Hello,


With this :

#declare Datas = array mixed;

#declare Datas[0] = <1,2,3>;
#declare Datas[1] = <1,2,3,4>;
#declare Datas[2] = <1,2>;


how can you tell that the vector in Datas[0] has 3 components and the 
vector in Datas[1] 4 ?


So far, I haven't found anything online about this. So a little help 
would be appreciated ;)



-- 
kurtz le pirate
compagnie de la banquise

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hi,

kurtz le pirate <kur### [at] freefr> wrote:
> With this :
> #declare Datas = array mixed;
> #declare Datas[0] = <1,2,3>;
> #declare Datas[1] = <1,2,3,4>;
> #declare Datas[2] = <1,2>;
>
> how can you tell that the vector in Datas[0] has 3 components and the
> vector in Datas[1] 4 ?

in a word, you/we cannot.


> So far, I haven't found anything online about this. So a little help
> would be appreciated ;)

iirc, both Bald Eagle and WFP have partial solutions.  (no refs, sorry)

if only 2/3/4 vector data is stored, you could combine vector and #components in
a 5-vector ?


regards, jr.

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On 2026-07-03 12:11 (-4), kurtz le pirate wrote:
> 
> #declare Datas = array mixed;
> 
> #declare Datas[0] = <1,2,3>;
> #declare Datas[1] = <1,2,3,4>;
> #declare Datas[2] = <1,2>;
> 
> 
> how can you tell that the vector in Datas[0] has 3 components and the
> vector in Datas[1] 4 ?

I managed to figure something out for some special applications in two
of my libraries.  Have a look at macro Caption__Get_padding() in
caption.inc and macro Lamp_Has4D() in desklamp.inc and see if you can
generalize them.

  https://github.com/CousinRicky/POV-Caption/blob/main/caption.inc
  https://github.com/CousinRicky/POV-DeskLamp/blob/main/desklamp.inc

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"jr" <cre### [at] gmailcom> wrote:

> iirc, both Bald Eagle and WFP have partial solutions.  (no refs, sorry)

I have a full solution.

https://news.povray.org/povray.general/message/%3Cweb.682bc388985098ff1f9dae3025979125%40news.povray.org%3E/#%3Cweb.682
bc388985098ff1f9dae3025979125%40news.povray.org%3E

There's a slightly more advanced version posted sometime last year, but this
should do ya.

- BE

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"Bald Eagle" <cre### [at] netscapenet> wrote:

> There's a slightly more advanced version posted sometime last year,

https://news.povray.org/povray.advanced-users/message/%3Cweb.68478f382f29ff11f9dae3025979125%40news.povray.org%3E/#%3Cw
eb.68478f382f29ff11f9dae3025979125%40news.povray.org%3E

- BE

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Thanks for your replies, guys.
Those are some really clever solutions. Bravo.

I'm not sure yet if I'll use them or rewrite my code so I don't have to 
run those tests anymore.

Thanks again




-- 
kurtz le pirate
compagnie de la banquise

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On 7/3/26 16:08, jr wrote:
> iirc, both Bald Eagle and WFP have partial solutions.  (no refs, sorry)

FWIW, sample yuqk code using its id_type() keyword.

//---
#version unofficial 3.8; // yuqk
#if (file_exists("version.inc"))
     #include "version.inc"
#end
#if (!defined(Fork_yuqk))
     #error "This POV-Ray SDL code requires the yuqk fork."
#end

#include "setidtypes.inc"       // init global.dictIdTypes dictionary
McrPrintGlobalDictIdTypes(true) // Utility macro to print types

#declare Datas = array mixed;

#declare Datas[0] = <1,2,3>;
#declare Datas[1] = <1,2,3,4>;
#declare Datas[2] = <1,2>;

#if (id_type(Datas[2])=global.dictIdTypes.v2d)
     #debug "\nDatas[2] is a 2D vector\n"
#end
#if (id_type(Datas[0])=global.dictIdTypes.v3d)
     #debug "\nDatas[0] is a 3D vector\n"
#end
#if (id_type(Datas[1])=global.dictIdTypes.v4d)
     #debug "\nDatas[1] is a 4D vector\n"
#end
#debug "\n"

#error "No objects. Testing SDL."
//---

Bill P.

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William F Pokorny <ano### [at] anonymousorg> wrote:

Well hello there, stranger.
Hope all is going as well as can be.

We've missed you in these parts.

- BW

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