static void InitExportableObjects(GameObject go,
ExportContext context) {
var smr = go.GetComponent<SkinnedMeshRenderer>();
var mr = go.GetComponent<MeshRenderer>();
var mf = go.GetComponent<MeshFilter>();
var cam = go.GetComponent<Camera>();
Transform expRoot = context.exportRoot;
var tmpPath = new pxr.SdfPath(UnityTypeConverter.GetPath(go.transform, expRoot));
while (!tmpPath.IsRootPrimPath()) {
tmpPath = tmpPath.GetParentPath();
}
// TODO: What if this path is in use?
string materialBasePath = tmpPath.ToString() + "/Materials/";
// Ensure the "Materials" prim is defined with a valid prim type.
context.scene.Write(materialBasePath.TrimEnd('/'), new ScopeSample());
if (smr != null) {
foreach (var mat in smr.sharedMaterials) {
if (!context.matMap.ContainsKey(mat)) {
string usdPath = materialBasePath + pxr.UsdCs.TfMakeValidIdentifier(mat.name + "_" + mat.GetInstanceID().ToString());
context.matMap.Add(mat, usdPath);
}
}
CreateExportPlan(go, CreateSample<MeshSample>(context), MeshExporter.ExportSkinnedMesh, context);
CreateExportPlan(go, CreateSample<MeshSample>(context), NativeExporter.ExportObject, context, insertFirst: false);
if (smr.rootBone == null) {
Debug.LogWarning("No root bone at: " + UnityTypeConverter.GetPath(go.transform, expRoot));
} else if (smr.bones == null || smr.bones.Length == 0) {
Debug.LogWarning("No bones at: " + UnityTypeConverter.GetPath(go.transform, expRoot));
} else {
// Each mesh in a model may have a different root bone, which now must be merged into a
// single skeleton for export to USD.
try {
MergeBonesSimple(smr.transform, smr.rootBone, smr.bones, smr.sharedMesh.bindposes, context);
} catch (Exception ex) {
Debug.LogException(new Exception("Failed to merge bones for " + UnityTypeConverter.GetPath(smr.transform), ex));
}
}
} else if (mf != null && mr != null) {
foreach (var mat in mr.sharedMaterials) {
if (mat == null) {
continue;
}
if (!context.matMap.ContainsKey(mat)) {
string usdPath = materialBasePath + pxr.UsdCs.TfMakeValidIdentifier(mat.name + "_" + mat.GetInstanceID().ToString());
context.matMap.Add(mat, usdPath);
}
}
CreateExportPlan(go, CreateSample<MeshSample>(context), MeshExporter.ExportMesh, context);
CreateExportPlan(go, CreateSample<MeshSample>(context), NativeExporter.ExportObject, context, insertFirst: false);
} else if (cam) {
CreateExportPlan(go, CreateSample<CameraSample>(context), CameraExporter.ExportCamera, context);
CreateExportPlan(go, CreateSample<CameraSample>(context), NativeExporter.ExportObject, context, insertFirst: false);
}
}
public static void Export(GameObject root,
ExportContext context,
bool zeroRootTransform)
{
// Remove parent transform effects while exporting.
// This must be restored before returning from this function.
var parent = root.transform.parent;
if (zeroRootTransform)
{
root.transform.SetParent(null, worldPositionStays: false);
}
// Also zero out and restore local rotations on the root.
var localPos = root.transform.localPosition;
var localRot = root.transform.localRotation;
var localScale = root.transform.localScale;
if (zeroRootTransform)
{
root.transform.localPosition = Vector3.zero;
root.transform.localRotation = Quaternion.identity;
root.transform.localScale = Vector3.one;
}
// Scale overall scene for export (e.g. USDZ export needs scale 100)
root.transform.localScale *= context.scale;
UnityEngine.Profiling.Profiler.BeginSample("USD: Export");
try
{
ExportImpl(root, context);
var path = new pxr.SdfPath(UnityTypeConverter.GetPath(root.transform));
var prim = context.scene.Stage.GetPrimAtPath(path);
if (prim)
{
context.scene.Stage.SetDefaultPrim(prim);
}
}
finally
{
if (zeroRootTransform)
{
root.transform.localPosition = localPos;
root.transform.localRotation = localRot;
root.transform.localScale = localScale;
root.transform.SetParent(parent, worldPositionStays: false);
}
else
{
root.transform.localScale = localScale;
}
UnityEngine.Profiling.Profiler.EndSample();
}
}
public static void ExportSkelRoot(ObjectContext objContext, ExportContext exportContext)
{
var sample = (SkelRootSample)objContext.sample;
// Compute bounds for the root, required by USD.
bool first = true;
// Ensure the bounds are computed in root-local space.
// This is required because USD expects the extent to be a local bound for the SkelRoot.
var oldParent = objContext.gameObject.transform.parent;
objContext.gameObject.transform.SetParent(null, worldPositionStays: false);
try
{
foreach (var r in objContext.gameObject.GetComponentsInChildren <Renderer>())
{
if (first)
{
// Ensure the bounds object starts growing from the first valid child bounds.
first = false;
sample.extent = r.bounds;
}
else
{
sample.extent.Encapsulate(r.bounds);
}
}
}
finally
{
// Restore the root parent.
objContext.gameObject.transform.SetParent(oldParent, worldPositionStays: false);
}
// Convert handedness if needed.
if (exportContext.basisTransform == BasisTransformation.SlowAndSafe)
{
sample.extent.center = UnityTypeConverter.ChangeBasis(sample.extent.center);
}
// Convert the transform
var path = new pxr.SdfPath(objContext.path);
// If exporting for Z-Up, rotate the world.
bool correctZUp = exportContext.scene.UpAxis == Scene.UpAxes.Z;
sample.transform = XformExporter.GetLocalTransformMatrix(
objContext.gameObject.transform,
correctZUp,
path.IsRootPrimPath(),
exportContext.basisTransform);
exportContext.scene.Write(objContext.path, sample);
}
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);
}
}
/// <summary>
/// Copies the transform value from USD to Unity, optionally changing handedness in the
/// process.
