public static void CreatePointInstancerManualTest()
{
var scene = USD.NET.Scene.Create();
var stageWeakRef = new pxr.UsdStageWeakPtr(scene.Stage);
var pi = pxr.UsdGeomPointInstancer.Define(stageWeakRef, new pxr.SdfPath("/Instancer"));
var cube = pxr.UsdGeomCube.Define(stageWeakRef, new pxr.SdfPath("/Instancer/Cube"));
// The cube is the only prototype.
pi.CreatePrototypesRel().AddTarget(cube.GetPath());
// Create three instances of the cube (proto index=0).
var intArray = new pxr.VtIntArray(3, 0);
pi.CreateProtoIndicesAttr().Set(intArray);
var mesh = new pxr.UsdGeomMesh();
var meshSamples = new USD.NET.Unity.MeshSample[0];
// Create three positions.
var vec3fArray = new pxr.VtVec3fArray(3);
vec3fArray[0] = new pxr.GfVec3f(-2.5f, 0, 0);
vec3fArray[1] = new pxr.GfVec3f(0, 0, 0);
vec3fArray[2] = new pxr.GfVec3f(2.5f, 0, 0);
pi.CreatePositionsAttr().Set(vec3fArray);
scene.Stage.Export("D:\\instancer.usda");
//
// Compute the root transform for each instance.
//
var xforms = new pxr.VtMatrix4dArray(3);
pi.ComputeInstanceTransformsAtTime(xforms, time: 1.0, baseTime: 0.0);
for (int i = 0; i < xforms.size(); i++)
{
Console.WriteLine(xforms[i]);
}
}
public static void ExportSkelAnimation(ObjectContext objContext, ExportContext exportContext)
{
var scene = exportContext.scene;
var sample = (SkelAnimationSample)objContext.sample;
var go = objContext.gameObject;
var boneNames = exportContext.skelSortedMap[go.transform];
var skelRoot = go.transform;
sample.joints = new string[boneNames.Count];
var worldXf = new Matrix4x4[boneNames.Count];
var worldXfInv = new Matrix4x4[boneNames.Count];
string rootPath = UnityTypeConverter.GetPath(go.transform);
var basisChange = Matrix4x4.identity;
basisChange[2, 2] = -1;
for (int i = 0; i < boneNames.Count; i++)
{
var bonePath = boneNames[i];
if (!exportContext.pathToBone.ContainsKey(bonePath))
{
sample.joints[i] = "";
continue;
}
var bone = exportContext.pathToBone[bonePath];
sample.joints[i] = bonePath.Replace(rootPath + "/", "");
worldXf[i] = bone.localToWorldMatrix;
if (exportContext.basisTransform == BasisTransformation.SlowAndSafe)
{
worldXf[i] = UnityTypeConverter.ChangeBasis(worldXf[i]);
}
worldXfInv[i] = worldXf[i].inverse;
}
var rootXf = skelRoot.localToWorldMatrix.inverse;
if (exportContext.basisTransform == BasisTransformation.SlowAndSafe)
{
rootXf = UnityTypeConverter.ChangeBasis(rootXf);
}
var skelWorldTransform = UnityTypeConverter.ToGfMatrix(rootXf);
pxr.VtMatrix4dArray vtJointsLS = new pxr.VtMatrix4dArray((uint)boneNames.Count);
pxr.VtMatrix4dArray vtJointsWS = UnityTypeConverter.ToVtArray(worldXf);
pxr.VtMatrix4dArray vtJointsWSInv = UnityTypeConverter.ToVtArray(worldXfInv);
var translations = new pxr.VtVec3fArray();
var rotations = new pxr.VtQuatfArray();
sample.scales = new pxr.VtVec3hArray();
var topo = new pxr.UsdSkelTopology(UnityTypeConverter.ToVtArray(sample.joints));
pxr.UsdCs.UsdSkelComputeJointLocalTransforms(topo,
vtJointsWS,
vtJointsWSInv,
vtJointsLS,
skelWorldTransform);
pxr.UsdCs.UsdSkelDecomposeTransforms(
vtJointsLS,
translations,
rotations,
sample.scales);
sample.translations = UnityTypeConverter.FromVtArray(translations);
sample.rotations = UnityTypeConverter.FromVtArray(rotations);
scene.Write(objContext.path, sample);
}
