/// <summary>
/// A convenience method for converting a USD token into C# interpolation enum
/// </summary>
public void SetInterpolationToken(pxr.TfToken token)
{
if (token == pxr.UsdGeomTokens.constant)
{
interpolation = PrimvarInterpolation.Constant;
return;
}
else if (token == pxr.UsdGeomTokens.faceVarying)
{
interpolation = PrimvarInterpolation.FaceVarying;
return;
}
else if (token == pxr.UsdGeomTokens.uniform)
{
interpolation = PrimvarInterpolation.Uniform;
return;
}
else if (token == pxr.UsdGeomTokens.varying)
{
interpolation = PrimvarInterpolation.Varying;
return;
}
else if (token == pxr.UsdGeomTokens.vertex)
{
interpolation = PrimvarInterpolation.Vertex;
return;
}
else
{
throw new Exception("Unknown primvar interpolation token");
}
}
/// <summary>
/// Internal helper function to access the token cache.
/// </summary>
/// <param name="ns">The namespace prefix for the token, may be null.</param>
/// <param name="token">The string to tokenize, may be null.</param>
/// <returns>A TfToken holding the namespaced token string.</returns>
/// <example>GetCache("foo:bar", "baz") returns TfToken("foo:bar:baz")</example>
private pxr.TfToken GetCache(string ns, string token)
{
if (ns == null)
{
ns = string.Empty;
}
if (token == null)
{
token = string.Empty;
}
pxr.TfToken val;
lock (this) {
// TODO: the lock and nested lookup here could be more efficient.
// First lookup the namespace cache.
Dictionary <string, pxr.TfToken> nsCache;
if (!m_cache.TryGetValue(ns, out nsCache))
{
nsCache = new Dictionary <string, pxr.TfToken>();
m_cache[ns] = nsCache;
}
// Then lookup the token in the namespace.
if (!nsCache.TryGetValue(token, out val))
{
val = new pxr.TfToken(IntrinsicTypeConverter.JoinNamespace(ns, token));
nsCache[token] = val;
}
}
return(val);
}
SkeletonSample ReadUsdSkeleton(Scene scene, out string skelRootPath)
{
skelRootPath = null;
if (scene == null)
{
return(null);
}
try
{
var path = new pxr.SdfPath(m_usdMeshPath);
var absRoot = pxr.SdfPath.AbsoluteRootPath();
var skelRelName = new pxr.TfToken("skel:skeleton");
while (path != absRoot)
{
var prim = scene.GetPrimAtPath(path);
path = path.GetParentPath();
if (prim.HasRelationship(skelRelName))
{
var targets = prim.GetRelationship(skelRelName).GetForwardedTargets();
if (targets.Count == 0)
{
Debug.LogWarning("skel:skeleton has no targets at path: " + prim.GetPath());
continue;
}
var skelTarget = scene.GetPrimAtPath(targets[0]);
if (skelTarget == null)
{
Debug.LogWarning("prim <" + prim.GetPath() +
"> has skel:skeleton with missing target path: " + targets[0]);
continue;
}
skelRootPath = skelTarget.GetPath().ToString();
var sample = new SkeletonSample();
scene.Read(skelTarget.GetPath(), sample);
return(sample);
}
}
Debug.LogWarning("Skeleton not found for path: " + m_usdMeshPath);
return(null);
}
catch (System.Exception ex)
{
Debug.LogException(ex);
return(null);
}
}
/// Authors USD Shader inputs onto the given shader and material and connects private shader
/// inputs to the public material inputs (the intent being, inputs are authored on the material
/// and flow into the shader, which is a detail of the network).
static void CreateShaderInputs <T>(pxr.UsdShadeShader shader,
pxr.UsdShadeMaterial material,
Dictionary <string, T> paramDict)
{
USD.NET.UsdTypeBinding binding;
if (!USD.NET.UsdIo.Bindings.GetBinding(typeof(T), out binding))
{
// TODO: add "with exception" to GetBinding().
throw new Exception("Type not found: " + typeof(T).Name);
}
foreach (var kvp in paramDict)
{
var inputName = new pxr.TfToken(kvp.Key);
var matInput = material.CreateInput(inputName, binding.sdfTypeName);
var shaderInput = shader.CreateInput(inputName, binding.sdfTypeName);
matInput.Set(binding.toVtValue(kvp.Value));
shaderInput.Set(binding.toVtValue(kvp.Value));
shaderInput.ConnectToSource(matInput);
}
}
public PrimvarReaderSample()
{
if (typeof(T) == typeof(float))
{
id = new pxr.TfToken("UsdPrimvarReader_float");
}
else if (typeof(T) == typeof(Vector2))
{
id = new pxr.TfToken("UsdPrimvarReader_float2");
}
else if (typeof(T) == typeof(Vector3))
{
id = new pxr.TfToken("UsdPrimvarReader_float3");
}
else if (typeof(T) == typeof(Vector4))
{
id = new pxr.TfToken("UsdPrimvarReader_float4");
}
else if (typeof(T) == typeof(int))
{
id = new pxr.TfToken("UsdPrimvarReader_int");
}
else if (typeof(T) == typeof(string))
{
id = new pxr.TfToken("UsdPrimvarReader_string");
// TODO(jcowles): the "normal" type aliases to Vector3 in Unity.
//} else if (typeof(T) == typeof(Vector3)) {
// id = new pxr.TfToken("UsdPrimvarReader_normal");
}
else if (typeof(T) == typeof(Matrix4x4))
{
id = new pxr.TfToken("UsdPrimvarReader_matrix");
}
else
{
throw new System.ArgumentException("Invalid template type: " + typeof(T).Name);
}
}
/// <summary>
/// Writes SerializedProperty to USD, traversing all nested properties.
/// </summary>
static void PropertyToUsd(string path,
string propPrefix,
Scene scene,
SerializedProperty prop,
System.Text.StringBuilder sb)
{
string prefix = "";
try
{
var nameStack = new List <string>();
nameStack.Add("unity");
if (!string.IsNullOrEmpty(propPrefix))
{
nameStack.Add(propPrefix);
}
string lastName = "";
int lastDepth = 0;
while (prop.Next(prop.propertyType == SerializedPropertyType.Generic && !prop.isArray))
{
string tabIn = "";
for (int i = 0; i < prop.depth; i++)
{
tabIn += " ";
}
if (prop.depth > lastDepth)
{
Debug.Assert(lastName != "");
nameStack.Add(lastName);
}
else if (prop.depth < lastDepth)
{
nameStack.RemoveRange(nameStack.Count - (lastDepth - prop.depth), lastDepth - prop.depth);
}
lastDepth = prop.depth;
lastName = prop.name;
if (nameStack.Count > 0)
{
prefix = string.Join(":", nameStack.ToArray());
prefix += ":";
}
else
{
prefix = "";
}
sb.Append(tabIn + prefix + prop.name + "[" + prop.propertyType.ToString() + "] = ");
if (prop.isArray && prop.propertyType != SerializedPropertyType.String)
{
// TODO.
