[sldev] [SNOW] Problems with high resolution textures

[Harleen Gretzky]

I moved VWR-14180 to SNOW-48 this afternoon, it was originally SNOW-30.

On Sun, Jun 21, 2009 at 1:30 AM, Gordon Wendt <GordonWendt at gmail.com> wrote:

> There's also a really popular misfiled (at vwr instead of snow) at
> http://jira.secondlife.com/browse/VWR-14180 that's about this problem just
> an fyi.
>
> -Gordon
>
> On Sun, Jun 21, 2009 at 1:04 AM, Sheet Spotter <sheet.spotter at gmail.com>wrote:
>
>>  An enhancement in the Snowglobe viewer may be responsible for problems
>> with high resolution textures. I’m hoping someone in SLDev can confirm this
>> and start the search for solutions.
>>
>>
>>
>> Two examples of this problem are SNOW-45 (some large textures do not
>> render properly) and SNOW-48 (textures not resolving on megaprims).
>>
>>
>>
>> The Texture Console provided a clue to the underlying cause. In SNOW-45
>> and SNOW-48 when you zoom in on the objects the “Area” column in the Texture
>> Console seems to be artificially limited to 4,096 or 65,536 for the
>> misbehaving textures. (You need to right-click and edit the object to see
>> its textures highlighted in the Texture Console.) In some cases the Area
>> value actually drops when you zoom in.
>>
>>
>>
>> The new Snowglobe viewer includes optimizations that reduce the detail in
>> textures that are “not important to the camera”. This seems to be aimed at
>> improving memory utilization by limiting the use of large textures when they
>> have no benefit. For example, when a face is “less important” it will be
>> drawn with only a 64x64 texture (that’s where the 4,096 comes from). Larger
>> faces that are less important may be drawn with a 256x256 texture (that’s
>> the 65,536 value).
>>
>>
>>
>> In the Snowglobe source code the LLFace::calcImportanceToCamera method
>> determines how important each face is in the avatar’s camera, and the
>> LLFace::getTextureVirtualSize method imposes limits on the texture size
>> based on this importance. (The value returned by getTextureVirtualSize is
>> displayed in the Area column in the Texture console.) One of these two
>> methods seems to be responsible for limiting the detail in the textures
>> displayed in SNOW-45 and SNOW-48.
>>
>>
>>
>> I hope someone more experienced in this area of the code can confirm these
>> findings, and further the cause by proposing possible solutions. A simpler
>> explanation of these findings will be added as a comment to SNOW-48.
>>
>>
>>
>>
>>
>> Sheet Spotter
>>
>>
>>
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>
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