Alain <ele### [at] netscapenet> wrote:
> A possibility is to surround the objects that you want to outline with a very
slightly larger, 
> transparent version of itself.

  That's just not possible in the general case. A simple 'scale' won't do.

-- 
                                                          - Warp

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There is another attempt for cartoon like povray renders -
http://www-inst.eecs.berkeley.edu/~dtw/pov/misc/_povsrc/ .

Look after outline1.pov to outline3.pov.

Its similar to Thibaut's object-based toon shading approach IIRC.

David Wallace did some other very nice images too -
http://www.ocf.berkeley.edu/~dtw/3D_Graphics/index.html .


Norbert Kern

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Thanks for the help here guys!  I actually tried the technique of drawing an
object twice, 1) scaling it a bit smaller for my textured object  & 2) using
the interior_texture of black for the 'other' object.

It looks good.  Although it might look a little strange though depending on
the camera view- it seems I will get an outline of varying width.

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Warp nous apporta ses lumieres en ce 14/06/2006 05:11:
> Alain <ele### [at] netscapenet> wrote:
>> A possibility is to surround the objects that you want to outline with a very
slightly larger, 
>> transparent version of itself.
> 
>   That's just not possible in the general case. A simple 'scale' won't do.
> 
I know that. In the case of any CSG object, each element have to be individualy
enlarged and 
combined in a merge. In the case of a blob or isosurface, you can alter the thresshold
value slightly.

-- 
Alain
-------------------------------------------------
Stoicism: This shit is good for me.

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On Wed, 14 Jun 2006 16:20:26 -0500, peter wrote:

> Thanks for the help here guys!  I actually tried the technique of drawing
> an object twice, 1) scaling it a bit smaller for my textured object  & 2)
> using the interior_texture of black for the 'other' object.
> 
> It looks good.  Although it might look a little strange though depending
> on the camera view- it seems I will get an outline of varying width.

One trick that I picked up in a GIMP tutorial is to take the image after
it's rendered and load it up in an image editor (like GIMP); duplicate the
layer and blur it (I often use 5x5 IIR blur for something like this, but
it depends on the image size and characteristics as to what's effective),
invert (ie, photo negative) the blurred layer and set the transparency to
50% for that layer; the result is a grey image that has outlines of
what's the image.  Tweak the thresholds to give you an image that looks
to be moving to black & white, convert to greyscale, and then adjust the
thresholds until it looks right.  If done right, the result usually will
look like a pencil drawing.

Example at:

http://hendersj.dyndns.org/modules/Photo_Albums/Raytraced-Images/spikeball_fb_800_outline

The original raytraced image is at:

http://hendersj.dyndns.org/modules/Photo_Albums/Raytraced-Images/spikeball_fb_800

For comparison.

Jim

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Just in case anyone tried to look at the images and couldn't, almost
immediately after I posted the links, my DSL line croaked on me; it's back
now, but it might be intermittant while the provider tries to identify
what the issue is/was.

Jim

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connection doesn't work, Jim.

Norbert Kern

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On Fri, 16 Jun 2006 07:43:02 -0400, Norbert Kern wrote:

> connection doesn't work, Jim.

Almost as soon as I posted that, it croaked again. <sigh>  A very stable
connection in general, but when it has problems, they seem to never end.

Jim

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"Jim Henderson" <nos### [at] nospamcom> wrote in message 
news:pan### [at] nospamcom...
> On Fri, 16 Jun 2006 07:43:02 -0400, Norbert Kern wrote:
>
>> connection doesn't work, Jim.
>
> Almost as soon as I posted that, it croaked again. <sigh>  A very stable
> connection in general, but when it has problems, they seem to never end.

       I'm getting both at 19:13 GMT - all is well here in the UK.

         ~Steve~



>
> Jim

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On Fri, 16 Jun 2006 19:15:55 +0100, St. wrote:

> 
> "Jim Henderson" <nos### [at] nospamcom> wrote in message
> news:pan### [at] nospamcom...
>> On Fri, 16 Jun 2006 07:43:02 -0400, Norbert Kern wrote:
>>
>>> connection doesn't work, Jim.
>>
>> Almost as soon as I posted that, it croaked again. <sigh>  A very stable
>> connection in general, but when it has problems, they seem to never end.
> 
>        I'm getting both at 19:13 GMT - all is well here in the UK.

Good, thanks Steve, it seems to have gotten better today - finally reached
someone at the provider who can get it looked into (took a letter to the
CEO to get it acknowledged and his office indicated they had no record of
a problem, so now someone is actively looking into it.).

Jim

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