sb.AppendLine("ARRAY");
}
else if (prop.propertyType == SerializedPropertyType.Generic)
{
sb.AppendLine("Generic");
}
else if (prop.propertyType == SerializedPropertyType.AnimationCurve ||
prop.propertyType == SerializedPropertyType.Gradient)
{
// TODO.
sb.AppendLine(NativeSerialization.ValueToString(prop));
}
else
{
sb.AppendLine(NativeSerialization.ValueToString(prop));
var vtValue = NativeSerialization.PropToVtValue(prop);
var primPath = new pxr.SdfPath(path);
var attrName = new pxr.TfToken(prefix + prop.name);
/*
* var oldPrim = context.prevScene.Stage.GetPrimAtPath(primPath);
* pxr.VtValue oldVtValue = null;
* if (oldPrim.IsValid()) {
* var oldAttr = oldPrim.GetAttribute(attrName);
* if (oldAttr.IsValid()) {
* oldVtValue = oldAttr.Get(0);
* }
* }
*
* if (oldVtValue != null && vtValue == oldVtValue) {
* Debug.Log("skipping: " + prop.name);
* continue;
* }
*/
var sdfType = NativeSerialization.GetSdfType(prop);
var prim = scene.GetPrimAtPath(primPath);
var attr = prim.CreateAttribute(attrName, sdfType);
attr.Set(vtValue);
}
}
}
catch
{
Debug.LogWarning("Failed on: " + path + "." + prefix + prop.name);
throw;
}
}
public PreviewSurfaceSample()
{
id = new pxr.TfToken("UsdPreviewSurface");
}
public StandardShaderSample()
{
id = new pxr.TfToken("Unity.Standard");
}
public TextureReaderSample() : base()
{
id = new pxr.TfToken("UsdUVTexture");
}
/// <summary>
/// Internal helper for reading data from USD.
/// </summary>
/// <param name="attrName">The USD attribute name.</param>
/// <param name="csType">The C# type.</param>
/// <param name="csValue">The C# value to populate.</param>
/// <param name="usdTime">The time at which to sample key frames.</param>
/// <param name="prim">The USD prim from which to read data.</param>
/// <param name="memberInfo">The field/property providing serialization metadata.</param>
/// <param name="usdNamespace">The optional USD namespace at which values live.</param>
/// <param name="accessMap">A map of members to include when reading.</param>
/// <param name="mayVary">When not null, is populated with variability.</param>
/// <returns>True on success.</returns>
/// <remarks>
/// Note that "success" in the return value does not indicate data was read, rather it
/// indicates that no unexpected states were encountered. E.g. calling ReadAttr on a field
/// with no value stored in USD will not return false, since that is not considered a failure
/// state.
/// </remarks>
bool ReadAttr(string attrName, Type csType, ref object csValue, pxr.UsdTimeCode usdTime,
pxr.UsdPrim prim, MemberInfo memberInfo,
HashSet <MemberInfo> accessMap, ref bool?mayVary,
string usdNamespace)
{
bool isNewPrimvar = csValue != null &&
csType.IsGenericType &&
csType.GetGenericTypeDefinition() == typeof(Primvar <>);
bool isPrimvar = Reflect.IsPrimvar(memberInfo) || isNewPrimvar;
string ns = IntrinsicTypeConverter.JoinNamespace(usdNamespace,
Reflect.GetNamespace(memberInfo));
// ----------------------------------------- //
// Dictionaries, read, early exit, recurse.
// ----------------------------------------- //
// If holding a dictionary, immediately recurse and write keys as attributes.
if (csValue != null &&
csType.IsGenericType &&
csType.GetGenericTypeDefinition() == typeof(Dictionary <,>) &&
csType.GetGenericArguments()[0] == typeof(string))
{
Type genericTypeDef = csType.GetGenericArguments()[1].IsGenericType
? csType.GetGenericArguments()[1].GetGenericTypeDefinition()
: null;
isNewPrimvar = genericTypeDef == typeof(Primvar <>);
bool isRelationship = csType.GetGenericArguments()[1] == typeof(Relationship);
bool isConnection = genericTypeDef == typeof(Connectable <>);
// String dictionaries are unrolled directly into the object.
// So the namespace is either the incoming namespace or empty, meaning each string value in
// the dictionary becomes an attribute on the prim.
// Ensure there is always a namespace immediately around this member.
if (string.IsNullOrEmpty(Reflect.GetNamespace(memberInfo)))
{
ns = IntrinsicTypeConverter.JoinNamespace(ns, attrName);
usdNamespace = IntrinsicTypeConverter.JoinNamespace(usdNamespace, attrName);
}
// Unfortunately, the primvars prefixing logic must be replicated here so we can discover
// the dictionary member from USD.
if (isPrimvar || isNewPrimvar)
{
ns = IntrinsicTypeConverter.JoinNamespace("primvars", ns);
}
var dict = csValue as System.Collections.IDictionary;
ConstructorInfo ctor = (isNewPrimvar || isConnection || isRelationship)
? csType.GetGenericArguments()[1].GetConstructor(new Type[0])
: null;
dict.Clear();
foreach (var prop in prim.GetAuthoredPropertiesInNamespace(ns))
{
object value = null;
if (ctor != null)
{
value = ctor.Invoke(new object[0]);
}
// The recursive call will also discover that this is a primvar and any associated namespace.
if (ReadAttr(prop.GetBaseName(),
csType.GetGenericArguments()[1],
ref value,
usdTime,
prim,
memberInfo,
accessMap,
ref mayVary,
usdNamespace))
{
if (value != null)
{
dict.Add(prop.GetBaseName().ToString(), value);
}
}
}
return(true);
}
pxr.TfToken sdfAttrName = sm_tokenCache[ns, attrName];
// ----------------------------------------- //
// Relationship, read + early exit.
// ----------------------------------------- //
if (csType == typeof(Relationship))
{
// mayVary is explicitly not set here because it has accumulation semantics:
// mayVary = mayVary || false;
// Which is equivalent to the no-op:
// mayVary = mayVary;
pxr.UsdRelationship rel = null;
lock (m_stageLock) {
rel = prim.GetRelationship(sm_tokenCache[sdfAttrName]);
}
var relationship = new Relationship();
csValue = relationship;
if (rel == null || !rel.IsValid())
{
return(true);
}
pxr.SdfPathVector paths = rel.GetTargets();
string[] result = new string[paths.Count];
for (int i = 0; i < paths.Count; i++)
{
result[i] = paths[i].ToString();
}
relationship.targetPaths = result;
return(true);
}
// ----------------------------------------- //
// Connection Setup.
// ----------------------------------------- //
Connectable conn = null;
if (csValue != null &&
csType.IsGenericType &&
csType.GetGenericTypeDefinition() == typeof(Connectable <>))
{
conn = csValue as Connectable;
if (conn != null)
{
// Since this is a Connectable<T>, the held value T is what's being read from USD,
// so replace csValue with the held T value itself. csValue must be restored before
// returning.
csValue = conn.GetValue();
// Same treatment for the type.
csType = conn.GetValueType();
}
}
// ----------------------------------------- //
// Primvar Setup.
// ----------------------------------------- //
ValueAccessor pvAccessor = null;
PrimvarBase pvBase = null;
if (isNewPrimvar)
{
pvAccessor = csValue as ValueAccessor;
pvBase = (PrimvarBase)csValue;
// Since this is a Primvar<T>, the held value T is what's being read from USD,
// so replace csVAlue with the held T value itself. csValue must be restored before
// returning.
csValue = pvAccessor.GetValue();
// Same treatment for the type.
csType = pvAccessor.GetValueType();
}
// ----------------------------------------- //
// Lookup Type Conversion Delegate.
// ----------------------------------------- //
UsdTypeBinding binding;
if (!sm_bindings.GetBinding(csType, out binding) &&
!csType.IsEnum &&
csType != typeof(object))
{
if (string.IsNullOrEmpty(ns))
{
return(false);
}
var sample = csValue as SampleBase;
if (csValue == null)
{
// This could attempt to automatically constuct the needed object, then nullable objects
// could be used instead to drive deserialization.
return(false);
}
else if (sample == null)
{
// In this case, csValue is not null, but also cannot be converted to SampleBase.
throw new ArgumentException("Type does not inherit from SampleBase: " + attrName);
}
Deserialize((SampleBase)csValue, prim, usdTime, accessMap, ref mayVary, usdNamespace: ns);
return(true);
}
// ----------------------------------------- //
// Prep to Read.
// ----------------------------------------- //
// Restore C# value to the actual property value.
if (conn != null)
{
csValue = conn;
}
else if (pvAccessor != null)
{
csValue = pvAccessor;
}
// Append "primvars:" namespace to primvars.
if (isPrimvar)
{
var joinedName = IntrinsicTypeConverter.JoinNamespace(ns, attrName);
sdfAttrName = sm_tokenCache["primvars", joinedName];
}
// Adjust time for variability.
pxr.SdfVariability variability = Reflect.GetVariability(memberInfo);
pxr.UsdTimeCode time = variability == pxr.SdfVariability.SdfVariabilityUniform
? kDefaultUsdTime
: usdTime;
// Allocate a temp VtValue.
pxr.VtValue vtValue = (pxr.VtValue)ArrayAllocator.MallocHandle(typeof(pxr.VtValue));
try {
// ----------------------------------------- //
// Read Connected Paths.
// ----------------------------------------- //
if (conn != null)
{
// Connection paths cannot be animated, so mayVary is not affected.
var sources = new pxr.SdfPathVector();
if (prim.GetAttribute(sdfAttrName).GetConnections(sources))
{
if (sources.Count > 0)
{
conn.SetConnectedPath(sources[0].ToString());
}
}
}
// ----------------------------------------- //
// Read Associated Primvar Data.
// ----------------------------------------- //
// If this is a Primvar<T>, read the associated primvar metadata and indices.
if (pvBase != null)
{
var attr = prim.GetAttribute(sdfAttrName);
if (attr)
{
var pv = new pxr.UsdGeomPrimvar(attr);
// ElementSize and Interpolation are not animatable, so they do not affect mayVary.
pvBase.elementSize = pv.GetElementSize();
pvBase.SetInterpolationToken(pv.GetInterpolation());
// Indices are a first class attribute and may vary over time.
var indices = pv.GetIndicesAttr();
if (indices)
{
if (accessMap != null)
{
if (indices.GetVariability() == pxr.SdfVariability.SdfVariabilityVarying ||
indices.ValueMightBeTimeVarying())
{
accessMap.Add(memberInfo);
mayVary |= true;
}
}
indices.Get(vtValue, time);
if (!vtValue.IsEmpty())
{
var vtIntArray = pxr.UsdCs.VtValueToVtIntArray(vtValue);
pvBase.indices = IntrinsicTypeConverter.FromVtArray(vtIntArray);
}
}
}
}
// ----------------------------------------- //
// Read the value of csValue.
// ----------------------------------------- //
if (Reflect.IsMetadata(memberInfo))
{
vtValue = prim.GetMetadata(sdfAttrName);
// Metadata cannot vary over time.
}
else if (Reflect.IsCustomData(memberInfo))
{
vtValue = prim.GetCustomDataByKey(sdfAttrName);
// Custom data is metadata, which cannot vary over time.
}
else if (Reflect.IsFusedDisplayColor(memberInfo))
{
vtValue = pxr.UsdCs.GetFusedDisplayColor(prim, time);
if (accessMap != null)
{
// Display color is actually two attributes, primvars:displayColor and
// primvars:displayOpacity.
var gprim = new pxr.UsdGeomGprim(prim);
if (gprim && gprim.GetDisplayColorAttr().ValueMightBeTimeVarying())
{
accessMap.Add(memberInfo);
mayVary |= true;
}
}
}
else if (Reflect.IsFusedTransform(memberInfo))
{
vtValue = pxr.UsdCs.GetFusedTransform(prim, time);
if (accessMap != null)
{
// Transforms are complicated :/
var xformable = new pxr.UsdGeomXformable(prim);
if (xformable)
{
bool dummy;
var orderAttr = xformable.GetXformOpOrderAttr();
if (orderAttr)
{
if (orderAttr.GetVariability() == pxr.SdfVariability.SdfVariabilityVarying &&
orderAttr.ValueMightBeTimeVarying())
{
mayVary |= true;
accessMap.Add(memberInfo);
}
else
{
foreach (var op in xformable.GetOrderedXformOps(out dummy))
{
var opAttr = op.GetAttr();
if (!opAttr)
{
continue;
}
if (opAttr.GetVariability() == pxr.SdfVariability.SdfVariabilityVarying &&
opAttr.ValueMightBeTimeVarying())
{
mayVary |= true;
accessMap.Add(memberInfo);
break;
}
} // foreach
}
} // orderAttr
} // xformable
} // mayVary
}
else
{
if (accessMap != null)
{
var attr = prim.GetAttribute(sdfAttrName);
if (attr.GetVariability() == pxr.SdfVariability.SdfVariabilityVarying &&
attr.ValueMightBeTimeVarying())
{
accessMap.Add(memberInfo);
mayVary |= true;
}
}
if (!prim.GetAttributeValue(sdfAttrName, vtValue, time))
{
// Object has no value, still considered success.
return(true);
}
}
if (vtValue.IsEmpty())
{
// Object has no value, still considered success.
return(true);
}
// ------------------------------------------ //
// Infer C# type from USD when Type == Object
// ------------------------------------------ //
if (csType == typeof(object))
{
// Blind object serialization needs special handling, since we won't know the C# type a priori.
