Just a minimal support to get single-mesh conversion working with
GltfSceneConverter. The whole thing has to be subsequently reworked to
not be oriented around meshes, but this is the first step.
I'm going to add quite a few features to this one, and doing that
without any regression tests whatsoever would be a misery. Same needs to
eventually be done for the imageconverter and other utils. No bugs found
here, fortunately, except for one message update -- otherwise the
verbose output would contain (1/2) but never (2/2) which may be
confusing.
At the moment the testing is done only on Unix -- originally I wanted to
postpone this until something like Utility::System::execute() is
implemented, with proper argument escaping and output redirection, but I
simply DO NOT HAVE TIME to do that properly now. So instead it's calling
into std::system(), assumes there is no whitespace in the arguments, and
assumes a Unix shell with stdout/stderr redirection to a file. Ugly and
probably way slower than necessary, but works.
It was quite a pile, and all of it was written just once, relying only
on hopefully-available model files that would hopefully touch most code
paths. Which means, extremely annoying to make changes in.
I extracted the code to a header that can be tested with a mocked-up
importer and without having to execute the utility itself, deduplicated
the image info printing code, fixed various inconsistencies (such as
data/field flags sometimes denoted with superfluous "flags:" and
sometimes not) and TODOs (such as 2D/3D skins, where there was no format
whatsoever that would have 2D skin support, so the code couldn't get
written).
Now it's finally possible to easily add the remaining missing features,
such as printing camera info.
Vladimír Vondruš