I was testing a code I found in this post (HDR Sky_sphere:
http://news.povray.org/povray.general/message/%3Cop.vo12kld5ufxv4h%40xena%3E/#%3Cop.vo12kld5ufxv4h%40xena%3E)
and I noticed if I hide the hdr image using the no_image attribute the caustics
create by the environment light is lose.

The environment light I'm using:
sphere{0,1
   pigment{
      image_map{hdr "hdri\stpeters_probe-env.hdr"
         gamma 1.2
         map_type 1     // Spherical
         interpolate 2  // Bilinear
      }
   }
   rotate<0,40.0,0>
   finish{
      emission 1.0
      ambient 0
      diffuse 1
   }
   scale 10000 // make sure the sphere is big enough to cover the whole scene
   hollow
   no_image   ****
}

in the image bellow at left we see the rendered image with the "no_image"
commented and the right with it uncommented:
http://i1330.photobucket.com/albums/w578/Micheus/Wings3D%20-%20Forum%20III/teste_zpsrkl86nlp.png

I tryed many things, but it seems to be a kind of "bug" since the same light
still is lighting the scene.

Thanks for any advise.

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