glTF exporter: add bufferView Target at export

io_scene_gltf2/__init__.py

@@ -4,7 +4,7 @@
 bl_info = {
     'name': 'glTF 2.0 format',
     'author': 'Julien Duroure, Scurest, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
-    "version": (3, 3, 21),
+    "version": (3, 3, 22),
     'blender': (3, 3, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',

io_scene_gltf2/blender/exp/gltf2_blender_gather_primitive_attributes.py

@@ -44,7 +44,7 @@ def array_to_accessor(array, component_type, data_type, include_max_and_min=Fals
         amin = np.amin(array, axis=0).tolist()
 
     return gltf2_io.Accessor(
-        buffer_view=gltf2_io_binary_data.BinaryData(array.tobytes()),
+        buffer_view=gltf2_io_binary_data.BinaryData(array.tobytes(), gltf2_io_constants.BufferViewTarget.ARRAY_BUFFER),
         byte_offset=None,
         component_type=component_type,
         count=len(array),
@@ -142,7 +142,7 @@ def __gather_colors(blender_primitive, export_settings):
                 comp_type = gltf2_io_constants.ComponentType.Float
 
             attributes[color_id] = gltf2_io.Accessor(
-                buffer_view=gltf2_io_binary_data.BinaryData(colors.tobytes()),
+                buffer_view=gltf2_io_binary_data.BinaryData(colors.tobytes(), gltf2_io_constants.BufferViewTarget.ARRAY_BUFFER),
                 byte_offset=None,
                 component_type=comp_type,
                 count=len(colors),

io_scene_gltf2/blender/exp/gltf2_blender_gather_primitives.py

@@ -150,7 +150,7 @@ def __gather_indices(blender_primitive, blender_mesh, modifiers, export_settings
         return None
 
     element_type = gltf2_io_constants.DataType.Scalar
-    binary_data = gltf2_io_binary_data.BinaryData(indices.tobytes())
+    binary_data = gltf2_io_binary_data.BinaryData(indices.tobytes(), bufferViewTarget=gltf2_io_constants.BufferViewTarget.ELEMENT_ARRAY_BUFFER)
     return gltf2_blender_gather_accessors.gather_accessor(
         binary_data,
         component_type,

io_scene_gltf2/io/com/gltf2_io_constants.py

@@ -118,6 +118,9 @@ class TextureWrap(IntEnum):
     MirroredRepeat = 33648
     Repeat = 10497
 
+class BufferViewTarget(IntEnum):
+    ARRAY_BUFFER = 34962
+    ELEMENT_ARRAY_BUFFER = 34963
 
 #################
 # LEGACY DEFINES

io_scene_gltf2/io/exp/gltf2_io_binary_data.py

@@ -9,10 +9,11 @@ from io_scene_gltf2.io.com import gltf2_io_constants
 class BinaryData:
     """Store for gltf binary data that can later be stored in a buffer."""
 
-    def __init__(self, data: bytes):
+    def __init__(self, data: bytes, bufferViewTarget=None):
         if not isinstance(data, bytes):
             raise TypeError("Data is not a bytes array")
         self.data = data
+        self.bufferViewTarget = bufferViewTarget
 
     def __eq__(self, other):
         return self.data == other.data
@@ -21,9 +22,9 @@ class BinaryData:
         return hash(self.data)
 
     @classmethod
-    def from_list(cls, lst: typing.List[typing.Any], gltf_component_type: gltf2_io_constants.ComponentType):
+    def from_list(cls, lst: typing.List[typing.Any], gltf_component_type: gltf2_io_constants.ComponentType, bufferViewTarget=None):
         format_char = gltf2_io_constants.ComponentType.to_type_code(gltf_component_type)
-        return BinaryData(array.array(format_char, lst).tobytes())
+        return BinaryData(array.array(format_char, lst).tobytes(), bufferViewTarget)
 
     @property
     def byte_length(self):

io_scene_gltf2/io/exp/gltf2_io_buffer.py

@@ -35,7 +35,7 @@ class Buffer:
             extensions=None,
             extras=None,
             name=None,
-            target=None
+            target=binary_data.bufferViewTarget
         )
         return buffer_view