We should not use the address of a stdlib function for BufferDescriptor
callbacks. With emcc this compiles without warnings or errors, but
produces incorrect code that causes intermittent out-of-memory errors at
run time.
If the client opts in to "recomputeBoundingBoxes", then we manually
compute a bounding box that ignores the glTF min / max annotations.
This computation was erroneously including the transform of the injected
root node, which is not part of the model.
This could cause a problem when creating the asset, then immediately
positioning it with its injected root node before the ResourceLoader
is done downloading vertex buffers.
The cgltf "base path" that gets passed to cgltf_load_buffers should
actually be the path to original glTF file, otherwise bin filepaths
are resolved incorrectly.
gltfio computes two types of bounding boxes: one for renderables (used
for frustum culling) and one for the overall asset (used for
positioning the camera or asset).
Both of these are based on the min+max attributes in the glTF file, but
the asset-level box was incorrect because only two corners of the
transformed AABB were considered.
This CL also adds optional computation of bounding boxes that crawls
through the vertex positions. This is useful when diagnosing potential
issues with the asset's min+max info.
These enhancements are motivated by a culling issue seen with the voxel
Cathedral on sketchfab.
This is our new mobile-friendly and web-friendly library for loading
glTF assets. It is still a work in progress, but already capable of
loading many conformance models, including those with animation,
skinning, and a couple of extensions (nonlit and texture transforms).
Next week we will add a sample app demonstrating its usage.