/// </summary>
public static void BuildXform(pxr.SdfPath path,
XformableSample usdXf,
GameObject go,
SceneImportOptions options,
Scene scene)
{
// If there is an access mask and it's not initially being populated, check to see if the
// transform for this object actually varies over time, if not, we can simply return.
if (scene.AccessMask != null && !scene.IsPopulatingAccessMask)
{
System.Reflection.MemberInfo transformMember = null;
transformMember = usdXf.GetType().GetMember("transform")[0];
HashSet <System.Reflection.MemberInfo> members;
if (!scene.AccessMask.Included.TryGetValue(path, out members) ||
!members.Contains(transformMember))
{
return;
}
}
BuildXform(usdXf.transform, go, options);
}
public static void ExportXform(ObjectContext objContext, ExportContext exportContext)
{
UnityEngine.Profiling.Profiler.BeginSample("USD: Xform Conversion");
XformSample sample = (XformSample)objContext.sample;
var localRot = objContext.gameObject.transform.localRotation;
var localScale = objContext.gameObject.transform.localScale;
var path = new pxr.SdfPath(objContext.path);
// If exporting for Z-Up, rotate the world.
bool correctZUp = exportContext.scene.UpAxis == Scene.UpAxes.Z;
sample.transform = GetLocalTransformMatrix(
objContext.gameObject.transform,
correctZUp,
path.IsRootPrimPath(),
exportContext.basisTransform);
UnityEngine.Profiling.Profiler.EndSample();
UnityEngine.Profiling.Profiler.BeginSample("USD: Xform Write");
exportContext.scene.Write(objContext.path, sample);
UnityEngine.Profiling.Profiler.EndSample();
}
//
// Start generates a USD scene procedurally, containing a single cube with a material, shader
// and texture bound. It then inspects the cube to discover the material. A Unity material is
// constructed and the parameters are copied in a generic way. Similarly, the texture is
// discovered and loaded as a Unity Texture2D and bound to the material.
//
// Also See: https://docs.unity3d.com/Manual/MaterialsAccessingViaScript.html
//
void Start()
{
// Create a scene for this test, but could also be read from disk.
Scene usdScene = CreateSceneWithShading();
// Read the material and shader ID.
var usdMaterial = new MaterialSample();
string shaderId;
// ReadMaterial was designed for Unity and assumes there is one "surface" shader bound.
if (!MaterialSample.ReadMaterial(usdScene, kCubePath, usdMaterial, out shaderId))
{
throw new System.Exception("Failed to read material");
}
// Map the shader ID to the corresponding Unity/USD shader pair.
ShaderPair shader;
if (shaderId == null || !m_shaderMap.TryGetValue(shaderId, out shader))
{
throw new System.Exception("Material had no surface bound");
}
//
// Read and process the shader-specific parameters.
//
// UsdShade requires all connections target an attribute, but we actually want to deserialize
// the entire prim, so we get just the prim path here.
var shaderPath = new pxr.SdfPath(usdMaterial.surface.connectedPath).GetPrimPath();
usdScene.Read(shaderPath, shader.usdShader);
//
// Construct material & process the inputs, textures, and keywords.
//
var mat = new UnityEngine.Material(shader.unityShader);
// Apply material keywords.
foreach (string keyword in usdMaterial.requiredKeywords ?? new string[0])
{
mat.EnableKeyword(keyword);
}
// Iterate over all input parameters and copy values and/or construct textures.
foreach (var param in shader.usdShader.GetInputParameters())
{
if (!SetMaterialParameter(mat, param.unityName, param.value))
{
throw new System.Exception("Incompatible shader data type: " + param.ToString());
}
}
foreach (var param in shader.usdShader.GetInputTextures())
{
if (string.IsNullOrEmpty(param.connectedPath))
{
// Not connected to a texture.
continue;
}
// Only 2D textures are supported in this example.
var usdTexture = new Texture2DSample();
// Again, we want the prim path, not the attribute path.
var texturePath = new pxr.SdfPath(param.connectedPath).GetPrimPath();
usdScene.Read(texturePath, usdTexture);
// This example also only supports explicit sourceFiles, they cannot be connected.
if (string.IsNullOrEmpty(usdTexture.sourceFile.defaultValue))
{
continue;
}
// For details, see: https://docs.unity3d.com/Manual/MaterialsAccessingViaScript.html
foreach (string keyword in param.requiredShaderKeywords)
{
mat.EnableKeyword(keyword);
}
var data = System.IO.File.ReadAllBytes(usdTexture.sourceFile.defaultValue);
var unityTex = new Texture2D(2, 2);
unityTex.LoadImage(data);
mat.SetTexture(param.unityName, unityTex);
Debug.Log("Set " + param.unityName + " to " + usdTexture.sourceFile.defaultValue);
unityTex.Apply(updateMipmaps: true, makeNoLongerReadable: false);
}
//
// Create and bind the geometry.
//
// Create a cube and set the material.
