Oleguer Vilella <ole### [at] infonegociocom> wrote:
> I read the focal_point and blur_samples file on the help file.
> Can anyone me tell how can I calculate the focal_point?

  There's no need to calculate anything.
  The image will be sharpest at the specified focal_point (and every
point which is at the same distance from the camera as the focal_point).

  For example, if your camera is located at <1, 2, -3> and it's looking
at <0, 0, 0>, then if you specify a focal_point <0, 0, 0> the image
will be sharpest at the world origin (and every point which is at
the same distance from the camera as the world origin).

  If you have for example an object centered at <-2, -3, 4> and you
want that object to look sharp in the image, specify your focal_point
as <-2, -3, 4> (regardless of your camera location and look_at).

-- 
#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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