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I am trying to model a column of the Tuscan order after the drawings in
"The First Book of Andrea Palladio's Architecture". The base and top is
easy enough, being simple geometrical shapes, but the shaft of the
column is another matter. It should not be a simple cone, but have some
swelling along the way up, to counteract some optical effect.
The method Palladio uses to get the shape, is to make the lower third of
the shaft perpendicular, and then place "the edge of a thin rule" along
that line and bend it back to the "point of diminution" at the top of
the shaft.
Since I can't find anything in the PovRay docs about using "thin rulers"
to odel things, I have tried to fake..eh..approximate the shape with
some different CSG primitives. I have come up with three variations, but
I'm having problems deciding, which one looks best, so I thought I'd ask
your opinions.
In the attached image the two colums on the left is one solution
(designated A), the tow in the middle another (B), and the two on the
right a third (C). Now just tell me which version you think looks best,
most "classical", most pleasing to the eye, or what you want to call it.
TIA
/Ib
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Attachments:
Download 'tuscan3.jpg' (47 KB)
Preview of image 'tuscan3.jpg'
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I like A the best, but it may be because of the lighting which is not
uniform from collumn to collumn.
BTW, I should have an corinthien collumn from the Books of Palladio's
somewhere, although the shaft is made of cylinders and cones. (I beleive I
was using pov 2.x at the time).
Povingly,
Philippe
Ib Rasmussen wrote:
> I am trying to model a column of the Tuscan order after the
> drawings in "The First Book of Andrea Palladio's Architecture". The
> base and top is easy enough, being simple geometrical shapes, but
> the shaft of the column is another matter. It should not be a
> simple cone, but have some swelling along the way up, to counteract
> some optical effect.
>
> The method Palladio uses to get the shape, is to make the lower
> third of the shaft perpendicular, and then place "the edge of a
> thin rule" along that line and bend it back to the "point of
> diminution" at the top of the shaft.
>
> Since I can't find anything in the PovRay docs about using "thin
> rulers" to odel things, I have tried to fake..eh..approximate the
> shape with some different CSG primitives. I have come up with three
> variations, but I'm having problems deciding, which one looks best,
> so I thought I'd ask your opinions.
>
> In the attached image the two colums on the left is one solution
> (designated A), the tow in the middle another (B), and the two on
> the right a third (C). Now just tell me which version you think
> looks best, most "classical", most pleasing to the eye, or what you
> want to call it.
>
> TIA
> /Ib
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It's difficult for me to see the difference. But I prefer the C shape,
because it looks stronger. I think A looks weaker, and B is confusing. Maybe
all 3 of them will do equally well, to hold up a building, but I just feel
most comfortable with C.
Regards,
Hugo
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Ib:
I like B best. It seems somehow sturdier.
Aaron
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Ib Rasmussen wrote:
I think B is the best, closest to what it should be, but it
still looks a teeny bit exaggerated (even though it's more
subtle then the others).
Remco
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Ib Rasmussen
> Since I can't find anything in the PovRay docs about using "thin rulers"
> to odel things, I have tried to fake..eh..approximate the shape with
> some different CSG primitives.
I'm certainly no expert on this stuff, but have you tried using a lathe?
Based on your description, I'd try something like:
union {
cylinder { <0, 0, 0>, <0, Height/3, 0>, ThickRadius }
lathe {
bezier_spline 4,
<ThickRadius, Height/3>
<ThickRadius, 2*Height/3>
<ThinRadius, Height>
<ThinRadius, Height>
}
}
Anders
--
light_source{6#local D=#macro B(E)#macro A(D)#declare E=(E-#declare
C=mod(E D);C)/D;C#end#while(E)#if(A(8)=7)#declare D=D+2.8;#else#if(
C>2)}torus{1..2clipped_by{box{-2y}}rotate<1 0C>*90translate<D+1A(2)
*2+1#else}cylinder{0(C-v=1).2translate<D+C*A(2)A(4)#end-2 13>finish
{specular 1}pigment{rgb x}#end#end#end-8;1B(445000298)B(519053970)B
(483402386)B(1445571258)B(77778740)B(541684549)B(42677491)B(70)}
Post a reply to this message
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"Anders K." <and### [at] kaseorg com> wrote in news:3e11ceda$1@news.povray.org
> bezier_spline 4,
You will need 2 more control points before and after this shape AFAIR
--
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M
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On Tue, 31 Dec 2002 12:28:50 +0100, Ib Rasmussen wrote:
>
> In the attached image the two colums on the left is one solution
> (designated A), the tow in the middle another (B), and the two on the
> right a third (C). Now just tell me which version you think looks best,
> most "classical", most pleasing to the eye, or what you want to call it.
>
B
--
sphere{z*5,1pigment{rgb.5}finish{reflection.3specular.5}}box{<-50,-3,-50>
<50,-2,50>pigment{checker/*\__\\__/ * \_\\__*/scale 2}finish{ambient.7}}
light_source/*__\\__\\__\\__\\__\( ~ )\__\\__\\__\\__\\*/{<2,5,1>*4,1}
/*\\__\\__\\__\\__\\__\\__\\__\\__\~ -/__\\__\\__\\__\\__\\*//* Steve */
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I wrote:
> > bezier_spline 4,
Rafal 'Raf256' Maj wrote:
> You will need 2 more control points before and after this shape AFAIR
I have those. The visible part of the spline is between points #2 and #3. (I
did test my code, and it looks about right to me.)
Anders
--
light_source{6#local D=#macro B(E)#macro A(D)#declare E=(E-#declare
C=mod(E D);C)/D;C#end#while(E)#if(A(8)=7)#declare D=D+2.8;#else#if(
C>2)}torus{1..2clipped_by{box{-2y}}rotate<1 0C>*90translate<D+1A(2)
*2+1#else}cylinder{0(C-v=1).2translate<D+C*A(2)A(4)#end-2 13>finish
{specular 1}pigment{rgb x}#end#end#end-8;1B(445000298)B(519053970)B
(483402386)B(1445571258)B(77778740)B(541684549)B(42677491)B(70)}
Post a reply to this message
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Ib Rasmussen wrote:
> I am trying to model a column of the Tuscan order after the drawings in
> "The First Book of Andrea Palladio's Architecture".
I think the attached image is from a Paladio Original.
N.B. there is some variation between free standing and the columns set
against walls etc. Your's look a little on the slim side.
Post a reply to this message
Attachments:
Download 'tuscan_1.jpg' (26 KB)
Preview of image 'tuscan_1.jpg'
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