Hi,
I'm attempting to make a chain of objects (about 300 of them) in which each
object is .04 units larger than the preceding one. Each object needs to be
translated *in proportion* to its increase in size. For example, the first
object is scale 1, the second is scale 1.04, trans .01*X. My calculator
tells me that the translation =scale*0.0096154*object's number in the chain
(the first one being 0, the second one being 1, etc). So, the third object
is scale 1.08*0.0096154*2=trans 0.0207692; the fourth would be
scale 1.12*0.0096154*3=trans 0.0323076, and so on. I could calculate each
translation and go crazy in the process, or find an easier way to do it. Do
any of you have any suggestions?
Thank you,
Steve Shelby

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On Fri, 11 Jul 2003 09:54:04 -0500, "Steve Shelby" <ssh### [at] rexnetnet> wrote:
>object is scale 1, the second is scale 1.04, trans .01*X.

#local ObjectOrg = object{ ... }
#local Object = ObjectOrg;
#local Counter = 0;
#while (Counter<Iterations)
  #local Object = union{
    object{ ObjectOrg }
    object{ Object scale 1.04 translate .01*X}
  }
  #local Counter = Counter + 1;
#end

> any of you have any suggestions?

helped ?

ABX

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ABX,
I tried the code you sent, and povray rendered just the background. I guess
I didn't fill in the blanks correctly. I put a simple sphere for the object,
and replaced "Iterations" with "300". I kept everything else the same. What
am I doing wrong?
Steve

"ABX" <abx### [at] abxartpl> wrote in message
news:7vjtgvsv7pm5rvhp1i8shlv934k7a6q3gd@4ax.com...
> On Fri, 11 Jul 2003 09:54:04 -0500, "Steve Shelby" <ssh### [at] rexnetnet>
wrote:
> >object is scale 1, the second is scale 1.04, trans .01*X.
>
> #local ObjectOrg = object{ ... }
> #local Object = ObjectOrg;
> #local Counter = 0;
> #while (Counter<Iterations)
>   #local Object = union{
>     object{ ObjectOrg }
>     object{ Object scale 1.04 translate .01*X}
>   }
>   #local Counter = Counter + 1;
> #end
>
> > any of you have any suggestions?
>
> helped ?
>
> ABX

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On Fri, 11 Jul 2003 13:27:27 -0500, "Steve Shelby" <ssh### [at] rexnetnet> wrote:
> ABX,
> I tried the code you sent, and povray rendered just the background.

If you rendered that code without _any_ change than you definietly rendered
differenc code. Perhaps some ini setting refered to another input file. If you
want to render my code you _need_ changes because it was only algorithjm
presented in form of POV script. You need to:
1. declare ObjectOrg and apply some texturing to it.
2. declare Iterations
3. add some light_source
4. add camera oriented to direction where your objects are grouped

ABX

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3f0f019e@news.povray.org...
> ABX,
> I tried the code you sent, and povray rendered just the background. I
guess
> I didn't fill in the blanks correctly. I put a simple sphere for the
object,
> and replaced "Iterations" with "300". I kept everything else the same.
What
> am I doing wrong?

Hmm, did you actually display the object by adding object{Object} after the
loop? ABX's code declares it but does not display it.
This little problem happens to me regularly...

G.


--
**********************
http://www.oyonale.com
**********************
- Graphic experiments
- POV-Ray and Poser computer images
- Posters

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I'm sorry, but I can't make any sense of this at all. My level of expertise
with povray is very low, having relied  mostly on Moray to do the script
writing for me. Here's my sample pov file:

light_source {
  0*x
  color rgb <1,1,1>
  translate <-20, 40, -20>
}
camera {
  location  <0.0, 2.0, -5.0>
  look_at   <0.0, 0.0,  0.0>
  right     x*image_width/image_height
}

#declare ObjectOrg = object{
sphere {
  <0, 0, 0>
  0.01 color rgb<1,1,1>
}

 }

#declare iterations=300;
#local Object = ObjectOrg;
#declare Count = 1;
#while (Count<iterations)
  #local Object = union{
    object{ ObjectOrg }
    object{ Object scale 1.04 translate .01*Count}
  }
  #local Count = Count + 1;
#end

Could you please tell me why it renders just blackness?
Steve

"Gilles Tran" <git### [at] wanadoofr> wrote in message
news:3f0f1f52@news.povray.org...

> 3f0f019e@news.povray.org...
> > ABX,
> > I tried the code you sent, and povray rendered just the background. I
> guess
> > I didn't fill in the blanks correctly. I put a simple sphere for the
> object,
> > and replaced "Iterations" with "300". I kept everything else the same.
> What
> > am I doing wrong?
>
> Hmm, did you actually display the object by adding object{Object} after
the
> loop? ABX's code declares it but does not display it.
> This little problem happens to me regularly...
>
> G.
>
>
> --
> **********************
> http://www.oyonale.com
> **********************
> - Graphic experiments
> - POV-Ray and Poser computer images
> - Posters
>
>

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On Sat, 12 Jul 2003 17:15:33 -0500, "Steve Shelby" <ssh### [at] rexnetnet> wrote:

>I'm sorry, but I can't make any sense of this at all. My level of expertise
>with povray is very low, having relied  mostly on Moray to do the script
>writing for me. Here's my sample pov file:
>
I'm in the same boat Steve.
For a start try
#declare ObjectOrg = 
sphere {
  <0, 0, 0>
  0.1 
    texture {
      pigment { color rgb<1,1,1>  }
    }
}
This will give you your sphere (I changed the scale so I could see it)
I often use the statement (taken from Moray)

default {
  texture {
    pigment { rgb <1,0,0> }
  }
}

so that If I see a red object I know the texture statement is wrong.

Regards
        Stephen

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On Sat, 12 Jul 2003 17:15:33 -0500, "Steve Shelby" <ssh### [at] rexnetnet> wrote:
> I'm sorry, but I can't make any sense of this at all. My level of expertise
> with povray is very low, having relied  mostly on Moray to do the script
> writing for me. Here's my sample pov file:

You probably expect something like such complete scene, commented with possible
problems. Think about sense of questions in comments:

#include "transforms.inc"
light_source {
  0*x
  color rgb <1,1,1>
  translate <-20, 40, -20>
}

#declare ObjectOrg = sphere {
  <0, 0, 0>
  0.01
  pigment{ color rgb<1,1,1> }  // why not added pigment in your version ?
}

#declare Iterations=300;
#local Object = ObjectOrg;
#declare Count = 1;
#while (Count<Iterations)
  #local Object = union{
    object{ ObjectOrg }
    object{ Object scale 1.04 translate .01*x} // why X replaced with counter ?
  }
  #local Count = Count + 1;
#end

object{ Object }  // why you not added object to scene ?

camera {
  location  <0.0, 2.0, -5.0>
  #local Mn = min_extent(Object);
  #local Mx = max_extent(Object);
  look_at   (Mn+Mx)/2 // why not look to center of object ?
  right     x*image_width/image_height
}

ABX

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