Francois Labreque <fla### [at] videotronca> wrote:
: Instead of having the camera right:up vector ratio default to 4:3 and
: providing image_height and image_width built-in variables so that we can
: adjust the value of the vectors to match the image aspect ratio, why not
: have it default to image_width:image_heigth?

  I have explained this in
http://www.students.tut.fi/~warp/povVFAQ/languageVFAQ.html#aspectratio

  The biggest problem of having POV-Ray set automatically the aspect ratio
of the camera to match the aspect ratio of the final image is that:

  1) There isn't an unambiguous way of doing it. There are basically two
ways of doing it (and counting all the in-between mixes of the two we get
an infinite amount of variations): Stretching the camera vertically or
horizontally. Which one is the correct? Or a mix of both?

  2) Rendering the image with another aspect ratio than the camera will
either hide details (part of the scene will be left out) or show extra
details (part of the scene from outside the camera view will kick in),
which can be sometimes unwanted. With the current behaviour you always
get the intended image, no matter what is the aspect ratio of the image.

-- 
#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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