// Note that geometry is handled minimally here and is incomplete.
var cubeSample = new CubeSample();
usdScene.Read(kCubePath, cubeSample);
var go = GameObject.CreatePrimitive(PrimitiveType.Cube);
go.transform.SetParent(transform, worldPositionStays: false);
go.transform.localScale = Vector3.one * (float)cubeSample.size;
m_cube = transform;
go.GetComponent <MeshRenderer>().material = mat;
}
public static void SdfPathEqualityTest()
{
var A = new pxr.SdfPath("/Foo");
var B = new pxr.SdfPath("/Foo");
var C = new pxr.SdfPath("/Foo/Bar");
AssertEqual(A, A);
AssertEqual(B, B);
AssertEqual(C, C);
AssertEqual(A, B);
AssertEqual(A, C.GetParentPath());
AssertEqual(C.GetParentPath(), A);
AssertEqual(A.GetHashCode(), A.GetHashCode());
AssertEqual(B.GetHashCode(), B.GetHashCode());
AssertEqual(C.GetHashCode(), C.GetHashCode());
AssertEqual(A.GetHashCode(), B.GetHashCode());
AssertEqual(A.GetHashCode(), C.GetParentPath().GetHashCode());
AssertEqual(C.GetParentPath().GetHashCode(), A.GetHashCode());
AssertEqual(A.GetHash(), A.GetHash());
AssertEqual(B.GetHash(), B.GetHash());
AssertEqual(C.GetHash(), C.GetHash());
AssertEqual(A.GetHash(), B.GetHash());
AssertEqual(A.GetHash(), C.GetParentPath().GetHash());
AssertEqual(C.GetParentPath().GetHash(), A.GetHash());
AssertEqual(A.ToString(), A.ToString());
AssertEqual(B.ToString(), B.ToString());
AssertEqual(C.ToString(), C.ToString());
AssertEqual(A.ToString(), B.ToString());
AssertEqual(A.ToString(), C.GetParentPath().ToString());
AssertEqual(C.GetParentPath().ToString(), A.ToString());
var hashSet = new HashSet <pxr.SdfPath>();
hashSet.Add(A);
AssertTrue(hashSet.Contains(A));
AssertTrue(hashSet.Contains(B));
AssertTrue(hashSet.Contains(C.GetParentPath()));
AssertTrue(hashSet.Remove(B));
hashSet.Add(B);
AssertTrue(hashSet.Contains(A));
AssertTrue(hashSet.Contains(B));
AssertTrue(hashSet.Contains(C.GetParentPath()));
AssertTrue(hashSet.Remove(C.GetParentPath()));
var dict = new Dictionary <pxr.SdfPath, string>();
dict.Add(A, A.GetString());
AssertTrue(dict.ContainsKey(A));
AssertTrue(dict.ContainsKey(B));
AssertTrue(dict.ContainsKey(C.GetParentPath()));
AssertTrue(dict.Remove(B));
dict.Add(B, B.GetString());
AssertTrue(dict.ContainsKey(A));
AssertTrue(dict.ContainsKey(B));
AssertTrue(dict.ContainsKey(C.GetParentPath()));
AssertTrue(dict.Remove(C.GetParentPath()));
}
/// <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;
}
}
// -------------------------------------------------------------------------------------------- //
// Export Logic
// -------------------------------------------------------------------------------------------- //
/// Exports either all brush strokes or the given selection to the specified file.
static public void ExportPayload(string outputFile)
{
// Would be nice to find a way to kick this off automatically.
// Redundant calls are ignored.
if (!InitUsd.Initialize())
{
return;
}
// Unity is left handed (DX), USD is right handed (GL)
var payload = ExportCollector.GetExportPayload(AxisConvention.kUsd);
var brushCatalog = BrushCatalog.m_Instance;
// The Scene object provids serialization methods arbitrary C# objects to USD.
USD.NET.Scene scene = USD.NET.Scene.Create(outputFile);
// The target time at which samples will be written.
//
// In this case, all data is being written to the "default" time, which means it can be
// overridden by animated values later.
scene.Time = null;
// Bracketing times to specify the valid animation range.
scene.StartTime = 1.0;
scene.EndTime = 1.0;
const string kGeomName = "/Geom";
const string kCurvesName = "/Curves";
string path = "";
AddSketchRoot(scene, GetSketchPath()); // Create: </Sketch>
CreateXform(scene, GetStrokesPath()); // Create: </Sketch/Strokes>
CreateXform(scene, GetModelsPath()); // Create: </Sketch/Models>
// Main export loop.
try
{
foreach (ExportUtils.GroupPayload group in payload.groups)
{
// Example: </Sketch/Strokes/Group_0>
path = GetGroupPath(group.id);
CreateXform(scene, path);
// Example: </Sketch/Strokes/Group_0/Geom>
CreateXform(scene, path + kGeomName);
// Example: </Sketch/Strokes/Group_0/Curves>
CreateXform(scene, path + kCurvesName);
int iBrushMeshPayload = -1;
foreach (var brushMeshPayload in group.brushMeshes)
{
++iBrushMeshPayload;
// Conditionally moves Normal into Texcoord1 so that the normal semantic is respected.
// This only has an effect when layout.bFbxExportNormalAsTexcoord1 == true.
// Note that this modifies the GeometryPool in place.
FbxUtils.ApplyFbxTexcoordHack(brushMeshPayload.geometry);
// Brushes are expected to be batched by type/GUID.
