Merge pull request #1053 from compas-dev/glft_fix

GLTF fix

Author: tomvanmele

CHANGELOG.md

@@ -37,6 +37,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Fixed uncentered viewbox in `Plotter.zoom_extents()`
 * Changed `RobotModelArtists.atteched_tool_models` to dictionary to support multiple tools.
 * Locked `sphinx` to 4.5.
+* Changed `GLTFExporter` such that generated gltfs can be viewed with webxr
 * Fixed source directory path in `compas_ghpython.uninstall` plugin.
 * Fixed bug in`compas_ghpython.components`that ignored input list of `.ghuser` objects to uninstall.
 * Fixed conversion bug of transformed `Box` in `compas_rhino.conversions`

src/compas/files/gltf/gltf_exporter.py

@@ -11,6 +11,7 @@
 from compas.files.gltf.constants import COMPONENT_TYPE_ENUM
 from compas.files.gltf.constants import COMPONENT_TYPE_FLOAT
 from compas.files.gltf.constants import COMPONENT_TYPE_UNSIGNED_INT
+from compas.files.gltf.constants import COMPONENT_TYPE_UNSIGNED_SHORT
 from compas.files.gltf.constants import NUM_COMPONENTS_BY_TYPE_ENUM
 from compas.files.gltf.constants import TYPE_MAT4
 from compas.files.gltf.constants import TYPE_SCALAR
@@ -283,6 +284,8 @@ def _add_scenes(self):
             return
         if self._content.default_scene_key is not None:
             self._gltf_dict['scene'] = self._scene_index_by_key[self._content.default_scene_key]
+        else:
+            self._gltf_dict['scene'] = list(self._content.scenes.values())[0].key
         scene_list = [None] * len(self._content.scenes.values())
         for key, scene in self._content.scenes.items():
             scene_list[self._scene_index_by_key[key]] = scene.to_data(self._node_index_by_key)
@@ -304,7 +307,7 @@ def _add_nodes(self):
     def _construct_primitives(self, mesh_data):
         primitives = []
         for primitive_data in mesh_data.primitive_data_list:
-            indices_accessor = self._construct_accessor(primitive_data.indices, COMPONENT_TYPE_UNSIGNED_INT, TYPE_SCALAR)
+            indices_accessor = self._construct_accessor(primitive_data.indices, COMPONENT_TYPE_UNSIGNED_SHORT, TYPE_SCALAR)
 
             attributes = {}
             for attr in primitive_data.attributes: