RenderMan interface and shading language

shading languages, renderman interface, renderman shading language, shader language, gl shading language

3 Ri related questions…

1. What is the syntax of RiBlobby() ?
2. What is the "NDC" space ?
3. What ‘SubdivisionMesh’ algorithms have been copyrighted (and
therefore cannot be used by other renderers) by Pixar ?

Thanks in advance..
N.Y.

Sent via Deja.com http://www.deja.com/
Before you buy.

.
posted by admin in Uncategorized and have Comments (6)

6 Responses to “3 Ri related questions…”

  1. admin says:

    nass…@hotmail.com wrote:

    > 1. What is the syntax of RiBlobby() ?

    there should be an app. note with 3.9 that describes it all.

    > 2. What is the "NDC" space ?

    "Normalized Device Coordinates", basically the ‘texture space’ of the
    screen 0.0-1.0 in each direction (regardless of aspect ratio) with the
    origin in the upper left (I think).

  2. admin says:

    In article <8j342l$9k…@nnrp1.deja.com>,  <nass…@hotmail.com> wrote:
    >3. What ‘SubdivisionMesh’ algorithms have been copyrighted (and
    >therefore cannot be used by other renderers) by Pixar ?

    None.  You can’t copyright algorithms.  You can, unfortunately,
    seem to patent them these days.

    For Pete’s sake, don’t trust USENET for anything as important
    as judging what patents you may be infringing.  You can do a
    full-text patent search at:

              http://www.patents.ibm.com/

    Search for "subdivision surface" (the Pixar patent is the first one
    listed).  This web site will sell you the full text of patents in PDF
    for, I think, $3 each.

    Also, a bit of advice about reading patents: don’t make any
    assumptions based on the abstracts — they can be notoriously
    misleading.  Read the full text very carefully.  Only the actual list
    of claims is what counts, and sometimes they are surprisingly more
    narrow than common lore about the patents would have you believe.

             – lg


    Larry Gritz                                     Pixar Animation Studios
    l…@pixar.com                                    Richmond, CA

  3. admin says:

    In article <39577D71.D9FF1…@pixar.com>,
      Doug Epps <d…@pixar.com> wrote:
    > nass…@hotmail.com wrote:

    > > 1. What is the syntax of RiBlobby() ?

    > there should be an app. note with 3.9 that describes it all.

    > > 2. What is the "NDC" space ?

    > "Normalized Device Coordinates", basically the ‘texture space’ of the
    > screen 0.0-1.0 in each direction (regardless of aspect ratio) with the
    > origin in the upper left (I think).

    I don’t have access to 3.9 documentation

    Sent via Deja.com http://www.deja.com/
    Before you buy.

  4. admin says:

    >Search for "subdivision surface" (the Pixar patent is the first one
    >listed).  This web site will sell you the full text of patents in PDF
    >for, I think, $3 each.

    Patents can be got free from http://www.uspto.gov. No need to pay.

    >Also, a bit of advice about reading patents: don’t make any
    >assumptions based on the abstracts — they can be notoriously
    >misleading.  Read the full text very carefully.  Only the actual list
    >of claims is what counts, and sometimes they are surprisingly more
    >narrow than common lore about the patents would have you believe.

    If you would tell what you have patented, would everything become crystal
    clear. Please.

    Juhana

  5. admin says:

    maj…@uta.fi (Juhana Sadeharju) writes:

    <snip>

    > >Also, a bit of advice about reading patents: don’t make any
    > >assumptions based on the abstracts — they can be notoriously
    > >misleading.  Read the full text very carefully.  Only the actual list
    > >of claims is what counts, and sometimes they are surprisingly more
    > >narrow than common lore about the patents would have you believe.

    > If you would tell what you have patented, would everything become crystal
    > clear. Please.

    Larry hasn’t patented anything. He very wisely has avoided trying to
    interpret either the content of Pixar’s patents or Pixar’s policy in
    enforcing and licensing them.

    Really, he just works there.


    -Stephen H. Westin
    Any information or opinions in this message are mine: they do not
    represent the position of Cornell University or any of its sponsors.

  6. admin says:

    In article <uituvckx5….@graphics.cornell.edu>,
    Stephen H. Westin <westin*nos…@graphics.cornell.edu> wrote:

    - Hide quoted text — Show quoted text -

    >maj…@uta.fi (Juhana Sadeharju) writes:

    ><snip>

    >> >Also, a bit of advice about reading patents: don’t make any
    >> >assumptions based on the abstracts — they can be notoriously
    >> >misleading.  Read the full text very carefully.  Only the actual list
    >> >of claims is what counts, and sometimes they are surprisingly more
    >> >narrow than common lore about the patents would have you believe.

    >> If you would tell what you have patented, would everything become crystal
    >> clear. Please.

    >Larry hasn’t patented anything. He very wisely has avoided trying to
    >interpret either the content of Pixar’s patents or Pixar’s policy in
    >enforcing and licensing them.

    >Really, he just works there.

    I knew all this already, really! Now back to topic!

    Juhana