Guid brushGuid = brushMeshPayload.strokes[0].m_BrushGuid;
string brushName = "/" +
SanitizeIdentifier(brushCatalog.GetBrush(brushGuid).DurableName) + "_";
// Example: </Sketch/Strokes/Group_0/Geom/Marker_0>
string meshPath = path + kGeomName + brushName;
// Example: </Sketch/Strokes/Group_0/Curves/Marker_0>
string curvePath = path + kCurvesName + brushName;
var geomPool = brushMeshPayload.geometry;
var strokes = brushMeshPayload.strokes;
var mat44 = Matrix4x4.identity;
var meshPrimPath = new pxr.SdfPath(meshPath + iBrushMeshPayload.ToString());
var curvesPrimPath = new pxr.SdfPath(curvePath + iBrushMeshPayload.ToString());
//
// Geometry
//
BrushSample brushSample = GetBrushSample(geomPool, strokes, mat44);
// Write the BrushSample to the same point in the scenegraph at which it exists in Tilt
// Brush. Notice this method is Async, it is queued to a background thread to perform I/O
// which means it is not safe to read from the scene until WaitForWrites() is called.
scene.Write(meshPrimPath, brushSample);
//
// Stroke Curves
//
var curvesSample = GetCurvesSample(payload, strokes, Matrix4x4.identity);
scene.Write(curvesPrimPath, curvesSample);
//
// Materials
//
double?oldTime = scene.Time;
scene.Time = null;
string materialPath = CreateMaterialNetwork(
scene,
brushMeshPayload.exportableMaterial,
GetStrokesPath());
BindMaterial(scene, meshPrimPath.ToString(), materialPath);
BindMaterial(scene, curvesPrimPath.ToString(), materialPath);
scene.Time = oldTime;
}
}
//
// Models
//
var knownModels = new Dictionary <Model, string>();
int iModelMeshPayload = -1;
foreach (var modelMeshPayload in payload.modelMeshes)
{
++iModelMeshPayload;
var modelId = modelMeshPayload.modelId;
var modelNamePrefix = "/Model_"
+ SanitizeIdentifier(modelMeshPayload.model.GetExportName())
+ "_";
var modelName = modelNamePrefix + modelId;
var xf = modelMeshPayload.xform;
// Geometry pools may be repeated and should be turned into references.
var geomPool = modelMeshPayload.geometry;
var modelRootPath = new pxr.SdfPath(GetModelsPath() + modelName);
// Example: </Sketch/Models/Model_Andy_0>
CreateXform(scene, modelRootPath, xf);
// Example: </Sketch/Models/Model_Andy_0/Geom>
CreateXform(scene, modelRootPath + kGeomName);
string modelPathToReference;
if (knownModels.TryGetValue(modelMeshPayload.model, out modelPathToReference) &&
modelPathToReference != modelRootPath)
{
// Create an Xform, note that the world transform here will override the referenced model.
var meshXf = new MeshXformSample();
meshXf.transform = xf;
scene.Write(modelRootPath, meshXf);
// Add a USD reference to previously created model.
var prim = scene.Stage.GetPrimAtPath(modelRootPath);
prim.GetReferences().AddReference("", new pxr.SdfPath(modelPathToReference));
continue;
}
// Example: </Sketch/Models/Geom/Model_Andy_0/Mesh_0>
path = modelRootPath + kGeomName + "/Mesh_" + iModelMeshPayload.ToString();
var meshPrimPath = new pxr.SdfPath(path);
var meshSample = new MeshSample();
GetMeshSample(geomPool, Matrix4x4.identity, meshSample);
scene.Write(path, meshSample);
scene.Stage.GetPrimAtPath(new pxr.SdfPath(path)).SetInstanceable(true);
//
// Materials
//
// Author at default time.
double?oldTime = scene.Time;
scene.Time = null;
// Model materials must live under the model root, since we will reference the model.
string materialPath = CreateMaterialNetwork(
scene,
modelMeshPayload.exportableMaterial,
modelRootPath);
BindMaterial(scene, meshPrimPath.ToString(), materialPath);
// Continue authoring at the desired time index.
scene.Time = oldTime;
//
// Setup to be referenced.
//
if (!knownModels.ContainsKey(modelMeshPayload.model))
{
knownModels.Add(modelMeshPayload.model, modelRootPath);
}
}
}
catch
{
scene.Save();
scene.Close();
throw;
}
// Save will force a sync with all async reads and writes.
scene.Save();
scene.Close();
}
private static string GetObjectName(pxr.SdfPath rootPrimName, string path)
{
return(pxr.UsdCs.TfIsValidIdentifier(rootPrimName.GetName())
? rootPrimName.GetName()
: GetObjectName(path));
}
public static Texture2D ImportConnectedTexture <T>(Scene scene,
Connectable <T> connection,
bool isNormalMap,
SceneImportOptions options,
out string uvPrimvar)
{
uvPrimvar = null;
// TODO: look for the expected texture/primvar reader pair.
var textureSample = new TextureReaderSample();
var connectedPrimPath = scene.GetSdfPath(connection.connectedPath).GetPrimPath();
Texture2D result = null;
scene.Read(connectedPrimPath, textureSample);
if (textureSample.file.defaultValue != null &&
!string.IsNullOrEmpty(textureSample.file.defaultValue.GetResolvedPath()))
{
if (OnResolveTexture != null)
{
result = OnResolveTexture(textureSample.file.defaultValue, isNormalMap, options);
}
else
{
result = DefaultTextureResolver(textureSample.file.defaultValue, isNormalMap, options);
}
}
Connectable <Vector2> st = textureSample.st;
if (st != null && st.IsConnected() && !string.IsNullOrEmpty(st.connectedPath))
{
var pvSrc = new PrimvarReaderSample <Vector2>();
scene.Read(new pxr.SdfPath(textureSample.st.connectedPath).GetPrimPath(), pvSrc);
if (pvSrc.varname != null)
{
if (pvSrc.varname.IsConnected())
{
var connPath = new pxr.SdfPath(pvSrc.varname.GetConnectedPath());
var attr = scene.GetAttributeAtPath(connPath);
if (attr != null)
{
var value = attr.Get(scene.Time);
uvPrimvar = pxr.UsdCs.VtValueToTfToken(value).ToString();
}
else
{
Debug.LogWarning("No primvar name was provided at the connected path: " + connPath);
uvPrimvar = "";
}
}
else if (pvSrc.varname.defaultValue != null)
{
// Ask the mesh importer to load the specified texcoord.
// This must be a callback, since materials-to-meshes are one-to-many.
uvPrimvar = pvSrc.varname.defaultValue;
}
}
}
return(result);
}
/// <summary>
/// Rebuilds the USD scene as Unity GameObjects, with a limited budget per update.
/// </summary>
public static IEnumerator BuildScene(Scene scene,
GameObject root,
SceneImportOptions importOptions,
PrimMap primMap,
float targetFrameMilliseconds,
bool composingSubtree)
{
var timer = new System.Diagnostics.Stopwatch();
var usdPrimRoot = new pxr.SdfPath(importOptions.usdRootPath);
// Setting an arbitrary fudge factor of 20% is very non-scientific, however it's better than
// nothing. The correct way to hit a deadline is to predict how long each iteration actually
// takes and then return early if the estimated time is over budget.
float targetTime = targetFrameMilliseconds * .8f;
timer.Start();
// Reconstruct the USD hierarchy as Unity GameObjects.
// A PrimMap is returned for tracking the USD <-> Unity mapping.
Profiler.BeginSample("USD: Build Hierarchy");
if (importOptions.importHierarchy || importOptions.forceRebuild)
{
// When a USD file is fully RE-imported, all exsiting USD data must be removed. The old
// assumption was that the root would never have much more than the UsdAsset component
// itself, however it's now clear that the root may also have meaningful USD data added
// too.
//
// TODO(jcowles): This feels like a workaround. What we really want here is an "undo"
// process for changes made to the root GameObject. For example, to clean up non-USD
// components which may have been added (e.g. what if a mesh is imported to the root?
// currently the MeshRenderer etc will remain after re-import).
RemoveComponent <UsdAssemblyRoot>(root);
RemoveComponent <UsdVariantSet>(root);
RemoveComponent <UsdModelRoot>(root);
RemoveComponent <UsdLayerStack>(root);
RemoveComponent <UsdPayload>(root);
RemoveComponent <UsdPrimSource>(root);
primMap.Clear();
HierarchyBuilder.BuildGameObjects(scene,
root,
usdPrimRoot,
scene.Find(usdPrimRoot.ToString(), "UsdSchemaBase"),
primMap,
importOptions);
}
Profiler.EndSample();
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
Profiler.BeginSample("USD: Post Process Hierarchy");
foreach (var processor in root.GetComponents <IImportPostProcessHierarchy>())
{
try {
processor.PostProcessHierarchy(primMap, importOptions);
} catch (System.Exception ex) {
Debug.LogException(ex);
}
}
Profiler.EndSample();
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
//
// Pre-process UsdSkelRoots.
//
var skelRoots = new List <pxr.UsdSkelRoot>();
if (importOptions.importSkinning)
{
Profiler.BeginSample("USD: Process UsdSkelRoots");
foreach (var path in primMap.SkelRoots)
{
try {
var skelRootPrim = scene.GetPrimAtPath(path);
if (!skelRootPrim)
{
Debug.LogWarning("SkelRoot prim not found: " + path);
continue;
}
var skelRoot = new pxr.UsdSkelRoot(skelRootPrim);
if (!skelRoot)
{
Debug.LogWarning("SkelRoot prim not SkelRoot type: " + path);
continue;
}
skelRoots.Add(skelRoot);
GameObject go = primMap[path];
ImporterBase.GetOrAddComponent <Animator>(go, true);
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error pre-processing SkelRoot <" + path + ">", ex));
}
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
}
Profiler.EndSample();
}
//
// Import known prim types.
//
// Materials.
Profiler.BeginSample("USD: Build Materials");
if (importOptions.ShouldBindMaterials)
{
foreach (var pathAndSample in scene.ReadAll <MaterialSample>(primMap.Materials))
{
try {
var mat = MaterialImporter.BuildMaterial(scene,
pathAndSample.path,
pathAndSample.sample,
importOptions);
if (mat != null)
{
importOptions.materialMap[pathAndSample.path] = mat;
}
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing material <" + pathAndSample.path + ">", ex));
}
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
}
}
Profiler.EndSample();
//
// Start threads.
//
ReadAllJob <XformSample> readXforms;
if (importOptions.importTransforms)
{
readXforms = new ReadAllJob <XformSample>(scene, primMap.Xforms);
#if UNITY_2018_1_OR_NEWER
readXforms.Schedule(primMap.Xforms.Length, 4);
#else
readXforms.Run();
#endif
}
if (importOptions.importMeshes)
{
ActiveMeshImporter.BeginReading(scene, primMap);
}
#if UNITY_2018_1_OR_NEWER
JobHandle.ScheduleBatchedJobs();
#endif
// Xforms.
