public static GLTFMaterial Deserialize(GLTFRoot root, JsonReader reader)
        {
            var material = new GLTFMaterial();

            while (reader.Read() && reader.TokenType == JsonToken.PropertyName)
            {
                var curProp = reader.Value.ToString();

                switch (curProp)
                {
                case "pbrMetallicRoughness":
                    material.PbrMetallicRoughness = GLTFPBRMetallicRoughness.Deserialize(root, reader);
                    break;

                case "normalTexture":
                    material.NormalTexture = GLTFNormalTextureInfo.Deserialize(root, reader);
                    break;

                case "occlusionTexture":
                    material.OcclusionTexture = GLTFOcclusionTextureInfo.Deserialize(root, reader);
                    break;

                case "emissiveTexture":
                    material.EmissiveTexture = GLTFTextureInfo.Deserialize(root, reader);
                    break;

                case "emissiveFactor":
                    material.EmissiveFactor = reader.ReadAsRGBColor();
                    break;

                case "alphaMode":
                    material.AlphaMode = reader.ReadStringEnum <GLTFAlphaMode>();
                    break;

                case "alphaCutoff":
                    material.AlphaCutoff = reader.ReadAsDouble().Value;
                    break;

                case "doubleSided":
                    material.DoubleSided = reader.ReadAsBoolean().Value;
                    break;

                default:
                    material.DefaultPropertyDeserializer(root, reader);
                    break;
                }
            }

            return(material);
        }
        public static GLTFPBRMetallicRoughness Deserialize(GLTFRoot root, JsonReader reader)
        {
            var metallicRoughness = new GLTFPBRMetallicRoughness();

            if (reader.Read() && reader.TokenType != JsonToken.StartObject)
            {
                throw new Exception("Asset must be an object.");
            }

            while (reader.Read() && reader.TokenType == JsonToken.PropertyName)
            {
                var curProp = reader.Value.ToString();

                switch (curProp)
                {
                case "baseColorFactor":
                    metallicRoughness.BaseColorFactor = reader.ReadAsRGBAColor();
                    break;

                case "baseColorTexture":
                    metallicRoughness.BaseColorTexture = GLTFTextureInfo.Deserialize(root, reader);
                    break;

                case "metallicFactor":
                    metallicRoughness.MetallicFactor = reader.ReadAsDouble().Value;
                    break;

                case "roughnessFactor":
                    metallicRoughness.RoughnessFactor = reader.ReadAsDouble().Value;
                    break;

                case "metallicRoughnessTexture":
                    metallicRoughness.MetallicRoughnessTexture = GLTFTextureInfo.Deserialize(root, reader);
                    break;

                default:
                    metallicRoughness.DefaultPropertyDeserializer(root, reader);
                    break;
                }
            }

            return(metallicRoughness);
        }