Alf Peake <alf### [at] peake42freeservecouk> wrote:
> For this aspect ratio I would also suggest adding this inside your 
> camera{} block:  right x*image_width/image_height

  That should be used with care.

  Automatic aspect ratio adjustment can change the viewing area in
unexpected ways when the resolution is changed (well, more precisely
the aspect ratio of the rendered image is changed). Inadverted changes
in the viewing area can cause unwanted results if parts of the scene
which should not appear in the image suddenly come into view or if
important parts of the scene suddenly go out of view.

  Also the combination of that command with other camera parameters
can cause unexpected results. For instance, if 'angle' is used in
addition to that 'right', the automatic aspect ratio correction will
behave differently ('angle' fixes the horizontal viewing area and
it will no longer be affected by 'right', which will start affecting
the *vertical* viewing area).

  Also, that form of the automatic aspect ratio correction works only
if you really want *square* pixels. While that is usually the case,
it's not universal. There are some applications where anamorphic
images (non-square pixels) are needed.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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