//
// Note that we are specifically filtering on XformSample, not Xformable, this way only
// Xforms are processed to avoid doing that work redundantly.
if (importOptions.importTransforms)
{
Profiler.BeginSample("USD: Build Xforms");
foreach (var pathAndSample in readXforms)
{
try {
if (pathAndSample.path == usdPrimRoot)
{
// Never read the xform from the USD root, that will be authored in Unity.
continue;
}
GameObject go = primMap[pathAndSample.path];
NativeImporter.ImportObject(scene, go, scene.GetPrimAtPath(pathAndSample.path), importOptions);
XformImporter.BuildXform(pathAndSample.path, pathAndSample.sample, go, importOptions, scene);
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing xform <" + pathAndSample.path + ">", ex));
}
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
}
foreach (var pathAndSample in scene.ReadAll <XformSample>(primMap.SkelRoots))
{
try {
if (pathAndSample.path == usdPrimRoot)
{
// Never read the xform from the USD root, that will be authored in Unity.
continue;
}
GameObject go = primMap[pathAndSample.path];
NativeImporter.ImportObject(scene, go, scene.GetPrimAtPath(pathAndSample.path), importOptions);
XformImporter.BuildXform(pathAndSample.path, pathAndSample.sample, go, importOptions, scene);
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing xform <" + pathAndSample.path + ">", ex));
}
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
}
if (importOptions.importSkinning)
{
foreach (var pathAndSample in scene.ReadAll <XformSample>(primMap.Skeletons))
{
try {
if (pathAndSample.path == usdPrimRoot)
{
// Never read the xform from the USD root, that will be authored in Unity.
continue;
}
GameObject go = primMap[pathAndSample.path];
NativeImporter.ImportObject(scene, go, scene.GetPrimAtPath(pathAndSample.path), importOptions);
XformImporter.BuildXform(pathAndSample.path, pathAndSample.sample, go, importOptions, scene);
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing xform <" + pathAndSample.path + ">", ex));
}
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
}
}
Profiler.EndSample();
}
// Meshes.
if (importOptions.importMeshes)
{
Profiler.BeginSample("USD: Build Meshes");
IEnumerator it = ActiveMeshImporter.Import(scene, primMap, importOptions);
while (it.MoveNext())
{
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
}
Profiler.EndSample();
// Cubes.
Profiler.BeginSample("USD: Build Cubes");
foreach (var pathAndSample in scene.ReadAll <CubeSample>(primMap.Cubes))
{
try {
GameObject go = primMap[pathAndSample.path];
NativeImporter.ImportObject(scene, go, scene.GetPrimAtPath(pathAndSample.path), importOptions);
XformImporter.BuildXform(pathAndSample.path, pathAndSample.sample, go, importOptions, scene);
CubeImporter.BuildCube(pathAndSample.sample, go, importOptions);
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing cube <" + pathAndSample.path + ">", ex));
}
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
}
Profiler.EndSample();
}
// Cameras.
if (importOptions.importCameras)
{
Profiler.BeginSample("USD: Cameras");
foreach (var pathAndSample in scene.ReadAll <CameraSample>(primMap.Cameras))
{
try {
GameObject go = primMap[pathAndSample.path];
NativeImporter.ImportObject(scene, go, scene.GetPrimAtPath(pathAndSample.path), importOptions);
XformImporter.BuildXform(pathAndSample.path, pathAndSample.sample, go, importOptions, scene);
// The camera has many value-type parameters that need to be handled correctly when not
// not animated. For now, only the camera transform will animate, until this is fixed.
if (scene.AccessMask == null || scene.IsPopulatingAccessMask)
{
CameraImporter.BuildCamera(pathAndSample.sample, go, importOptions);
}
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing camera <" + pathAndSample.path + ">", ex));
}
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
}
Profiler.EndSample();
}
// Build out masters for instancing.
Profiler.BeginSample("USD: Build Instances");
foreach (var masterRootPath in primMap.GetMasterRootPaths())
{
try {
Transform masterRootXf = primMap[masterRootPath].transform;
// Transforms
if (importOptions.importTransforms)
{
Profiler.BeginSample("USD: Build Xforms");
foreach (var pathAndSample in scene.ReadAll <XformSample>(masterRootPath))
{
try {
GameObject go = primMap[pathAndSample.path];
NativeImporter.ImportObject(scene, go, scene.GetPrimAtPath(pathAndSample.path), importOptions);
XformImporter.BuildXform(pathAndSample.path, pathAndSample.sample, go, importOptions, scene);
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing xform <" + pathAndSample.path + ">", ex));
}
}
foreach (var pathAndSample in scene.ReadAll <XformSample>(masterRootPath))
{
try {
GameObject go = primMap[pathAndSample.path];
NativeImporter.ImportObject(scene, go, scene.GetPrimAtPath(pathAndSample.path), importOptions);
XformImporter.BuildXform(pathAndSample.path, pathAndSample.sample, go, importOptions, scene);
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing xform <" + pathAndSample.path + ">", ex));
}
}
foreach (var pathAndSample in scene.ReadAll <XformSample>(primMap.Skeletons))
{
try {
GameObject go = primMap[pathAndSample.path];
NativeImporter.ImportObject(scene, go, scene.GetPrimAtPath(pathAndSample.path), importOptions);
XformImporter.BuildXform(pathAndSample.path, pathAndSample.sample, go, importOptions, scene);
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing xform <" + pathAndSample.path + ">", ex));
}
}
Profiler.EndSample();
}
// Meshes.
