Lean on the excellent pre-existing support for creating multiple glTF
meshes from a single FBX mesh based on material type. All the triangles
with (at least one) non-opaque vertex get flagged as transparent
material. They will all go separately in their own mesh after the
CreateMaterialModels() gauntlet.
Fixes#25.
Everything's in place to drop the progressive morph calculations into
readAnimations(). Shouldn't be hard.
Normals are proving trickier. I'm not convinced they make it into the
FBX at all. The SDK reports the existence of normals in the primary
layer, but they seems to consist exclusively of zeroes.
We may have to compute them.
- This does not support progressive morphs. Still evaluating whether
that's required functionality. It's really just a little bit of more
work. An example implementation is available in the SDK samples.
- We're blithely ignoring NORMALs and TANGENTs. This almost certainly
has to change.
* Further improvemens to texture resolution.
- Move towards std::string over char * and FbxString where convenient,
- Make a clear distinction between textures whose image files have been
located and those who haven't; warn early in the latter case.
- Extend RawTexture so we always know logical name in FBX, original file
name in FBX, and inferred location in local filesystem.
- In non-binary mode, simply output the inferred local file basename as
the URI; this will be the correct relative path as long as the texture
files are located next to the .gltf and .bin files.
Primary remaining urge for a follow-up PR:
- We should be copying texture image files into the .gltf output folder,
but before that we should switch to an off-the-shelf cross-platform
file manipulation library like https://github.com/cginternals/cppfs.
When we make that transition, all this texture resolution code will
undergo another refactoring.
We were mapping v to -v rather than 1-v, with fairly catastrophic
results. While fixing, take the trouble to introduce a more general
transformation mechanism than just an affine matrix.
Par Winzell
Pär Winzell