pointer animation parsing fails

[pzgulyas]

I get the following error reading the AnimatedColorsCube from the glTF-Sample-Assets repo:

Error converting value "pointer" to type 'glTFLoader.Schema.AnimationChannelTarget+PathEnum'. Path 'animations[0].channels[2].target.path', line 80, position 22.

[bghgary]

This asset uses KHR_animation_pointer which is not supported in this loader.

[pzgulyas]

Do you by chance have a suggestion, where could I start looking to add code in this loader for being able to parse this pointer as a string?

[bghgary]

The schema generator uses some custom logic to convert the anyOf property of the glTF schema into an enum.

glTF-CSharp-Loader/GeneratorSchema/Schema.cs

Lines 176 to 263 in 41d9b6b

	/// <summary>
	/// Json schema properties that contain an "anyOf" object are used as
	/// enumerations in glTF 2.0.
	///
	/// This method searches the array of dictionaries in the "anyOf"
	/// object for the dictionary with the key "type" and extracts the type
	/// string from its value.
	/// </summary>
	public void SetTypeFromAnyOf()
	{
	foreach (var dict in this.AnyOf)
	{
	if (dict.ContainsKey("type"))
	{
	if (this.Type == null)
	{
	this.Type = new List<TypeReference>();
	}
	this.Type.Add(new TypeReference { IsReference = false, Name = dict["type"].ToString() });
	break;
	}
	}
	}
	/// <summary>
	/// Json schema properties that contain an "anyOf" object are used as
	/// enumerations in glTF 2.0.
	///
	/// This method requires that the type of the enumeration has been set.
	///
	/// For each dictionary in the "anyOf" array, this method extracts the
	/// list of enumerations and appends the first element of the "enum"
	/// array to the Schema enum list.
	///
	/// Additionally, when the enumeration is of type integer, the
	/// "description" object value is appended to the Schema enum name list.
	/// </summary>
	public void SetValuesFromAnyOf()
	{
	if (this.Enum == null)
	{
	this.Enum = new List<object>();
	}
	if (this.Type?[0].Name == "integer" && this.EnumNames == null)
	{
	this.EnumNames = new List<string>();
	}
	foreach (var dict in this.AnyOf)
	{
	if (dict.ContainsKey("const"))
	{
	// Newer glTF 2.0 schema (as of September 2021) uses "const" for enums.
	var enumValue = dict["const"];
	if (this.Type?[0].Name == "integer")
	{
	this.Enum.Add(Convert.ToInt32(enumValue));
	this.EnumNames.Add(dict["description"].ToString());
	}
	else if (this.Type?[0].Name == "string")
	{
	this.Enum.Add(Convert.ToString(enumValue));
	}
	else
	{
	throw new NotImplementedException("Enum of " + this.Type?[0].Name);
	}
	}
	else if (dict.ContainsKey("enum"))
	{
	// Older glTF schemas use the enum keyword.
	JArray enumList = dict["enum"] as JArray;
	if (this.Type?[0].Name == "integer")
	{
	this.Enum.Add(enumList[0].ToObject<int>());
	this.EnumNames.Add(dict["description"].ToString());
	}
	else if (this.Type?[0].Name == "string")
	{
	this.Enum.Add(enumList[0].ToObject<string>());
	}
	else
	{
	throw new NotImplementedException("Enum of " + this.Type?[0].Name);
	}
	}
	}
	}

The code needs to somehow allow additional enum values or maybe use a string directly since valid values can be extended by a glTF extensions like KHR_animation_pointer.