if (importOptions.importMeshes)
{
Profiler.BeginSample("USD: Build Meshes");
foreach (var pathAndSample in scene.ReadAll <MeshSample>(masterRootPath))
{
try {
GameObject go = primMap[pathAndSample.path];
NativeImporter.ImportObject(scene, go, scene.GetPrimAtPath(pathAndSample.path), importOptions);
XformImporter.BuildXform(pathAndSample.path, pathAndSample.sample, go, importOptions, scene);
var subsets = MeshImporter.ReadGeomSubsets(scene, pathAndSample.path);
MeshImporter.BuildMesh(pathAndSample.path, pathAndSample.sample, subsets, go, importOptions);
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing mesh <" + pathAndSample.path + ">", ex));
}
}
Profiler.EndSample();
// Cubes.
Profiler.BeginSample("USD: Build Cubes");
foreach (var pathAndSample in scene.ReadAll <CubeSample>(masterRootPath))
{
try {
GameObject go = primMap[pathAndSample.path];
NativeImporter.ImportObject(scene, go, scene.GetPrimAtPath(pathAndSample.path), importOptions);
XformImporter.BuildXform(pathAndSample.path, pathAndSample.sample, go, importOptions, scene);
CubeImporter.BuildCube(pathAndSample.sample, go, importOptions);
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing cube <" + pathAndSample.path + ">", ex));
}
}
Profiler.EndSample();
}
// Cameras.
if (importOptions.importCameras)
{
Profiler.BeginSample("USD: Build Cameras");
foreach (var pathAndSample in scene.ReadAll <CameraSample>(masterRootPath))
{
try {
GameObject go = primMap[pathAndSample.path];
NativeImporter.ImportObject(scene, go, scene.GetPrimAtPath(pathAndSample.path), importOptions);
XformImporter.BuildXform(pathAndSample.path, pathAndSample.sample, go, importOptions, scene);
CameraImporter.BuildCamera(pathAndSample.sample, go, importOptions);
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing camera <" + pathAndSample.path + ">", ex));
}
}
Profiler.EndSample();
}
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing master <" + masterRootPath + ">", ex));
}
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
} // Instances.
Profiler.EndSample();
//
// Post-process dependencies: materials and bones.
//
Profiler.BeginSample("USD: Process Material Bindings");
try {
// TODO: Currently ProcessMaterialBindings runs too long and will go over budget for any
// large scene. However, pulling the loop into this code feels wrong in terms of
// responsibilities.
// Process all material bindings in a single vectorized request.
MaterialImporter.ProcessMaterialBindings(scene, importOptions);
} catch (System.Exception ex) {
Debug.LogException(new ImportException("Failed in ProcessMaterialBindings", ex));
}
Profiler.EndSample();
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
//
// SkinnedMesh bone bindings.
//
if (importOptions.importSkinning)
{
Profiler.BeginSample("USD: Build Skeletons");
var skeletonSamples = new Dictionary <pxr.SdfPath, SkeletonSample>();
foreach (var skelRoot in skelRoots)
{
try {
var bindings = new pxr.UsdSkelBindingVector();
if (!primMap.SkelBindings.TryGetValue(skelRoot.GetPath(), out bindings))
{
Debug.LogWarning("No bindings found skelRoot: " + skelRoot.GetPath());
}
if (bindings.Count == 0)
{
Debug.LogWarning("No bindings found skelRoot: " + skelRoot.GetPath());
}
foreach (var skelBinding in bindings)
{
// The SkelRoot will likely have a skeleton binding, but it's inherited, so the bound
// skeleton isn't actually known until it's queried from the binding. Still, we would
// like not to reprocess skeletons redundantly, so skeletons are cached into a
// dictionary.
Profiler.BeginSample("Build Bind Transforms");
var skelPath = skelBinding.GetSkeleton().GetPath();
SkeletonSample skelSample = null;
if (!skeletonSamples.TryGetValue(skelPath, out skelSample))
{
skelSample = new SkeletonSample();
Profiler.BeginSample("Read Skeleton");
scene.Read(skelPath, skelSample);
Profiler.EndSample();
skeletonSamples.Add(skelPath, skelSample);
// Unity uses the inverse bindTransform, since that's actually what's needed for
// skinning. Do that once here, so each skinned mesh doesn't need to do it
// redundantly.
SkeletonImporter.BuildBindTransforms(skelPath, skelSample, importOptions);
var bindXforms = new pxr.VtMatrix4dArray();
var prim = scene.GetPrimAtPath(skelPath);
var skel = new pxr.UsdSkelSkeleton(prim);
Profiler.BeginSample("Get SkelQuery");
pxr.UsdSkelSkeletonQuery skelQuery = primMap.SkelCache.GetSkelQuery(skel);
Profiler.EndSample();
Profiler.BeginSample("Get JointWorldBind Transforms");
if (!skelQuery.GetJointWorldBindTransforms(bindXforms))
{
throw new ImportException("Failed to compute binding trnsforms for <" + skelPath + ">");
}
Profiler.EndSample();
SkeletonImporter.BuildDebugBindTransforms(skelSample, primMap[skelPath], importOptions);
}
Profiler.EndSample();
if (importOptions.importSkinWeights)
{
//
// Apply skinning weights to each skinned mesh.
