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Tom Melly wrote:
> >I have no trouble picturing the axes in my head.
> Sounds painful, have you been arguing with Bill?
...
Er, that would be plural axis, not plural axe. ;)
--
Tim Cook
http://empyrean.scifi-fantasy.com
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GFA dpu- s: a?-- C++(++++) U P? L E--- W++(+++)>$
N++ o? K- w(+) O? M-(--) V? PS+(+++) PE(--) Y(--)
PGP-(--) t* 5++>+++++ X+ R* tv+ b++(+++) DI
D++(---) G(++) e*>++ h+ !r--- !y--
------END GEEK CODE BLOCK------
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Bill DeWitt wrote:
> It's a learning tool... there was a time when you needed
> to learn it too, whether you remember it or not.
The way I learned the axes was by drawing stuff on graph
paper (cheesy game maps mostly), I understood that as XY.
Z was then obviously the elevation.
--
Tim Cook
http://empyrean.scifi-fantasy.com
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GFA dpu- s: a?-- C++(++++) U P? L E--- W++(+++)>$
N++ o? K- w(+) O? M-(--) V? PS+(+++) PE(--) Y(--)
PGP-(--) t* 5++>+++++ X+ R* tv+ b++(+++) DI
D++(---) G(++) e*>++ h+ !r--- !y--
------END GEEK CODE BLOCK------
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Ron Parker wrote:
> Math uses the right-hand rule too. POV uses the left-hand rule by
> default because that's how it was created. Call it a historical
> accident. To change it now would just be wrong.
Hmmm... I don't think on it as an accident. Tim has really given the
answer with the question: CAD programs were done for designers, people
that thinks on floorplans with implicit x-y axis. But which was the
public POV-Ray was created for? IMHO, this is the key...
--
Jaime Vives Piqueres
La Persistencia de la Ignorancia
http://www.ignorancia.org/
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"bob h" <omn### [at] charter net> wrote in message
news:3c0ceef3@news.povray.org...
<snip>
What I've never really understood is why Moray works with right-handedness. It's
not a major problem, but it does seem odd...
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"Jaime Vives Piqueres" <jai### [at] ignoranciaorg> wrote in message
news:3C0### [at] ignoranciaorg...
> Ron Parker wrote:
>
> > Math uses the right-hand rule too. POV uses the left-hand rule by
> > default because that's how it was created. Call it a historical
> > accident. To change it now would just be wrong.
>
> Hmmm... I don't think on it as an accident. Tim has really given the
> answer with the question: CAD programs were done for designers, people
> that thinks on floorplans with implicit x-y axis. But which was the
> public POV-Ray was created for? IMHO, this is the key...
Hopefully I cancelled my reply to Ron's message before too many people saw
it.
8-o
Don't know what I was thinking, saying that image_map projected onto the xy
plane. It of course projects onto the xz plane by default. Thought POV-Ray
had some logic there before I realized my mistake.
There is still the gaming industry which uses the z axis as in/out, away
near, z-buffer and all that. That's how I learned it during using Basic to
draw things in 2D or 3D. x and y were always the plots on the screen
surface, z being depth.
--
text{ttf"arial","bob h",.1,0pigment{rgb 9}translate<-1,-.2,3>}
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Tom Melly <tom### [at] tomandlucouk> wrote:
: What I've never really understood is why Moray works with right-handedness. It's
: not a major problem, but it does seem odd...
That's not odd at all. What is odd is the strange principle that support for
left-handedness will never be added.
--
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}// - Warp -
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"Tom Melly" <tom### [at] tomandlucouk> wrote in message
news:3c0cef40$1@news.povray.org...
> "bob h" <omn### [at] charternet> wrote in message
> news:3c0ceef3@news.povray.org...
>
> <snip>
>
> What I've never really understood is why Moray works with
right-handedness. It's
> not a major problem, but it does seem odd...
Um, sorry Tom, I tried to Cancel that message because I thought I goofed on
image_map going onto xy plane. Now I have checked on it in the Docs to be
sure. :-) So now maybe I'm unconfused again. It does say xy plane. This
talk of coordinate orientation always turns me through an infinite loop!
Yeah, about Moray, it must be that the intent is to follow the logic in CAD
programs and the like.
Check out the *left-handed* Cartesian system I found:
http://www.xmlcreate.com/NCGuide/Basics101/basics101.html
--
text{ttf"arial","bob h",.1,0pigment{rgb 9}translate<-1,-.2,3>}
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"bob h" <omn### [at] charternet> wrote in message
news:3c0cf1c5@news.povray.org...
> "Jaime Vives Piqueres" <jai### [at] ignoranciaorg> wrote in message
> news:3C0### [at] ignoranciaorg...
>
> Hopefully I cancelled my reply to Ron's message before too many people saw
> it.
> Don't know what I was thinking, saying that image_map projected onto the
xy
> plane. It of course projects onto the xz plane by default. Thought
POV-Ray
> had some logic there before I realized my mistake.
What mistake, Bob?! Ha ha ha
I give up, can't win :-( I was right in the first place. Through
stumbling over this topic.
Bye now :-)
--
text{ttf"arial","bob h",.1,0pigment{rgb 9}translate<-1,-.2,3>}
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"Warp" <war### [at] tagpovrayorg> wrote in message news:3c0cf281@news.povray.org...
> That's not odd at all. What is odd is the strange principle that support for
> left-handedness will never be added.
>
Well, it is if it's principle intent is to be a POV modeller - or have i
missed/misunderstood something?
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bob h <omn### [at] charternet> wrote:
: Check out the *left-handed* Cartesian system I found:
: http://www.xmlcreate.com/NCGuide/Basics101/basics101.html
Funny, it describes the *right-handed* system using the *left-hand-metaphor*.
--
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}// - Warp -
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