POV-Ray : Newsgroups : povray.general : While we are talking about changes Server Time
10 Aug 2024 11:21:44 EDT (-0400)
  While we are talking about changes (Message 31 to 40 of 46)  
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From: Ken
Subject: Re: While we are talking about changes
Date: 14 Mar 2000 21:04:46
Message: <38CEF035.DA6CE8F6@pacbell.net>
cre### [at] belialrenonvus wrote:

> so y* = 1 ? (or x* = 1?) or is it y (multiplied by) ?

sphere{< 1,0, 0>, 1} = sphere{x, 1}

sphere{<-1,0, 0>, 1} = sphere{-x, 1}

sphere{< 1,1, 0>, 1} = sphere{x+y, 1}

sphere{<-1,1,-1>, 1} = sphere{-x+y+-z, 1}

-- 
Ken Tyler -  1300+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/


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From: Alan Kong
Subject: Re: While we are talking about changes
Date: 14 Mar 2000 21:31:10
Message: <2bttcs8adcdpkhiu5ev192sth898isjab4@4ax.com>
On Tue, 14 Mar 2000 09:03:27 -0500 "Bill DeWitt"
<the### [at] earthlinknet> wrote:

>    I have almost convinced my family and friends that waving your hands in
>the air, staring into space and  even pounding one hand against your temple
>while apparently grasping at and manipulating something invisible with your
>eyes tightly shut is the way we communicate with the POVray Program Goddess.
>

  You are correct, Bill, but one can also go blind using that method
<g>.

-- 
Alan - ako### [at] povrayorg - a k o n g <at> p o v r a y <dot> o r g
http://www.povray.org - Home of the Persistence of Vision Ray Tracer


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From: Ron Parker
Subject: Re: While we are talking about changes
Date: 15 Mar 2000 08:09:31
Message: <38cf8b8b$1@news.povray.org>
On Tue, 14 Mar 2000 16:24:38 -0800, Ken wrote:
>sphere{0,1) // a unit sphere at the origin

That's not a unit sphere.  It's a sphere of unit radius.

-- 
These are my opinions.  I do NOT speak for the POV-Team.
The superpatch: http://www2.fwi.com/~parkerr/superpatch/
My other stuff: http://www2.fwi.com/~parkerr/traces.html


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From: PoD
Subject: Re: While we are talking about changes
Date: 15 Mar 2000 16:28:42
Message: <38D007E5.B3C1CEB1@merlin.net.au>
cre### [at] belialrenonvus wrote:
> 
> On Tue, 14 Mar 2000, Ken wrote:
> 
> > cone{y*-.5,1,y*.5,0} // 1 unit high with a base of 1 and a point of zero
> >                      // centered at the origin
> >
> 
> so y* = 1 ? (or x* = 1?) or is it y (multiplied by) ?
> 

In POV speak
 y = <0,1,0>
so
 y*0.5 = <0,1,0>*0.5 = <0,0.5,0>
also .5 = 0.5

PoD.


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From: crewman
Subject: Re: While we are talking about changes
Date: 15 Mar 2000 19:27:55
Message: <Pine.LNX.4.10.10003151620180.23797-100000@belial.reno.nv.us>
On Tue, 14 Mar 2000, Ken wrote:

> 
> 
> cre### [at] belialrenonvus wrote:
> 
> > so y* = 1 ? (or x* = 1?) or is it y (multiplied by) ?
> 
> sphere{< 1,0, 0>, 1} = sphere{x, 1}
> 
> sphere{<-1,0, 0>, 1} = sphere{-x, 1}
> 
> sphere{< 1,1, 0>, 1} = sphere{x+y, 1}
> 
> sphere{<-1,1,-1>, 1} = sphere{-x+y+-z, 1}

Ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh ok :)


> 
> -- 
> Ken Tyler -  1300+ Povray, Graphics, 3D Rendering, and Raytracing Links:
> http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
> 
>


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From: crewman
Subject: Re: While we are talking about changes
Date: 15 Mar 2000 19:30:33
Message: <Pine.LNX.4.10.10003151622230.23797-100000@belial.reno.nv.us>
On Thu, 16 Mar 2000, PoD wrote:

> cre### [at] belialrenonvus wrote:
> > 
> > On Tue, 14 Mar 2000, Ken wrote:
> > 
> > > cone{y*-.5,1,y*.5,0} // 1 unit high with a base of 1 and a point of zero
> > >                      // centered at the origin
> > >
> > 
> > so y* = 1 ? (or x* = 1?) or is it y (multiplied by) ?
> > 
> 
> In POV speak
>  y = <0,1,0>
> so
>  y*0.5 = <0,1,0>*0.5 = <0,0.5,0>
> also .5 = 0.5


gotcha! Once I use this a few times, it'll stick :) (grabs some crazy
glue...)

 
> PoD.
> 
>


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From: Matt Giwer
Subject: Re: While we are talking about changes
Date: 16 Mar 2000 02:26:07
Message: <38D08CBF.FC42361A@ij.net>
cre### [at] belialrenonvus wrote:

> so my method of making ALL my objects at 0,0,0 and then translating them
> where I want them is umm....non-standard?:) (I swear I make everything at
> 0,0,0 then translate and rotate to where it looks right) I find it easier
> but then hehehe :)

	Should you get into animation, that is the only way to do it.
Just make variables rather than absolutes for everything that
moves. 

-- 
<A href="http://www.giwersworld.org">A free internet for a free
people.</a>


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From: Alberto
Subject: Re: While we are talking about changes
Date: 16 Mar 2000 13:23:39
Message: <38D12716.8E565F19@ma.usb.ve>
Ron Parker wrote:

> On Tue, 14 Mar 2000 16:24:38 -0800, Ken wrote:
> >sphere{0,1) // a unit sphere at the origin
>
> That's not a unit sphere.  It's a sphere of unit radius.
>

Well, the sphere with unit radius is commonly referred to as the unit
sphere.

alberto


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From: Bill DeWitt
Subject: Re: While we are talking about changes
Date: 16 Mar 2000 15:27:57
Message: <38d143cd@news.povray.org>
"Alberto" <ame### [at] mausbve> wrote :
>
> Well, the sphere with unit radius is commonly referred to as the unit
> sphere.
>

    That's why I make all my spheres with a 0.5 radius, so they will be more
reasonably called 'unit' spheres. So that like a unit box, if I copy one
exactly one unit away, they will just touch.


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From: David Fontaine
Subject: Re: While we are talking about changes
Date: 16 Mar 2000 17:22:45
Message: <38D15DC6.F25A6395@faricy.net>
Bill DeWitt wrote:

> "Francois Labreque" <fla### [at] attglobalnet> wrote :
> >
> > box {
> >     < 2.875, 5.5, 3.6333333 >
> >     < 7.142857, 9.3, 4 >
> > }
> >
>
>     Modeler syndrome.

Why, do you use box { <2+7/8,5+1/2...?

--
___     _______________________________________________
 | \     |_          <dav### [at] faricynet> <ICQ 55354965>
 |_/avid |ontaine        http://www.faricy.net/~davidf/

"The only difference between me and a madman is that I'm not mad." -Dali


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