make the bricks much more regular (or indeed perfect rectangles).

The actual school I'm modelling was apparently built in 1873, according to
the mortar plaque* on the front of the building.

Here's a more distant view, using a small amount of focal blur (a little too
much, I think).

-- 
Jeremy
* I'm not sure that's what it's called.

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Attachments:
Download 'School2a.jpg' (64 KB)

Preview of image 'School2a.jpg'

Not so sure...  I really like your wall as well.  It looks like you've added
in some variance for shapes and sizes as well.  I'll probably end up doing
that also.

-- 
Jeremy
"Jim Charter" <jrc### [at] msncom> wrote in message
news:3fccec79$1@news.povray.org...
> Nice one.  I tried the same thing with considerably less success:
> http://www.irtc.org/ftp/pub/stills/2002-02-28/rubyslip.jpg
>

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"Christoph Hormann" <chr### [at] gmxde> wrote in message
news:r27### [at] tritonimagicode...
>
> The bricks look quite good (the textures are a bit too uniform though)
> but the mortar could be improved.  It is a bit too broad i think and
> real mortar is not completely flat but curved between the bricks (the
> bricklayers have a special tool to form this).
>

Good point, but in my current implementation, the mortar is simply a mostly
flat wall inside the brick wall, which is why you see some mortar splotched
on the most uneven surfaces.  For newer, more even bricks, I'm sure I could
add something like that into the macro.

But from my reference wall picture, it looks pretty flat.  Maybe they didn't
use those tools in this area in 1873.  hehe

I'm not entirely happy with the f_granite iso-surface pigment, either.  I
experimented with f_agate among others, and each gave semi-satisfactory
results.  Maybe I'll make that a user switchable part of the macro.

BTW, I used your isocsg IC_Box functions for the bricks. I can't imagine
dealing with iso-surfaces otherwise.  Thanx!

-- 
Jeremy

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Program ended abnormally on 02/12/2003 14:57, Due to a catastrophic
Jeremy M. Praay error:
> Here's a more distant view, using a small amount of focal blur (a little too
> much, I think).
> 

Must... control... urge... to... spray-paint... grafitti...


Serioulsy, though, I was a bit puzzled by the mortar seeping through the bricks 
in the close-up but in that wider picture, it doesn't show, so that good.  Very 
nice.  I'm looking forward to seeing the rest of the image.

-- 
/*Francois Labreque*/#local a=x+y;#local b=x+a;#local c=a+b;#macro P(F//
/*    flabreque    */L)polygon{5,F,F+z,L+z,L,F pigment{rgb 9}}#end union
/*        @        */{P(0,a)P(a,b)P(b,c)P(2*a,2*b)P(2*b,b+c)P(b+c,<2,3>)
/*   videotron.ca  */}camera{orthographic location<6,1.25,-6>look_at a }

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Great looking brick wall. Sorry about the corner normal problem with
the brick wall I posted. For my use (a distant building with corner quions)
it wasn't very noticeable, but it did bug me. I returned to the code later
and fiddled with it, but never got it perfect. The goal with the normals
was to give the bricks realistic edges, rounded but still rough and
variable (each brick unique). I learned isosurfaces later and decided
there was no point to working out the complex normals when the
actual shapes should be possible.

I plan to write a realistic brick wall macro for the final building in
my Venice image (yes, *still* in progress). I may steal some of your
ideas for that. It will be in the foreground so it'll have to be very
detailed.

I would like to give the mortar a realistic look, with different
mortar textures and joint shapes. I know a few of the techniques
bricklayers use, using a jointer tool. The two most popular joints
are the 'V' and the concave. My house, for instance, has the 'V' joint,
created with the tip of the trowel. The joint type has a big impact
on the overall look of a wall. The flat joint used for your school
seems popular with business buildings, but it doesn't shed water
as well.

There are a lot of other factors/options that could be added to a
brick wall macro, such as roughness of edges and mortar splatter,
and aging/breaking. But the nice thing about a macro is, once
written, it could create many different types of walls.

Look forward to seeing more of your work, and really appreciate you
posting work like this (and your excellent grass macro) here.

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"Renderdog" <slo### [at] hiwaaynet> wrote in message
news:web.3fce043dd5cd80e23e7f78a60@news.povray.org...
> Great looking brick wall. Sorry about the corner normal problem with
> the brick wall I posted.

