Another reason this was done is that not all 3DS file writers
write out 3DS files with all face normals facing in the same
direction. When this happens, you get an object that appears
to be missing every other face, depending on the viewpoint.
At 12:07 PM 5/16/2000 -0500, Steve Pietrowicz wrote:
>I looked into this a bit, and sent Joel and e-mail, but I thought you all
>might interested:
>
>
>I looked into this a bit (I didn't write it...a student did quite a while
>ago), and it appears that in the 3DS loader, we have backface culling set
>to NONE, and setBackFaceNormal to TRUE. I believe this was done so that
>some models which aren't enclosed (like half a sphere) will render
>correctly. So, basically, no culling is occurring. This would account
>for the slowdown.
>
>I'll look into adding a property to prevent this from happening for all
>models.
>
>
>At 11:52 AM 5/16/2000 -0700, J. Lee Dixon wrote:
>>I am currently experimenting with several of the model format loaders (OBJ
>>loader from the Sun utils, and 3DS from NCSA). I noticed that even small
>>models rendered very slowly (10fps) when loaded in 3DS versus the same file
>>in OBJ format. Specifically, I am using a free model of a dolphin which
>>can be found at Flashfire: http://www.flashfire.com/free3dm.htm. The OBJ
>>version renders near 30 fps.
>>
>>Has anyone else seen this? What could be causing this large difference?
>>
>>J. Lee Dixon
>>Software Engineer
>>SAIC - Celebration, FL
>>[EMAIL PROTECTED]
>>407-566-1438
>>
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