//
Profiler.BeginSample("Apply Skin Weights");
foreach (var skinningQuery in skelBinding.GetSkinningTargetsAsVector())
{
var meshPath = skinningQuery.GetPrim().GetPath();
try {
var skelBindingSample = new SkelBindingSample();
var goMesh = primMap[meshPath];
scene.Read(meshPath, skelBindingSample);
Profiler.BeginSample("Build Skinned Mesh");
SkeletonImporter.BuildSkinnedMesh(
meshPath,
skelPath,
skelSample,
skelBindingSample,
goMesh,
primMap,
importOptions);
Profiler.EndSample();
// In terms of performance, this is almost free.
goMesh.GetComponent <SkinnedMeshRenderer>().rootBone = primMap[skelPath].transform.GetChild(0);
} catch (System.Exception ex) {
Debug.LogException(new ImportException("Error skinning mesh: " + meshPath, ex));
}
}
Profiler.EndSample();
}
}
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing SkelRoot <" + skelRoot.GetPath() + ">", ex));
}
} // foreach SkelRoot
Profiler.EndSample();
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
//
// Bone transforms.
//
Profiler.BeginSample("USD: Pose Bones");
foreach (var pathAndSample in skeletonSamples)
{
var skelPath = pathAndSample.Key;
try {
var prim = scene.GetPrimAtPath(skelPath);
var skel = new pxr.UsdSkelSkeleton(prim);
pxr.UsdSkelSkeletonQuery skelQuery = primMap.SkelCache.GetSkelQuery(skel);
var joints = skelQuery.GetJointOrder();
var restXforms = new pxr.VtMatrix4dArray();
var time = scene.Time.HasValue ? scene.Time.Value : pxr.UsdTimeCode.Default();
Profiler.BeginSample("Compute Joint Local Transforms");
if (!skelQuery.ComputeJointLocalTransforms(restXforms, time, atRest: false))
{
throw new ImportException("Failed to compute bind trnsforms for <" + skelPath + ">");
}
Profiler.EndSample();
Profiler.BeginSample("Build Bones");
for (int i = 0; i < joints.size(); i++)
{
var jointPath = scene.GetSdfPath(joints[i]);
if (joints[i] == "/")
{
jointPath = skelPath;
}
else if (jointPath.IsAbsolutePath())
{
Debug.LogException(new System.Exception("Unexpected absolute joint path: " + jointPath));
jointPath = new pxr.SdfPath(joints[i].ToString().TrimStart('/'));
jointPath = skelPath.AppendPath(jointPath);
}
else
{
jointPath = skelPath.AppendPath(jointPath);
}
var goBone = primMap[jointPath];
Profiler.BeginSample("Convert Matrix");
var restXform = UnityTypeConverter.FromMatrix(restXforms[i]);
Profiler.EndSample();
Profiler.BeginSample("Build Bone");
SkeletonImporter.BuildSkeletonBone(skelPath, goBone, restXform, joints, importOptions);
Profiler.EndSample();
}
Profiler.EndSample();
} catch (System.Exception ex) {
Debug.LogException(
new ImportException("Error processing SkelRoot <" + skelPath + ">", ex));
}
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
}
Profiler.EndSample();
}
//
// Apply instancing.
//
if (importOptions.importSceneInstances)
{
Profiler.BeginSample("USD: Build Scene-Instances");
try {
// Build scene instances.
InstanceImporter.BuildSceneInstances(primMap, importOptions);
} catch (System.Exception ex) {
Debug.LogException(new ImportException("Failed in BuildSceneInstances", ex));
}
Profiler.EndSample();
}
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
// Build point instances.
if (importOptions.importPointInstances)
{
Profiler.BeginSample("USD: Build Point-Instances");
// TODO: right now all point instancer data is read, but we only need prototypes and indices.
foreach (var pathAndSample in scene.ReadAll <PointInstancerSample>())
{
try {
GameObject instancerGo = primMap[pathAndSample.path];
// Now build the point instances.
InstanceImporter.BuildPointInstances(scene,
primMap,
pathAndSample.path,
pathAndSample.sample,
instancerGo,
importOptions);
} catch (System.Exception ex) {
Debug.LogError("Error processing point instancer <" + pathAndSample.path + ">: " + ex.Message);
}
if (ShouldYield(targetTime, timer))
{
yield return(null); ResetTimer(timer);
}
}
Profiler.EndSample();
}
//
// Apply root transform corrections.
//
Profiler.BeginSample("USD: Build Root Transforms");
if (!composingSubtree)
{
if (!root)
{
// There is no single root,
// Apply root transform corrections to all imported root prims.
foreach (KeyValuePair <pxr.SdfPath, GameObject> kvp in primMap)
{
if (kvp.Key.IsRootPrimPath() && kvp.Value != null)
{
// The root object at which the USD scene will be reconstructed.
// It may need a Z-up to Y-up conversion and a right- to left-handed change of basis.
XformImporter.BuildSceneRoot(scene, kvp.Value.transform, importOptions);
}
}
}
else
{
// There is only one root, apply a single transform correction.
XformImporter.BuildSceneRoot(scene, root.transform, importOptions);
}
}
Profiler.EndSample();
Profiler.BeginSample("USD: Post Process Components");
foreach (var processor in root.GetComponents <IImportPostProcessComponents>())
{
try {
processor.PostProcessComponents(primMap, importOptions);
} catch (System.Exception ex) {
Debug.LogException(ex);
}
}
Profiler.EndSample();
}
// Recreate hierarchy.
void AssignParent(pxr.SdfPath path, GameObject go)
{
m_primMap.Add(path, go);
go.transform.SetParent(m_primMap[path.GetParentPath()].transform, worldPositionStays: false);
}