No biggie.  It's always nice having a macro that a person writes himself,
and therefore understands the code perfectly, should it ever need to be
tweaked.  hehe.

> I plan to write a realistic brick wall macro for the final building in
> my Venice image (yes, *still* in progress). I may steal some of your
> ideas for that. It will be in the foreground so it'll have to be very
> detailed.

Feel free to use, borrow, modify, improve, etc.

> There are a lot of other factors/options that could be added to a
> brick wall macro, such as roughness of edges and mortar splatter,
> and aging/breaking. But the nice thing about a macro is, once
> written, it could create many different types of walls.

Right.  I'm not trying to write the brick-wall macro to end all brick wall
macros, but the idea has crossed my mind.  Right now, I just wanted
something that looks good from a small distance, and I've probably already
exceeded what I really need it for.  But then again, if I end up making
something that I want to put on a poster, I'll probably re-render at some
ultra-huge size.

> Look forward to seeing more of your work, and really appreciate you
> posting work like this (and your excellent grass macro) here.

Thanks!  I'm very grateful to everyone else who has donated their code and
macros and libraries, so whenver I come up with something that I haven't
seen before (or a new spin on something old), I try to post it here.  My
knowledge level will probably never be close to that of many others around
here - I'm barely scratching the surface of iso-surfaces (no pun intended) -
but for anyone new, or somewhere around my level, I hope to give them
something to work with.

And for anyone reading that might be afraid of trying iso-surfaces, don't
let iso-surfaces scare you.  Use Christoph's isoCSG library.  It's really
not as complex as it might seem.  Just don't forget about max_gradient.  ;-)

-- 
Jeremy

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Indeed. The width of the mortar, the surface texture, the shape etc. is
highly dependent on the geographical area, building period, purpose of the
building, visibility of the finished wall, funds available for building, and
so on.

If it looks like the example, it'ok.

Frans

"Jeremy M. Praay" <jer### [at] questsoftwarecom> schreef in bericht
news:3fccf730$1@news.povray.org...
> "Christoph Hormann" <chr### [at] gmxde> wrote in message
> news:r27### [at] tritonimagicode...
> >
> > The bricks look quite good (the textures are a bit too uniform though)
> > but the mortar could be improved.  It is a bit too broad i think and
> > real mortar is not completely flat but curved between the bricks (the
> > bricklayers have a special tool to form this).
> >
>
> Good point, but in my current implementation, the mortar is simply a
mostly
> flat wall inside the brick wall, which is why you see some mortar
splotched
> on the most uneven surfaces.  For newer, more even bricks, I'm sure I
could
> add something like that into the macro.
>
> But from my reference wall picture, it looks pretty flat.  Maybe they
didn't
> use those tools in this area in 1873.  hehe
>
> I'm not entirely happy with the f_granite iso-surface pigment, either.  I
> experimented with f_agate among others, and each gave semi-satisfactory
> results.  Maybe I'll make that a user switchable part of the macro.
>
> BTW, I used your isocsg IC_Box functions for the bricks. I can't imagine
> dealing with iso-surfaces otherwise.  Thanx!
>
> -- 
> Jeremy
>
>

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"Jeremy M. Praay" <jer### [at] questsoftwarecom> wrote:
> I'm working on building a replica of an old schoolhouse just a couple miles
> from where I live.  No reason in particular.  I'm just impressed by all
> things sufficiently old.
>
> Anyway, as part of that, I'm making a set of iso-surface brick wall macros,
> which I'll post in p.b.s-f once I've got them working reasonably well,
> probably in a few weeks.  If anyone would like something sooner, feel free
> to email me.


Was this macro ever uploaded? Using Google I can only find this thread. Thanks.


Michael

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On 27-5-2019 10:38, posfan12 wrote:
> "Jeremy M. Praay" <jer### [at] questsoftwarecom> wrote:
>> I'm working on building a replica of an old schoolhouse just a couple miles
>> from where I live.  No reason in particular.  I'm just impressed by all
>> things sufficiently old.
>>
>> Anyway, as part of that, I'm making a set of iso-surface brick wall macros,
>> which I'll post in p.b.s-f once I've got them working reasonably well,
>> probably in a few weeks.  If anyone would like something sooner, feel free
>> to email me.
> 
> 
> Was this macro ever uploaded? Using Google I can only find this thread. Thanks.
> 
> 

Probably not; I would have it in my collection. ;-)

-- 
Thomas

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