Go to p.b.i and see the post titled: "Wierd results with circular area
light..."

Either I haven't done something properly, or the orient keyword does
not give the effect of a spherical shaped area light. I also have some
really nasty artifacts in the edges of my image, in the patterns of
cast shadows.

So far, no one has come up with a reasonable solution for the apparent
failure of the orient keyword. No one has even commented at all about
the strange artifacts. I'm posting this note here for those that might
have some interest in the orient keyword, but haven't checked p.b.i
yet. The source for the image is posted in povray.text.scene-files, in
case anyone wants to see it.

Please help me figure out, not only the apparent failure of the orient
keyword, but help me figure out what those nasty artifacts are in the
shadows.

Thank you,
Glen Berry

Post a reply to this message

Good to see Juha L. came up with a solution.  I had almost taken the script to
try just such a fix myself but then had second thoughts since it seemed
implausible, or at least possibly not a 100% one anyway.  There wouldn't have
been anything much else to try except to speculate more on what might have been
wrong.  'adaptive' and 'jitter' were two other things I was going to check.

Bob

"Glen Berry" <7no### [at] ezwvcom> wrote in message
news:xDu1ODXQqvy2MjNuxYq=Ua4liOIp@4ax.com...
| Go to p.b.i and see the post titled: "Wierd results with circular area
| light..."
|
| Either I haven't done something properly, or the orient keyword does
| not give the effect of a spherical shaped area light. I also have some
| really nasty artifacts in the edges of my image, in the patterns of
| cast shadows.
|
| So far, no one has come up with a reasonable solution for the apparent
| failure of the orient keyword. No one has even commented at all about
| the strange artifacts. I'm posting this note here for those that might
| have some interest in the orient keyword, but haven't checked p.b.i
| yet. The source for the image is posted in povray.text.scene-files, in
| case anyone wants to see it.
|
| Please help me figure out, not only the apparent failure of the orient
| keyword, but help me figure out what those nasty artifacts are in the
| shadows.
|
| Thank you,
| Glen Berry

Post a reply to this message

Ha! What a fool I can be.  I was only looking at the 'light_source' part and not
the rest of the scene before.  I tried the script from the p.t.s-f. group and to
my surprise it was on a wall (relatively speaking) not a floor as I had
imagined.  So really Juha L.'s "fix" isn't one after all.

// Circular Area Light, with orient? [yes! if you orient the light as usual too]
light_source { 0
                            color rgb 1
                            area_light <40, 0, 0>,<0, 40, 0> 9, 9
                            circular
                            orient
                            adaptive 1
                            jitter
                            translate -z*30
                         }

Here it is with the x and y axis specified in order to align the light with the
z plane which is where those cylinders are protruding away from.  So the light
source is simply put into the same orientation as the wall where the shadows
are.  A very simple mistake, however if a person were to believe the 'circular'
and 'orient' keywords to be a facsimile for making a spherical light source then
they quite obviously would be wrong judging by this example.

Bob

"Bob Hughes" <omn### [at] hotmailcom?subject=PoV-News:> wrote in message
news:38b56a76@news.povray.org...
| Good to see Juha L. came up with a solution.  I had almost taken the script to
| try just such a fix myself but then had second thoughts since it seemed
| implausible, or at least possibly not a 100% one anyway.  There wouldn't have
| been anything much else to try except to speculate more on what might have
been
| wrong.  'adaptive' and 'jitter' were two other things I was going to check.
|
| Bob
|
| "Glen Berry" <7no### [at] ezwvcom> wrote in message
| news:xDu1ODXQqvy2MjNuxYq=Ua4liOIp@4ax.com...
| | Go to p.b.i and see the post titled: "Wierd results with circular area
| | light..."
| |
| | Either I haven't done something properly, or the orient keyword does
| | not give the effect of a spherical shaped area light. I also have some
| | really nasty artifacts in the edges of my image, in the patterns of
| | cast shadows.
| |
| | So far, no one has come up with a reasonable solution for the apparent
| | failure of the orient keyword. No one has even commented at all about
| | the strange artifacts. I'm posting this note here for those that might
| | have some interest in the orient keyword, but haven't checked p.b.i
| | yet. The source for the image is posted in povray.text.scene-files, in
| | case anyone wants to see it.
| |
| | Please help me figure out, not only the apparent failure of the orient
| | keyword, but help me figure out what those nasty artifacts are in the
| | shadows.
| |
| | Thank you,
| | Glen Berry
|
|

Post a reply to this message