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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)}
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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)}
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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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B
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B
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Thank you for your help, everybody. There seem to be a clear majority for B.
On all three variants the bottom third of the shaft is a cylinder. On A
the rest is a cone. On B the rest is an ellipsoid (or stretched sphere,
if you like). C is a combination, where the middle third is an
ellipsoid, and the top third is a cone. The diameter where the two parts
meet is halfway between the diameters in the same place on A and B.
Personally I think that C looks more like the drawings in the book than
the two other. Hmm, maybe I should give the lathe object a shot, like
Anders K suggests. After all, IIRC the Bezier spline was developed to
simulate the behaviour of flexible rulers.
/Ib
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Daniel Matthews wrote:
> 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.
I have used the measurements from Palladio's drawings, so I can't help that.
/Ib
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