// Instead, do a reverse lookup on the SdfTypeName and let USD dictate the C# type.
pxr.UsdAttribute attr = prim.GetAttribute(sdfAttrName);
if (attr != null && attr.IsValid())
{
// TODO: Assuming the reverse lookup is successful for the binding, the caller may be
// surprised by the result, since the USD <-> C# types are not 1-to-1. For example,
// a List<Vector2> may have been serialized, but Vector2[] may be read.
if (!sm_bindings.GetReverseBinding(attr.GetTypeName(), out binding))
{
if (string.IsNullOrEmpty(ns))
{
return(false);
}
// TODO: readback nested object declared as object -- maybe just disable this?
//Deserialize(ref csValue, prim, usdTime, usdNamespace: ns);
//return true;
return(false);
}
}
else
{
// TODO: Allow reading metadata declared as object in C#
return(false);
}
}
// ------------------------------------------ //
// Convert USD's VtValue -> Strong C# Type.
// ------------------------------------------ //
csValue = binding.toCsObject(vtValue);
// ------------------------------------------ //
// Restore csValue.
// ------------------------------------------ //
if (conn != null && csValue != null)
{
conn.SetValue(csValue);
csValue = conn;
}
if (pvAccessor != null)
{
pvAccessor.SetValue(csValue);
csValue = pvAccessor;
}
} finally {
// Would prefer RAII handle, but introduces garbage.
ArrayAllocator.FreeHandle(vtValue);
}
return(true);
}
/// <summary>
/// Internal helper for serializing data to USD.
/// </summary>
/// <param name="attrName">The USD attribute name.</param>
/// <param name="csType">The C# type.</param>
/// <param name="csValue">The C# value.</param>
/// <param name="usdTime">The time at which to sample key frames.</param>
/// <param name="prim">The USD prim at which to write values.</param>
/// <param name="imgble">The UsdGeomImagable attrbiute, used when writing PrimVars.</param>
/// <param name="memberInfo">The field/property providing serialization metadata.</param>
/// <param name="usdNamespace">The optional USD namespace at which values live.</param>
/// <param name="srcObject">The source object name, used when remapping names.</param>
/// <returns>True on success.</returns>
/// <remarks>
/// Note that "success" in the return value does not indicate data was written, rather it
/// indicates that no unexpected states were encountered. E.g. calling WriteAttr on a field
/// marked as [NotSerialized] does not cause this method to return false, since non-serialized
/// fields are an expected state this function may encounter.
/// </remarks>
bool WriteAttr(string attrName, Type csType, object csValue, pxr.UsdTimeCode usdTime,
pxr.UsdPrim prim, pxr.UsdGeomImageable imgble, MemberInfo memberInfo,
string usdNamespace, string srcObject = null)
{
if (Reflect.IsNonSerialized(memberInfo))
{
Console.WriteLine("Non serialized");
return(true);
}
// If serializing a Primvar<T>, extract the held value and save it in csValue, allowing the
// all downstream logic to act as if it's operating on the held value itself.
PrimvarBase pvBase = null;
if (csType.IsGenericType && csType.GetGenericTypeDefinition() == typeof(Primvar <>))
{
if (csValue == null)
{
// Object not written, still considered success.
return(true);
}
pvBase = (PrimvarBase)csValue;
csValue = (csValue as ValueAccessor).GetValue();
if (csValue == null)
{
// Object not written, still considered success.
return(true);
}
csType = csValue.GetType();
}
bool isCustomData = Reflect.IsCustomData(memberInfo);
bool isMetaData = Reflect.IsMetadata(memberInfo);
bool isPrimvar = Reflect.IsPrimvar(memberInfo);
bool isNewPrimvar = pvBase != null;
int primvarElementSize = Reflect.GetPrimvarElementSize(memberInfo);
string ns = IntrinsicTypeConverter.JoinNamespace(usdNamespace,
Reflect.GetNamespace(memberInfo));
// If holding a dictionary, immediately recurse and write keys as attributes.
if (csValue != null &&
csType.IsGenericType &&
csType.GetGenericTypeDefinition() == typeof(Dictionary <,>) &&
csType.GetGenericArguments()[0] == typeof(string))
{
isNewPrimvar = csType.GetGenericArguments()[1].IsGenericType &&
csType.GetGenericArguments()[1].GetGenericTypeDefinition() == typeof(Primvar <>);
// Ensure the immediate dictionary member is always namespaced.
if (string.IsNullOrEmpty(Reflect.GetNamespace(memberInfo)))
{
usdNamespace = IntrinsicTypeConverter.JoinNamespace(usdNamespace, attrName);
}
var dict = csValue as System.Collections.IDictionary;
foreach (System.Collections.DictionaryEntry kvp in dict)
{
object value = kvp.Value;
WriteAttr((string)kvp.Key, value.GetType(), value,
usdTime, prim, imgble, memberInfo, usdNamespace, srcObject: attrName);
}
return(true);
}
pxr.TfToken sdfAttrName = sm_tokenCache[attrName];
if (csType == typeof(Relationship) && csValue != null)
{
string[] targetStrings = ((Relationship)csValue).targetPaths;
if (targetStrings != null)
{
//
// Write Relationship
//
string[] arr = IntrinsicTypeConverter.JoinNamespace(ns, sdfAttrName).Split(':');
pxr.StdStringVector elts = new pxr.StdStringVector(arr.Length);
foreach (var s in arr)
{
elts.Add(s);
}
pxr.UsdRelationship rel = null;
lock (m_stageLock) {
rel = prim.CreateRelationship(elts, custom: false);
}
if (!rel.IsValid())
{
throw new ApplicationException("Failed to create relationship <"
+ prim.GetPath().AppendProperty(
new pxr.TfToken(
IntrinsicTypeConverter.JoinNamespace(ns, sdfAttrName))).ToString() + ">");
}
var targets = new pxr.SdfPathVector();
foreach (var path in ((Relationship)csValue).targetPaths)
{
targets.Add(new pxr.SdfPath(path));
}
lock (m_stageLock) {
rel.SetTargets(targets);
}
}
return(true);
}
//
// Write Attribute
//
// FUTURE: When writing sparse overrides, if the csValue is null exit here and avoid
// defining the target attribute. However, sparse authoring is not yet supported.
