POV-Ray : Newsgroups : povray.general : QTVR panoramas: conclusion and examples : Re: QTVR panoramas: conclusion and examples Server Time
4 Aug 2024 12:14:16 EDT (-0400)
  Re: QTVR panoramas: conclusion and examples  
From: Warp
Date: 6 Jul 2003 13:21:41
Message: <3f085aa5@news.povray.org>
Tim Cook <z99### [at] bellsouthnet> wrote:

> being spherical, not cylindrical.  (At least, I *think* the number is
> 64800, calculation could be wrong)

  No. Degrees (and radians) are used only to measure 2-dimensional angles.
You can't measure spatial angles (I think that the mathematical term
is "solid angle") with degrees.

  Solid angles are measured in steradians. The solid angle subtended by
a surface is defined as the surface area of a unit sphere covered by
the surface's projection onto the sphere.
  The solid angle corresponding to all of space being subtended
is 4*pi steradians.

-- 
#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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