[Opensim-dev] How does PBR material scale/rotation/offset reach the viewer?

[John Nagle]

Where are the "material overrides" sent over the network?

Extra parameters on objects?

- I'm recognizing the new type for PBR material info, and it's just
an array of face indices and a UUID.

glTF content in PBR material assets?

- I've dumped a few of those, and they didn't have scale/rotation/offset 
data. The glTF spec does not show those as part of a material. They're
part of a 3D object in glTF.

- LLSD content in PBR materials?

There's an LLSD wrapper around the glTF material info (which is JSON
encoded). That could have extra parameters. But I haven't seen any.

- LLSD content in regular materials?

That's the logical place. Those are key-value pairs, and that's
where "SpecRepeatX", "NormRotation", etc. are sent to the viewer.
So adding new keys for something like "BaseColorRotation", etc.
would make sense. But I'm not seeing code in the Linden viewer, PBR 
version, to read anything new from there.

Anybody found this yet?

					John Nagle

On 7/8/23 13:26, Leal Duarte wrote:
> Think they are only on what they call the material overrides
> 
> 
> On 08-Jul-23 05:31, John Nagle wrote:
>> I'm implementing PBR in my viewer, and I haven't found yet how texture 
>> UV scale, rotation, and offset reach the viewer. They're not in the
>> texture info sent over UDP; there are no slots for that. They're
>> not in the glTF texture info; the glTF texture doesn't provide for that,
>> because it's up to the primitive that uses the material, and we don't 
>> have glTF primitives yet.  They might be in the
>> LLSD material info for regular materials.
>>
>> I've been looking in the SL viewer at
>>
>> https://github.com/secondlife/viewer/blob/DRTVWR-559-SL-17699/indra/llprimitive/llgltfloader.cpp
>>
>> and I can see those values being processed, but haven't found
>> yet where the viewer gets them.
>>
>> Anyone know?
>>
>>             John Nagle
>>             Annimts
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>