Re: [info-performer] need help on pfGeoSet and triangle mesh

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From: Zorana Mayooran (Zorana.Mayooran++at++med.monash.edu.au)
Date: 10/05/2004 16:41:56

Hi Paolo,

I am using the pfflt loader and have the same problem as Raymond in that
I need to work with PFGS_TRIS but can't because performer loads my model
as PFGS_TRISTRIPS. I had a look through all the documentation available
(including the pfflt loader and pfdGeoBuilder) but couldn't find how I
can tell performer to load my model as PFGS_TRIS and not PFGS_TRISTRIPS.
Do you have any ideas on how this can be done?

Thanks.

Regards,
Zorana.

Paolo Farinelli wrote:

> Hello Raymond,
>
> the source code for the .iv loader is shipped with Performer and
> can be found in /usr/share/Performer/src/lib/libpfdb/libpfiv.
> (or %PFROOT%\Src\lib\libpfdb\libpfiv on Win32).
>
> You may also need to look into the source for libpfdu as I believe
> the iv loader uses the pfdGeoBuilder API to create its geometry.
>
> Hope this helps.
> Regards,
> Paolo
>
>
> Pei Chen wrote:
>
>> Hey, everybody,
>> I have some questions regarding to pfGeoSet and loading a *.iv file
>> into a
>> pfGeoSet here.
>>
>> I have an Inventor file (*.iv) which specifies an indexed triangle
>> mesh. I
>> use pfdLoadFile() to load the mesh data into the performer. later in my
>> project, I need to access individual vertex using the corresponding
>> index.
>> It seems that, however, Performer dose some optimization to the mesh
>> data
>> such and the indics of the mesh vertics are different than those
>> specified
>> in the .iv file.
>> For example, in the .iv file, it says a triangle face is formed by
>> vertics
>> 0,1,2, but after I load it into the pfGeoSet object, the Performer says
>> the
>> same triangle face is formed by vetics 4, 5, 6.
>>
>> There is another problem with the pfGeoSet. It seems Performer also
>> changes
>> the number of vertics when it loads in the mesh data from .iv file. For
>> instance, in the .iv file, 8 vertics are specified. But when i load it
>> into
>> the pfGeoSet, it splits some vertics and the number of vertics
>> changes to
>> 18.
>>
>> The last problem is the primitive type. I really want the Performer
>> treat
>> my
>> mesh data as PFGS_TRIS type, that is triangle mesh, but when i use
>> pfdLoadFile() to load in the mesh data, Performer always treats my mesh
>> data
>> as PFGS_FLAT_TRISTRIPS, that is flat triangle strip mesh. Is there
>> any way
>> to tell Performer that I want PFGS_TRIS intead of PFGS_FLAT_TRISTRIPS.
>> I tried the pfGeoSet->setPrimType(), but it dosen't work.
>>
>> So, what I want to know is what exactly happen when I load in a .iv mesh
>> data using pfdLoadFile().
>>
>> Thanks.
>>
>> Raymond
>>
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>>
>>
>>
>>
>
>

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