UsdTypeBinding binding;
// Extract the value and type from the connectable.
var conn = csValue as Connectable;
if (conn != null)
{
csType = conn.GetValueType();
csValue = conn.GetValue();
}
// Get the binding for the value about to be serialized.
if (!sm_bindings.GetBinding(csType, out binding) && !csType.IsEnum)
{
if (csValue == null)
{
return(true);
}
if (string.IsNullOrEmpty(ns))
{
return(false);
}
var sample = csValue as SampleBase;
if (sample == null && csValue != null)
{
throw new ArgumentException("Type does not inherit from SampleBase: " + attrName);
}
Serialize(csValue, prim, usdTime, usdNamespace: ns);
return(true);
}
// Determine metadata for the attribtue, note that in the case of connections and primvars
// these will be the attributes on the outter object, e.g. declared on the Connection<T> or
// Primvar<T>.
pxr.SdfVariability variability = Reflect.GetVariability(memberInfo);
pxr.SdfValueTypeName sdfTypeName = binding.sdfTypeName;
pxr.UsdTimeCode time = variability == pxr.SdfVariability.SdfVariabilityUniform
? pxr.UsdTimeCode.Default()
: usdTime;
bool custom = false;
pxr.UsdAttribute attr;
if (isCustomData || isMetaData)
{
// no-op
attr = null;
}
else if (!isPrimvar && !isNewPrimvar)
{
if (string.IsNullOrEmpty(ns))
{
//
// Create non-namespaced attribute.
//
lock (m_stageLock) {
attr = prim.CreateAttribute(sdfAttrName, csType.IsEnum ? SdfValueTypeNames.Token : sdfTypeName, custom, variability);
}
}
else
{
//
// Create namespaced attribute.
//
string[] arr = IntrinsicTypeConverter.JoinNamespace(ns, sdfAttrName).Split(':');
pxr.StdStringVector elts = new pxr.StdStringVector(arr.Length);
foreach (var s in arr)
{
elts.Add(s);
}
lock (m_stageLock) {
attr = prim.CreateAttribute(elts, sdfTypeName, custom, variability);
}
}
}
else
{
//
// Create Primvar attribute.
//
lock (m_stageLock) {
var fullAttrName = IntrinsicTypeConverter.JoinNamespace(ns, sdfAttrName);
var primvar = imgble.CreatePrimvar(new pxr.TfToken(fullAttrName), sdfTypeName,
VertexDataAttribute.Interpolation);
if (isNewPrimvar)
{
primvar.SetElementSize(pvBase.elementSize);
if (pvBase.indices != null)
{
var vtIndices = IntrinsicTypeConverter.ToVtArray(pvBase.indices);
primvar.SetIndices(vtIndices, time);
}
primvar.SetInterpolation(pvBase.GetInterpolationToken());
}
else
{
primvar.SetElementSize(primvarElementSize);
}
attr = primvar.GetAttr();
}
}
if (attr != null && conn != null && conn.GetConnectedPath() != null)
{
// TODO: Pool temp vector, possibly add a single item overload for SetConnections.
var paths = new pxr.SdfPathVector();
var connPath = conn.GetConnectedPath();
if (connPath != string.Empty)
{
paths.Add(new pxr.SdfPath(conn.GetConnectedPath()));
}
attr.SetConnections(paths);
}
// This may happen when a connection is present, but has a null default value.
// Because the connection is applied just before this point, this is the earliest possible
// exit point.
if (csValue == null)
{
return(true);
}
pxr.VtValue vtValue = binding.toVtValue(csValue);
lock (m_stageLock) {
if (isMetaData)
{
prim.SetMetadata(sdfAttrName, vtValue);
}
else if (isCustomData)
{
prim.SetCustomDataByKey(sdfAttrName, vtValue);
}
else if (Reflect.IsFusedDisplayColor(memberInfo))
{
pxr.UsdCs.SetFusedDisplayColor(prim, vtValue, time);
}
else
{
attr.Set(vtValue, time);
}
}
if (!isCustomData && srcObject != null)
{
lock (m_stageLock) {
attr.SetCustomDataByKey(sm_tokenCache["sourceMember"], srcObject);
}
}
return(true);
}
/// <summary>
/// Constructs Unity SerializedProperties from USD.
/// </summary>
static void PropertyFromUsd(pxr.UsdPrim prim,
SerializedProperty prop,
System.Text.StringBuilder sb,
string propPrefix)
{
if (prim == null)
{
Debug.LogError("Null prim - " + propPrefix);
}
if (!prim.IsValid())
{
Debug.LogError("Invalid prim: " + prim.GetPath().ToString());
}
string prefix = "";
try
{
var nameStack = new List <string>();
nameStack.Add("unity");
if (!string.IsNullOrEmpty(propPrefix))
{
nameStack.Add(propPrefix);
}
string lastName = "";
int lastDepth = 0;
while (prop.Next(prop.propertyType == SerializedPropertyType.Generic && !prop.isArray))
{
string tabIn = "";
for (int i = 0; i < prop.depth; i++)
{
tabIn += " ";
}
if (prop.depth > lastDepth)
{
Debug.Assert(lastName != "");
nameStack.Add(lastName);
}
else if (prop.depth < lastDepth)
{
nameStack.RemoveRange(nameStack.Count - (lastDepth - prop.depth), lastDepth - prop.depth);
}
lastDepth = prop.depth;
lastName = prop.name;
if (nameStack.Count > 0)
{
prefix = string.Join(":", nameStack.ToArray());
prefix += ":";
}
else
{
prefix = "";
}
sb.Append(tabIn + prefix + prop.name + "[" + prop.propertyType.ToString() + "] = ");
if (prop.isArray && prop.propertyType != SerializedPropertyType.String)
{
// TODO.
sb.AppendLine("ARRAY");
}
else if (prop.propertyType == SerializedPropertyType.Generic)
{
sb.AppendLine("Generic");
}
else if (prop.propertyType == SerializedPropertyType.AnimationCurve ||
prop.propertyType == SerializedPropertyType.Gradient)
{
// TODO.
sb.AppendLine(NativeSerialization.ValueToString(prop));
}
else
{
sb.AppendLine(NativeSerialization.ValueToString(prop));
var attrName = new pxr.TfToken(prefix + prop.name);
var attr = prim.GetAttribute(attrName);
if (attr == null)
{
Debug.LogError("Null attr: " + prim.GetPath().ToString() + "." + attrName.ToString());
}
if (!attr.IsValid())
{
Debug.LogError("Attribute not found:" + attr.GetPath().ToString());
}
NativeSerialization.VtValueToProp(prop, attr.Get(0));
}
}
}
catch
{
Debug.LogWarning("Failed on: " + prim.GetPath() + "." + prefix + prop.name);
throw;
}
}
/// <summary>
/// Internal helper for reading data from USD.
