/// <summary>
/// Returns the C# value from USD or null if there was no value or the value could not be converted.
/// </summary>
object GetCSharpValue(UsdAttribute attr, UsdTimeCode time)
{
UsdTypeBinding binding;
if (!UsdIo.Bindings.GetReverseBinding(attr.GetTypeName(), out binding))
{
// No binding for this type.
return(null);
}
return(binding.toCsObject(attr.Get(time)));
}
/// <summary>
/// Serializes the attribute value to USD-ASCII and writes it to Debug.Log.
/// </summary>
void DebugPrintAttr(Scene srcScene, UsdAttribute attr, UsdTimeCode time)
{
// Copy the desired attribute into a temp scene, with nothing other than this one attr.
var tmpScene = Scene.Create();
// Up-Axis is unrelated to the attribute, but it makes the generated USDA look more correct,
// since it will include an up-axis.
tmpScene.UpAxis = srcScene.UpAxis;
// Define the owning prim for the attribute.
var tmpPrim = tmpScene.Stage.DefinePrim(attr.GetPath().GetPrimPath(), attr.GetPrim().GetTypeName());
// Define the attribute itself.
var tmpAttr = tmpPrim.CreateAttribute(attr.GetName(), attr.GetTypeName());
// Gather the default value and the value at the current time.
var defaultVal = attr.Get(UsdTimeCode.Default());
var valAtTime = attr.Get(time);
// Copy them to the new attribute.
if (!defaultVal.IsEmpty())
{
tmpAttr.Set(defaultVal);
}
if (attr.ValueMightBeTimeVarying())
{
tmpAttr.Set(valAtTime, time);
}
// If this is an array, get the size.
var arraySize = -1;
if (valAtTime.IsArrayValued())
{
arraySize = (int)valAtTime.GetArraySize();
}
// Metadata cannot be time-varying.
UsdMetadataValueMap metaData = attr.GetAllMetadata();
foreach (var key in metaData.GetKeys())
{
tmpAttr.SetMetadata(key, metaData.GetValue(key));
}
// Export the single attribute to a string.
var stringified = "";
tmpScene.Stage.ExportToString(out stringified, addSourceFileComment: false);
// Dispose the tmp scene.
tmpScene.Close();
tmpScene = null;
// Print.
if (arraySize > -1)
{
stringified = "Array Size: " + arraySize + "\n" + stringified;
}
Debug.Log("Path: <" + attr.GetPath().ToString() + ">\n" + stringified);
}