[Bf-usd] Support for Preliminary_Text

[Charles Wardlaw]

Hi John,

That sounds like a neat addition.  Reading over their description, a few
questions come to mind:

- How large is a "point" in DCC units?  Can this be specified somehow?
- Is the text intended to be converted to polygons for rendering, or is it
intended to be displayed in a resolution-independent way like an SDF font?
- If the text is intended to be converted to polygons, how does the author
specify subdivision or font spline to polygon conversion?
- How do I specify or override properties on a per-character level?
- Are width and height in scene units, as is depth?


~ Charles




On Tue, Apr 19, 2022 at 7:51 AM John Harrison via Bf-usd <bf-usd at blender.org>
wrote:

> Hi, I’m a software developer (never contributed to blender) motivated
> (possibly?) to implement USD export support for one of Apple’s schema
> additions, namely Preliminary_Text:
> https://developer.apple.com/documentation/arkit/usdz_schemas_for_ar/preliminary_text
>
> My motivation is to allow a designer to create a USD file with text that
> contains the text *attributes*, not the final mesh (though I supposed it
> could do both). This would allow software to pull the attributes from the
> USD file at runtime, including xForm, material, font-family, etc., and use
> these attributes to render dynamic text at runtime with the same text
> *attributes* the designer intended. Think 3D user interface where text
> may change based on a view model.
>
> Apple is thinking along these lines but, after diving into their tools,
> there seems to be more concept than implementation. They are pushing
> Reality Composer but I find it more a broken toy than a tool, so I am
> turning to blender.
>
> Thoughts? Questions?
>
> Best,
> John Harrison
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