/// </summary>
/// <param name="attrName">The USD attribute name.</param>
/// <param name="csType">The C# type.</param>
/// <param name="csValue">The C# value to populate.</param>
/// <param name="usdTime">The time at which to sample key frames.</param>
/// <param name="prim">The USD prim from which to read data.</param>
/// <param name="memberInfo">The field/property providing serialization metadata.</param>
/// <param name="usdNamespace">The optional USD namespace at which values live.</param>
/// <param name="srcObject">The source object name, used when remapping names.</param>
/// <returns>True on success.</returns>
/// <remarks>
/// Note that "success" in the return value does not indicate data was read, rather it
/// indicates that no unexpected states were encountered. E.g. calling ReadAttr on a field
/// with no value stored in USD will not return false, since that is not considered a failure
/// state.
/// </remarks>
bool ReadAttr(string attrName, Type csType, ref object csValue, pxr.UsdTimeCode usdTime,
pxr.UsdPrim prim, MemberInfo memberInfo,
string usdNamespace, string srcObject = null)
{
bool isPrimvar = Reflect.IsPrimvar(memberInfo);
string ns = IntrinsicTypeConverter.JoinNamespace(usdNamespace,
Reflect.GetNamespace(memberInfo));
// If holding a dictionary, immediately recurse and write keys as attributes.
if (csType == typeof(Dictionary <string, object>))
{
string sourceMember;
if (isPrimvar)
{
ns = "primvars";
sourceMember = attrName;
}
else
{
ns = IntrinsicTypeConverter.JoinNamespace(ns, attrName);
sourceMember = null;
}
var dict = csValue as Dictionary <string, object>;
foreach (var prop in prim.GetAuthoredPropertiesInNamespace(ns))
{
object value = null;
if (!string.IsNullOrEmpty(sourceMember))
{
pxr.VtValue valSrcMember = prop.GetCustomDataByKey(sm_tokenCache["sourceMember"]);
if (valSrcMember.IsEmpty() || sourceMember != (string)valSrcMember)
{
continue;
}
}
if (isPrimvar)
{
// The recursive call will also discover that this is a primvar.
ns = "";
}
if (ReadAttr(prop.GetBaseName(), typeof(Object), ref value, usdTime, prim, memberInfo, ns, srcObject))
{
if (value != null)
{
dict.Add(prop.GetBaseName(), value);
}
}
}
return(true);
}
pxr.TfToken sdfAttrName = sm_tokenCache[ns, attrName];
if (csType == typeof(Relationship))
{
//
// Read Relationship
//
pxr.UsdRelationship rel = null;
lock (m_stageLock) {
rel = prim.GetRelationship(sm_tokenCache[sdfAttrName]);
}
var relationship = new Relationship();
csValue = relationship;
if (rel == null || !rel.IsValid())
{
return(true);
}
pxr.SdfPathVector paths = rel.GetTargets();
string[] result = new string[paths.Count];
for (int i = 0; i < paths.Count; i++)
{
result[i] = paths[i].ToString();
}
relationship.targetPaths = result;
return(true);
}
UsdTypeBinding binding;
Connectable conn = null;
if (csValue != null &&
csType.IsGenericType &&
csType.GetGenericTypeDefinition() == typeof(Connectable <>))
{
conn = csValue as Connectable;
if (conn != null)
{
csValue = conn.GetValue();
csType = conn.GetValueType();
}
}
if (!sm_bindings.GetBinding(csType, out binding) &&
!csType.IsEnum &&
csType != typeof(object))
{
if (string.IsNullOrEmpty(ns))
{
return(false);
}
var sample = csValue as SampleBase;
if (sample == null)
{
throw new Exception("Could not deserialize: Prim: " + prim.GetPath() + " namespace: " + ns);
}
Deserialize((SampleBase)csValue, prim, usdTime, usdNamespace: ns);
return(true);
}
if (conn != null)
{
csValue = conn;
}
pxr.SdfVariability variability = Reflect.GetVariability(memberInfo);
// Note that namespaced primvars are not supported, so "primvars" will replace the incoming
// namespace. This will happen if a nested/namespaced object has a member declared as a
// primvar.
if (isPrimvar)
{
System.Diagnostics.Debug.Assert(string.IsNullOrEmpty(ns));
sdfAttrName = sm_tokenCache["primvars", attrName];
}
pxr.UsdTimeCode time = variability == pxr.SdfVariability.SdfVariabilityUniform
? kDefaultUsdTime
: usdTime;
//using (var valWrapper = new PooledHandle<pxr.VtValue>(ArrayAllocator)) {
pxr.VtValue vtValue = (pxr.VtValue)ArrayAllocator.MallocHandle(typeof(pxr.VtValue));
try {
if (conn != null)
{
var sources = new pxr.SdfPathVector();
if (prim.GetAttribute(sdfAttrName).GetConnections(sources))
{
if (sources.Count > 0)
{
conn.SetConnectedPath(sources[0].ToString());
}
}
}
if (Reflect.IsCustomData(memberInfo))
{
vtValue = prim.GetCustomDataByKey(sdfAttrName);
}
else if (Reflect.IsFusedDisplayColor(memberInfo))
{
vtValue = pxr.UsdCs.GetFusedDisplayColor(prim, time);
}
else if (Reflect.IsFusedTransform(memberInfo))
{
vtValue = pxr.UsdCs.GetFusedTransform(prim, time);
}
else
{
if (!prim.GetAttributeValue(sdfAttrName, vtValue, time))
{
// Object has no value, still considered success.
return(true);
}
}
if (vtValue.IsEmpty())
{
// Object has no value, still considered success.
return(true);
}
if (csType == typeof(object))
{
// Blind object serialization needs special handling, since we won't know the C# type a priori.
// Instead, do a reverse lookup on the SdfTypeName and let USD dictate the C# type.
pxr.UsdAttribute attr = prim.GetAttribute(sdfAttrName);
if (attr != null && attr.IsValid())
{
// TODO: Assuming the reverse lookup is successful for the binding, the caller may be
// surprised by the result, since the USD <-> C# types are not 1-to-1. For example,
// a List<Vector2> may have been serialized, but Vector2[] may be read.
if (!sm_bindings.GetReverseBinding(attr.GetTypeName(), out binding))
{
if (string.IsNullOrEmpty(ns))
{
return(false);
}
// TODO: readback nested object declared as object -- maybe just disable this?
//Deserialize(ref csValue, prim, usdTime, usdNamespace: ns);
//return true;
return(false);
}
}
else
{
// TODO: Allow reading metadata declared as object in C#
return(false);
}
}
csValue = binding.toCsObject(vtValue);
if (conn != null && csValue != null)
{
conn.SetValue(csValue);
csValue = conn;
}
} finally {
// Would prefer RAII handle, but introduces garbage.
ArrayAllocator.FreeHandle(vtValue);
}
// Need to deal with this
//if (srcObject != null) {
// attr.SetCustomDataByKey(m_tokenCache["sourceMember"], srcObject);
//}
return(true);
}
/// <summary>
/// Internal helper for serializing data to USD.
