"Non boned" Collada meshes should support multiple prop/attachment points

[Mythos_Ruler]

It is imperative to the game as designed that the game engine supports "static" "non-boned" Collada files, such as those created for ships and buildings, that include multiple prop-points. This is mainly for unit garrisoning purposes (units garrisoned on walls, battlements, towers, and on the decks of ships).

I am slating this for Beta, because for Alpha we could conceivably get by with just simple garrisoning capability without the propping. But for any public beta this feature should be implemented, as it is a major stated feature of the project.

[Philip]

Copying description from #191:

Let prop points be specified on non-skeletal models. The engine supports that already, when you set the bone index to 0xFF. The COLLADA converter should look for objects named prop-* attached to the geometry. Might as well support non-boned prop points on skeletal models, too.

[Philip]

See source/collada/PMDConvert.cpp (the FCDEntity::GEOMETRY case) for the relevant code. Currently it just adds a prop point called "root" at (0,0,0), which is sufficient for basic uses, but it should still be extended to handle user-defined prop points.

[Lys]

Where could I find an example of static non-boned collada file with user-defined prop points ? Yet it's not possible to copy the "controller case" code since it looks for a skeleton.

[Philip]

Hmm, I think I actually did most of this yesterday (while wasting time importing models from Spring) - I'll attach my current patch. But I haven't tested it with any real models and I don't know if it works exactly like it should.

I don't remember any existing example files, but it seems fairly easy to create one in Blender: create two objects, then select one and use the Object panel -> Relations -> Parent and set it to other object then export. It would be good to have an example of a real game model to test this on.

[philip]

(In [8005]) Add barely-tested support for prop points on static meshes (see #243 - needs more testing). Automatically triangulate meshes.

[ben]

(In [10484]) Fixes PMD converter's handling of static prop points. Coordinate conversion was not performed correctly according to the model's up-axis orientation. Fixes #886, #243.