def __to_json_compatible(value):
"""Make a value (usually a custom property) compatible with json"""
if isinstance(value, bpy.types.ID):
return value
elif isinstance(value, str):
return value
elif isinstance(value, (int, float)):
return value
# for list classes
elif isinstance(value, list):
value = list(value)
# make sure contents are json-compatible too
for index in range(len(value)):
value[index] = __to_json_compatible(value[index])
return value
# for IDPropertyArray classes
elif hasattr(value, "to_list"):
value = value.to_list()
return value
elif hasattr(value, "to_dict"):
value = value.to_dict()
if gltf2_blender_json.is_json_convertible(value):
return value
return None
def generate_extras(blender_element):
"""
Filters and creates a custom property, which is stored in the glTF extra field.
"""
if not blender_element:
return None
extras = {}
# Custom properties, which are in most cases present and should not be exported.
black_list = ['cycles', 'cycles_visibility', 'cycles_curves', '_RNA_UI']
count = 0
for custom_property in blender_element.keys():
if custom_property in black_list:
continue
value = blender_element[custom_property]
add_value = False
if isinstance(value, bpy.types.ID):
add_value = True
if isinstance(value, str):
add_value = True
if isinstance(value, (int, float)):
add_value = True
if hasattr(value, "to_list"):
value = value.to_list()
add_value = True
if hasattr(value, "to_dict"):
value = value.to_dict()
add_value = gltf2_blender_json.is_json_convertible(value)
if add_value:
extras[custom_property] = value
count += 1
if count == 0:
return None
return extras