/// </summary>
/// <param name="attrName">The USD attribute name.</param>
/// <param name="csType">The C# type.</param>
/// <param name="csValue">The C# value.</param>
/// <param name="usdTime">The time at which to sample key frames.</param>
/// <param name="prim">The USD prim at which to write values.</param>
/// <param name="imgble">The UsdGeomImagable attrbiute, used when writing PrimVars.</param>
/// <param name="memberInfo">The field/property providing serialization metadata.</param>
/// <param name="usdNamespace">The optional USD namespace at which values live.</param>
/// <param name="srcObject">The source object name, used when remapping names.</param>
/// <returns>True on success.</returns>
/// <remarks>
/// Note that "success" in the return value does not indicate data was written, rather it
/// indicates that no unexpected states were encountered. E.g. calling WriteAttr on a field
/// marked as [NotSerialized] does not cause this method to return false, since non-serialized
/// fields are an expected state this function may encounter.
/// </remarks>
bool WriteAttr(string attrName, Type csType, object csValue, pxr.UsdTimeCode usdTime,
pxr.UsdPrim prim, pxr.UsdGeomImageable imgble, MemberInfo memberInfo,
string usdNamespace, string srcObject = null)
{
if (Reflect.IsNonSerialized(memberInfo))
{
return(true);
}
// If holding a dictionary, immediately recurse and write keys as attributes.
if (csType == typeof(Dictionary <string, object>))
{
Dictionary <string, object> dict = csValue as Dictionary <string, object>;
foreach (var kvp in dict)
{
object value = kvp.Value;
WriteAttr(kvp.Key, value.GetType(), value,
usdTime, prim, imgble, memberInfo, usdNamespace, srcObject: attrName);
}
return(true);
}
string ns = IntrinsicTypeConverter.JoinNamespace(usdNamespace,
Reflect.GetNamespace(memberInfo));
pxr.TfToken sdfAttrName = sm_tokenCache[attrName];
if (csType == typeof(Relationship) && csValue != null)
{
string[] targetStrings = ((Relationship)csValue).targetPaths;
if (targetStrings != null)
{
//
// Write Relationship
//
string[] arr = IntrinsicTypeConverter.JoinNamespace(ns, sdfAttrName).Split(':');
pxr.StdStringVector elts = new pxr.StdStringVector(arr.Length);
foreach (var s in arr)
{
elts.Add(s);
}
pxr.UsdRelationship rel = null;
lock (m_stageLock) {
rel = prim.CreateRelationship(elts, custom: false);
}
if (!rel.IsValid())
{
throw new ApplicationException("Failed to create relationship <"
+ prim.GetPath().AppendProperty(
new pxr.TfToken(
IntrinsicTypeConverter.JoinNamespace(ns, sdfAttrName))).ToString() + ">");
}
var targets = new pxr.SdfPathVector();
foreach (var path in ((Relationship)csValue).targetPaths)
{
targets.Add(new pxr.SdfPath(path));
}
lock (m_stageLock) {
rel.SetTargets(targets);
}
}
return(true);
}
//
// Write Attribute
//
// Object not written, still considered success.
if (csValue == null)
{
return(true);
}
bool isCustomData = Reflect.IsCustomData(memberInfo);
bool isPrimvar = Reflect.IsPrimvar(memberInfo);
UsdTypeBinding binding;
var conn = csValue as Connectable;
if (conn != null)
{
csType = conn.GetValue().GetType();
csValue = conn.GetValue();
}
if (!sm_bindings.GetBinding(csType, out binding) && !csType.IsEnum)
{
if (string.IsNullOrEmpty(ns))
{
return(false);
}
Serialize(csValue, prim, usdTime, usdNamespace: ns);
return(true);
}
pxr.SdfVariability variability = Reflect.GetVariability(memberInfo);
pxr.SdfValueTypeName sdfTypeName = binding.sdfTypeName;
pxr.UsdTimeCode time = variability == pxr.SdfVariability.SdfVariabilityUniform
? pxr.UsdTimeCode.Default()
: usdTime;
bool custom = false;
pxr.UsdAttribute attr;
if (isCustomData)
{
// no-op
attr = null;
}
else if (!isPrimvar)
{
if (string.IsNullOrEmpty(ns))
{
lock (m_stageLock) {
attr = prim.CreateAttribute(sdfAttrName, csType.IsEnum ? SdfValueTypeNames.Token : sdfTypeName, custom, variability);
}
}
else
{
string[] arr = IntrinsicTypeConverter.JoinNamespace(ns, sdfAttrName).Split(':');
pxr.StdStringVector elts = new pxr.StdStringVector(arr.Length);
foreach (var s in arr)
{
elts.Add(s);
}
lock (m_stageLock) {
attr = prim.CreateAttribute(elts, sdfTypeName, custom, variability);
}
}
}
else
{
// Primvars do not support additional namespaces.
lock (m_stageLock) {
attr = imgble.CreatePrimvar(sdfAttrName, sdfTypeName,
VertexDataAttribute.Interpolation).GetAttr();
}
}
if (attr != null && conn != null && conn.GetConnectedPath() != null)
{
// TODO: Pool temp vector, possibly add a single item overload for SetConnections.
var paths = new pxr.SdfPathVector();
var connPath = conn.GetConnectedPath();
if (connPath != string.Empty)
{
paths.Add(new pxr.SdfPath(conn.GetConnectedPath()));
}
attr.SetConnections(paths);
}
pxr.VtValue vtValue = binding.toVtValue(csValue);
lock (m_stageLock) {
if (isCustomData)
{
prim.SetCustomDataByKey(sdfAttrName, vtValue);
}
else if (Reflect.IsFusedDisplayColor(memberInfo))
{
pxr.UsdCs.SetFusedDisplayColor(prim, vtValue, time);
}
else
{
attr.Set(vtValue, time);
}
}
if (!isCustomData && srcObject != null)
{
lock (m_stageLock) {
attr.SetCustomDataByKey(sm_tokenCache["sourceMember"], srcObject);
}
}
return(true);
}
static void ExportMesh(ObjectContext objContext,
ExportContext exportContext,
Mesh mesh,
Material sharedMaterial,
Material[] sharedMaterials,
bool exportMeshPose = true)
{
if (mesh.isReadable == false)
{
Debug.LogWarning("Mesh not readable: " + objContext.path);
return;
}
string path = objContext.path;
if (mesh == null)
{
Debug.LogWarning("Null mesh for: " + path);
return;
}
var scene = exportContext.scene;
bool unvarying = scene.Time == null;
bool slowAndSafeConversion = exportContext.basisTransform == BasisTransformation.SlowAndSafe;
var sample = (MeshSample)objContext.sample;
var go = objContext.gameObject;
if (mesh.bounds.center == Vector3.zero && mesh.bounds.extents == Vector3.zero)
{
mesh.RecalculateBounds();
}
sample.extent = mesh.bounds;
if (slowAndSafeConversion)
{
// Unity uses a forward vector that matches DirectX, but USD matches OpenGL, so a change of
// basis is required. There are shortcuts, but this is fully general.
sample.ConvertTransform();
sample.extent.center = UnityTypeConverter.ChangeBasis(sample.extent.center);
}
// Only export the mesh topology on the first frame.
if (unvarying)
{
// TODO: Technically a mesh could be the root transform, which is not handled correctly here.
