Hi!
How can I assign the x (or y, z) value stored in a vector with a variable?

Thanks
Steve
http://csi.findhere.com
csi### [at] usanet

Post a reply to this message

#declare this = <1, 2, 3>

sphere {<this.x, this.y, this.z>, this.x + this.y + this.z}

gives:

sphere {<1, 2, 3>, 6}

well, you get the idea...

-Mike


> 
> Hi!
> How can I assign the x (or y, z) value stored in a vector with a variable?
> 
> Thanks
> Steve
> http://csi.findhere.com
> csi### [at] usanet

Post a reply to this message

#declare Myvector=<1,2,3>

if you want the x, you can type Myvector.x (as Mike said).
This is actually tha same as saying Myvector*<1,0,0>

Julius

Post a reply to this message

Julius Klatte wrote:
> 
> #declare Myvector=<1,2,3>
> 
> if you want the x, you can type Myvector.x (as Mike said).
> This is actually tha same as saying Myvector*<1,0,0>
> 
Isn't the first one faster, since there si no vector multiplication
involved ???

I'd think it is, perhaps do a test with some 100 000 000 tries of each..
or, just assume .x is faster :-)

//Spider

Post a reply to this message

Julius Klatte <jku### [at] hotmailcom> wrote:
: if you want the x, you can type Myvector.x (as Mike said).
: This is actually tha same as saying Myvector*<1,0,0>

  I dont think so.
  If Myvector is <2,3,4>, Myvector.x is the float value 2 while
Myvector*<1,0,0> is the vector value <2,0,0>.

-- 
main(i){char*_="BdsyFBThhHFBThhHFRz]NFTITQF|DJIFHQhhF";while(i=
*_++)for(;i>1;printf("%s",i-70?i&1?"[]":" ":(i=0,"\n")),i/=2);} /*- Warp -*/

Post a reply to this message

In article <36c3363e.0@news.povray.org> , Nieminen Mika <war### [at] cctutfi>  
wrote:

>   I dont think so.
>   If Myvector is <2,3,4>, Myvector.x is the float value 2 while
> Myvector*<1,0,0> is the vector value <2,0,0>.

Hmm, this depends on the definition of the "*", it could mean dot product or
cross product...but in POV-Ray it is simply  <v1.x * v2.x, v1.y * v2.y, v1.z
* v2.z>.


    Thorsten

Post a reply to this message