private void ExportCollada_MaterialEffectTexture(XmlWriter xml, Kn5Material.TextureMapping tex) {
xml.WriteStartElement("texture");
xml.WriteAttributeStringSafe("texture", $"{tex.Texture}-image");
xml.WriteAttributeString("texcoord", "CHANNEL0");
xml.WriteStartElement("extra");
xml.WriteStartElement("technique");
xml.WriteAttributeString("profile", "MAYA");
xml.WriteStartElement("wrapV");
xml.WriteAttributeString("sid", "wrapV0");
xml.WriteString("TRUE");
xml.WriteEndElement();
xml.WriteStartElement("wrapU");
xml.WriteAttributeString("sid", "wrapU0");
xml.WriteString("TRUE");
xml.WriteEndElement();
xml.WriteStartElement("blend_mode");
xml.WriteString("ADD");
xml.WriteEndElement();
xml.WriteEndElement();
xml.WriteEndElement();
xml.WriteEndElement();
}