Simon.Mills++at++esa.int
Date: 09/12/2005 23:34:24
I would like to report another BUG with the OpenFlight loader on Linux:
The flags for pallete overrides on external (file) references are incorrectly
interpreted when the flags for use external reference Light Source palette OR
Shader palette are on.
i.e. if EITHER of these are ON then the other colour/material/texture palette
overrides are IGNORED which produces incorrect rendered models with strange
materials and textures compared to the original models in Creator 3.0 (this
took me ages to track down).
Note: This happens ONLY ON LINUX (not IRIX) for models created in Creator 3.0
even when outputting models in OpenFlight 15.7 or 15.8 (which should be 100%
compatible with the Performer OpenFlight loader).
I agree with Gordon, the 15.8 was not fully supported by Performer and it
seems the compatability with 16.0 is not 100%. So, PLEASE can we see the OF
loader updated and the bugs fixed (at least the Linux version is buggy)????
Our success is dependent on a good transfer from the modelling environment to
the run-time environment and Linux is increasingly becoming the OS of choice.
BTW, the other bug (again only on Linux) is incorrect colours on models if
colours in the colour palette are given NAMES.
Regards, Simon
_______________________________________________________________________
Simon Mills
Silicon Worlds S.A.
c/o Modelling & Simulation Section (TEC-SWM) Tel: +31 (0)71 565 3725
European Space Agency (ESA/ESTEC) Fax: +31 (0)71 565 5420
Postbus 299, 2200AG Noordwijk e-mail: Simon.Mills++at++esa.int
The Netherlands http://www.estec.esa.nl/wmwww/EMM
_______________________________________________________________________
|---------+------------------------------------------->
| | Gordon Tomlinson |
| | <gordon++at++thesmeghead.com> |
| | Sent by: |
| | owner-info-performer++at++performer.e|
| | ngr.sgi.com |
| | |
| | |
| | 09/09/2005 01:46 |
| | |
|---------+------------------------------------------->
>---------------------------------------------------------------------------------------------------------|
| |
| To: "'Alexandre Naaman'" <naaman++at++gmail.com>, "'Jason Daly'" <jdaly++at++ist.ucf.edu> |
| cc: "'Vincent Pasqualato'" <vincent.pasqualato++at++oktal.fr>, info-performer++at++sgi.com |
| Subject: RE: [info-performer] Fw: Flt loader with shaders. |
>---------------------------------------------------------------------------------------------------------|
Uhmm beware
15.8 is much much more than a fix release , 15.8 took over the major
responsibilities of storing light point data from Vega/Vega Prime for one,
this is a big change
16.0 added more as well
Best Regards
Gordon
___________________________________
Gordon Tomlinson
Email : gordon++at++3dscenegraph.com
Forums : 3dScenegraph Forums
FAQs : OSG - Vega - Performer - Vega Prime - Creator
-----Original Message-----
From: owner-info-performer++at++performer.engr.sgi.com
[mailto:owner-info-performer++at++performer.engr.sgi.com] On Behalf Of Alexandre
Naaman
Sent: Thursday, September 08, 2005 11:30 PM
To: Jason Daly
Cc: Vincent Pasqualato; info-performer++at++sgi.com
Subject: Re: [info-performer] Fw: Flt loader with shaders.
Hi Jason, Vincent,
You're correct, we haven't updated the loader since version 15.7.
At first glance it looks like v15.8 is mostly a fix release (15.7 was buggy,
if you can believe that a spec can be buggy) and version 16.0 has added
support for shaders (Cg, CgFX and GLSL).
If anyone here has flt files that require these mods please send them my
way and I'll file a bug and we'll see what can be done for future releases
of Performer.
A+,
Alex.
On Sep 7, 2005, at 7:13 AM, Jason Daly wrote:
> Vincent Pasqualato wrote:
>
>
>> Hi !
>>
>> Trying to combine a shader program written in GLSL with a
>> Performer scene
>> graph, we discovered that rendering an flt object with faces which
>> are flats
>> (no gouraud/interpolation, no vertex normals) gives us strange
>> results :
>> The flt loader seems to try some computation of vertex normals,
>> because
>> there is a variation of the normal we get from Open GL (in gl_Normal
>> parameter of the shader program) across the faces. Plus, this
>> interpolation
>> is buggy, resulting in very strange patterns of normals on the
>> object.
>> If we transform our object in gouraud, and pre-compute the vertex
>> normals,
>> the rendering is OK, except we don't get the flat faces we would
>> want.
>> Does anyone have a suggestion about this behaviour ? Is there an
>> option to
>> deactivate this normal computation ? Or is it correct, assuming
>> the classic
>> OpenGL pipeline doesn't take into account vertex normals when
>> rendering flat
>> faces ?
>>
>>
>
> There is supposed to be:
>
> pfdConverterMode_flt(PFFLT_COMPUTENORMALS, PF_OFF);
>
> but last time I tried, it didn't work.
>
>
>> Also, another problem with flt loader and Shaders is the fact that
>> the
>> loader seems to make some pre-computation on vertex colors and face
>> materials : vertex colors seems to be multplicated by the diffuse
>> color of
>> the faces, and ambient and diffuse color of the face seem also to be
>> affected by the color of the vertex. Although this doesn't affect
>> classic
>> OpenGL rendering, it is incompatible with our shader, which make a
>> different
>> use of this colors and need them untransformed.
>>
>>
>
> I think there's supposed to be a mode for this as well, but I can't
> pick it out just from the pfflt.h file (and it probably wouldn't
> work anyway). Performer used to ship with the pfdConverterMode_flt
> man page, but no longer. The loader is also several years out of
> date (I think it's only good for versions 15.7 and earlier). I
> know MPI stopped supporting their Performer loader a while ago, and
> SGI hasn't kept up with OpenFlight versions since 15.7.
>
> --
>
> --"J"
>
> "I'm a castaway stranded in a desolate land,
> I can see the footprints in the virtual sand."
> --Neil Peart
>
> ----------------------------------------------------------------------
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