// It should ahve the same logic for root prims as in ExportXform.
sample.transform = XformExporter.GetLocalTransformMatrix(
go.transform,
scene.UpAxis == Scene.UpAxes.Z,
new pxr.SdfPath(path).IsRootPrimPath(),
exportContext.basisTransform);
sample.normals = mesh.normals;
sample.points = mesh.vertices;
sample.tangents = mesh.tangents;
sample.colors = mesh.colors;
if (sample.colors != null && sample.colors.Length == 0)
{
sample.colors = null;
}
if ((sample.colors == null || sample.colors.Length == 0) &&
(sharedMaterial != null && sharedMaterial.HasProperty("_Color")))
{
sample.colors = new Color[1];
sample.colors[0] = sharedMaterial.color.linear;
}
// Gah. There is no way to inspect a meshes UVs.
sample.st = mesh.uv;
// Set face vertex counts and indices.
var tris = mesh.triangles;
if (slowAndSafeConversion)
{
// Unity uses a forward vector that matches DirectX, but USD matches OpenGL, so a change
// of basis is required. There are shortcuts, but this is fully general.
for (int i = 0; i < sample.points.Length; i++)
{
sample.points[i] = UnityTypeConverter.ChangeBasis(sample.points[i]);
if (sample.normals != null && sample.normals.Length == sample.points.Length)
{
sample.normals[i] = UnityTypeConverter.ChangeBasis(sample.normals[i]);
}
}
for (int i = 0; i < tris.Length; i += 3)
{
var t = tris[i];
tris[i] = tris[i + 1];
tris[i + 1] = t;
}
}
sample.SetTriangles(tris);
UnityEngine.Profiling.Profiler.BeginSample("USD: Mesh Write");
scene.Write(path, sample);
UnityEngine.Profiling.Profiler.EndSample();
// TODO: this is a bit of a half-measure, we need real support for primvar interpolation.
// Set interpolation based on color count.
if (sample.colors != null && sample.colors.Length == 1)
{
pxr.UsdPrim usdPrim = scene.GetPrimAtPath(path);
var colorPrimvar = new pxr.UsdGeomPrimvar(usdPrim.GetAttribute(pxr.UsdGeomTokens.primvarsDisplayColor));
colorPrimvar.SetInterpolation(pxr.UsdGeomTokens.constant);
var opacityPrimvar = new pxr.UsdGeomPrimvar(usdPrim.GetAttribute(pxr.UsdGeomTokens.primvarsDisplayOpacity));
opacityPrimvar.SetInterpolation(pxr.UsdGeomTokens.constant);
}
string usdMaterialPath;
if (exportContext.exportMaterials && sharedMaterial != null)
{
if (!exportContext.matMap.TryGetValue(sharedMaterial, out usdMaterialPath))
{
Debug.LogError("Invalid material bound for: " + path);
}
else
{
MaterialSample.Bind(scene, path, usdMaterialPath);
}
}
// In USD subMeshes are represented as UsdGeomSubsets.
// When there are multiple subMeshes, convert them into UsdGeomSubsets.
if (mesh.subMeshCount > 1)
{
// Build a table of face indices, used to convert the subMesh triangles to face indices.
var faceTable = new Dictionary <Vector3, int>();
for (int i = 0; i < tris.Length; i += 3)
{
if (!slowAndSafeConversion)
{
faceTable.Add(new Vector3(tris[i], tris[i + 1], tris[i + 2]), i / 3);
}
else
{
// Under slow and safe export, index 0 and 1 are swapped.
// This swap will not be present in the subMesh indices, so must be undone here.
faceTable.Add(new Vector3(tris[i + 1], tris[i], tris[i + 2]), i / 3);
}
}
var usdPrim = scene.GetPrimAtPath(path);
var usdGeomMesh = new pxr.UsdGeomMesh(usdPrim);
// Process each subMesh and create a UsdGeomSubset of faces this subMesh targets.
for (int si = 0; si < mesh.subMeshCount; si++)
{
int[] indices = mesh.GetTriangles(si);
int[] faceIndices = new int[indices.Length / 3];
for (int i = 0; i < indices.Length; i += 3)
{
faceIndices[i / 3] = faceTable[new Vector3(indices[i], indices[i + 1], indices[i + 2])];
}
var materialBindToken = new pxr.TfToken("materialBind");
var vtIndices = UnityTypeConverter.ToVtArray(faceIndices);
var subset = pxr.UsdGeomSubset.CreateUniqueGeomSubset(
usdGeomMesh, // The object of which this subset belongs.
"subMeshes", // An arbitrary name for the subset.
pxr.UsdGeomTokens.face, // Indicator that these represent face indices
vtIndices, // The actual face indices.
materialBindToken // familyName = "materialBind"
);
if (exportContext.exportMaterials)
{
if (si >= sharedMaterials.Length || !exportContext.matMap.TryGetValue(sharedMaterials[si], out usdMaterialPath))
{
Debug.LogError("Invalid material bound for: " + path);
}
else
{
MaterialSample.Bind(scene, subset.GetPath(), usdMaterialPath);
}
}
}
}
}
else
{
// Only write the transform when animating.
var meshSample = new MeshSampleBase();
meshSample.extent = sample.extent;
meshSample.transform = XformExporter.GetLocalTransformMatrix(
go.transform,
scene.UpAxis == Scene.UpAxes.Z,
new pxr.SdfPath(path).IsRootPrimPath(),
exportContext.basisTransform);
if (exportMeshPose)
{
meshSample.points = mesh.vertices;
// Set face vertex counts and indices.
var tris = mesh.triangles;
if (slowAndSafeConversion)
{
// Unity uses a forward vector that matches DirectX, but USD matches OpenGL, so a change
// of basis is required. There are shortcuts, but this is fully general.
for (int i = 0; i < meshSample.points.Length; i++)
{
meshSample.points[i] = UnityTypeConverter.ChangeBasis(meshSample.points[i]);
}
for (int i = 0; i < tris.Length; i += 3)
{
var t = tris[i];
tris[i] = tris[i + 1];
tris[i + 1] = t;
}
}
sample.SetTriangles(tris);
}
UnityEngine.Profiling.Profiler.BeginSample("USD: Mesh Write");
scene.Write(path, meshSample);
UnityEngine.Profiling.Profiler.EndSample();
}
}
