Steve wrote:
> Is there a way to print a vector using #debug?  And if so could someone
> please give an example?
> 

Try this:

// ----------
//
// Simply "returns" a vector in a string in POV-Ray notation
//
#macro v_string (V)
  concat ("<", str (V.x, 0, 4),", ", str (V.y, 0, 4),", ", str (V.z, 0, 
4),">")
#end


#declare Wanna_see_this_vector = <2, 0.1, 12.5>;

// Should print <2, 0.1, 12.5> to the debug output
#debug v_string (Wanna_see_this_vector)
// ----------

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Sebastian H. <seb### [at] webde> wrote:
> #macro v_string (V)
>   concat ("<", str (V.x, 0, 4),", ", str (V.y, 0, 4),", ", str (V.z, 0, 
> 4),">")
> #end

  Why not use vstr() instead?

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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"Steve" <ste### [at] zeroppsuklinuxnet> wrote in message
news:slr### [at] zero-ppslocaldomain...

> a working solution for either of the problems posted above, I'd be grateful
> if someone could post an example of how to center an object.
>

It's worth noting that "centering an object" rarely makes sense, since most
things don't have a centre in human terms, and nothing has a centre in POV
terms. Using the bounding box is a workaround, but, for example, the centre of
an L-shaped shape, according to its bounding box, is going to be an empty area
(half way and half way along).

I realise that this isn't really an issue when thinking about a text-string, but
conceptually you can get very stuck if you think of POV objects as having a
centre (generally because, if you decide that objects have a centre, then you
expect transformations to work with those centres).

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On Sun, 14 Apr 2002 20:56:34 -0500, Christopher James Huff wrote:
> In article <slr### [at] zero-ppslocaldomain>,
>  Steve <ste### [at] zeroppsuklinuxnet> wrote:
> 
>> Is there a way to print a vector using #debug?  And if so could someone
>> please give an example?
> 
> The #debug statement only takes strings, so you will need to convert the 
> vector to a string first. Since you seem to be using POV-Ray 3.5, look 
> up the documentation for the vstr() function.

Thanks Chris, I'm suffereing severely as there isn't a text version of the 
3.5 docs available yet (or wasn't last night).  

> 
>> This is only part of my current problem, I'm trying to center text but 
>> there is NO documentation on this, though in both the POV docs and in the
>> VFAQ this is listed as a question that is answered - but the question is 
>> not answered it just says use min and max_extent.  
> 
> The answer is to use min_extent() and max_extent(). ;-)
> Once you have the coordinates of each corner of the bounding box, it is 
> very simple to translate it so it is centered over the origin or any 
> other desired point. Just find the center and translate by -CenterPos.
> Or you could use the standard macro for this: Center_Trans() in 
> transforms.inc.

Thanks, I'll have a go at this.  Now that I can #debug vectors I'll be 
able to sort something out. 

-- 
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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On Mon, 15 Apr 2002 07:13:37 +0200, Sebastian H. wrote:
> Steve wrote:
>> Is there a way to print a vector using #debug?  And if so could someone
>> please give an example?
>> 
> 
> Try this:
> 
> // ----------
> //
> // Simply "returns" a vector in a string in POV-Ray notation
> //
> #macro v_string (V)
>   concat ("<", str (V.x, 0, 4),", ", str (V.y, 0, 4),", ", str (V.z, 0, 
> 4),">")
> #end

Thanks that syntax is what I needed. 
 
> 
> #declare Wanna_see_this_vector = <2, 0.1, 12.5>;
> 
> // Should print <2, 0.1, 12.5> to the debug output
> #debug v_string (Wanna_see_this_vector)
> // ----------
> 

Thanks again, I may incorporate soemthing liek this.  I just hope my 
3.5 hasn't expired on me. 

-- 
#local i=.1;#local I=(i/i)/i;#local l=(i+i)/i;#local ll=(I/i)/l;box{<-ll,
-((I/I)+l),-ll><ll,-l,ll>pigment{checker scale l}finish{ambient((I/l)/I)+
(l/I)}}sphere{<i-i,l-l,(I/l)>l/l pigment{rgb((I/l)/I)}finish{reflection((
I/l)/I)-(l/I)specular(I/l)/I}}light_source{<I-l,I+I,(I-l)/l>l/l} // Steve

Post a reply to this message

> 
> Thanks again, I may incorporate soemthing liek this.  I just hope my 
> 3.5 hasn't expired on me. 
> 

This is what happened to me this morning when I wanted to trace a little 
  animation while stying at university :-)))

Sebastian H.

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Warp wrote:
> Sebastian H. <seb### [at] webde> wrote:
> 
>>#macro v_string (V)
>>  concat ("<", str (V.x, 0, 4),", ", str (V.y, 0, 4),", ", str (V.z, 0, 
>>4),">")
>>#end
> 
> 
>   Why not use vstr() instead?
> 

You're right vstr() would be a better (!!?) solution but since this is a 
new user group I thought it won't hurt to give an example of how to use 
the concat () and str () which are very essencial in my thoughts (I use 
them a lot).
(Beside I wrote this little macro just yesterday for myself and had 
somwhere in mind that there exists a vstr () function which takes soooo 
many args :-).)


Sebastian H.

(Oh dear, I have to improve my english...)

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Sebastian H. <seb### [at] webde> wrote:
> (Beside I wrote this little macro just yesterday for myself and had 
> somwhere in mind that there exists a vstr () function which takes soooo 
> many args :-).)

  You can use vstr() in your macro.

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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In article <3cbb4472@news.povray.org>, Warp <war### [at] tagpovrayorg> 
wrote:

> Sebastian H. <seb### [at] webde> wrote:
> > (Beside I wrote this little macro just yesterday for myself and had 
> > somwhere in mind that there exists a vstr () function which takes soooo 
> > many args :-).)
> 
>   You can use vstr() in your macro.

And the strings.inc include file has several shortcut macros, including 
versions that take only one argument, the vector to be converted.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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> I'd be grateful if someone could post an example of how to center an
object.

Use the Center_Object() macro in "shapes.inc"
The syntax is: Center_Object(object_to_center, axis_to_center_on)
Axis can be combined, if you want to center the object at y and z axis, use
y+z .

#include "shapes.inc"
#declare Object = text{ttf "arial.ttf" "Look! I'm centered!!" 0.5,0 pigment
{rgb 1}}
Center_Object(Object,x+y+z)

This should do the trick..

--
_.-=^=-._.-=[ Peter ]=-._.-=^=-._
  _.-=[ http://hertel.no/peter ]=-._

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