/// Starts recording the transform to a named transform in a new usd file given by the path.
public bool StartRecording(string path, string sketchName = "/Sketch", string xformName = "/VideoCamera")
{
m_xformName = sketchName + xformName;
if (!InitUsd.Initialize() || string.IsNullOrEmpty(path))
{
return(false);
}
// Find the active camera.
m_RecordingCamera = null;
foreach (var c in GetComponentsInChildren <Camera>())
{
if (c.gameObject.activeInHierarchy && c.isActiveAndEnabled)
{
m_RecordingCamera = c;
}
}
if (m_RecordingCamera == null)
{
return(false);
}
var sketchRoot = ExportUsd.CreateSketchRoot();
m_UsdCamera = new UsdCameraXformSample();
try
{
m_Scene = USD.NET.Scene.Create(path);
}
catch (ApplicationException /*e*/)
{
Debug.LogError("Error creating usda file!");
return(false);
}
m_Scene.Write(sketchName, sketchRoot);
// The time code of the recording is in seconds.
m_Scene.Stage.SetTimeCodesPerSecond(1);
// CameraSample constructor converts the Unity Camera to USD.
// Write the fallback camera parameters.
var cameraSample = new UsdCameraSample(m_RecordingCamera);
// Convert camera params to meters.
cameraSample.clippingRange *= App.UNITS_TO_METERS;
m_Scene.Write(m_xformName, cameraSample);
m_Scene.Time = 0;
m_Scene.StartTime = 0;
m_Scene.EndTime = 0;
m_IsRecording = true;
return(true);
}
/// Plays back a named transform onto the current transform from a usd path.
/// The transform can optionally be smoothed using exponential smoothing.
/// Smoothing will be clamped between 0 - 1.
public void StartPlayback(string sketchName = "/Sketch", string xformName = "/VideoCamera",
float smoothing = 0)
{
m_xformName = xformName;
m_Smoothing = Mathf.Clamp01(smoothing);
m_IsRecording = false;
// Older versions of Tilt Brush exported usda camera paths in decimeters. We now
// export in meters to match USD geometry export. Older versions also didn't export any sketch
// data so we check here for the presence of sketch data to decide how to treat the camera
// path units.
bool hasSketchRoot = m_Scene.Stage.GetPrimAtPath(new pxr.SdfPath(sketchName));
m_xformName = hasSketchRoot ? sketchName + xformName : xformName;
float scale = hasSketchRoot ? App.UNITS_TO_METERS : 1;
m_UnitsInMeters = hasSketchRoot;
m_Scene.Time = null;
m_UsdCameraInfo = new UsdCameraSample();
m_UsdCameraInfo.shutter = new USD.NET.Unity.CameraSample.Shutter();
m_Scene.Read(m_xformName, m_UsdCameraInfo);
m_UsdCamera = new UsdCameraXformSample();
m_Scene.Time = 0;
m_Scene.Read(m_xformName, m_UsdCamera);
var basisMat = AxisConvention.GetFromUnity(AxisConvention.kUsd)
* Matrix4x4.Scale(Vector3.one * scale);
m_UsdCamera.transform = ExportUtils.ChangeBasis(m_UsdCamera.transform, basisMat, basisMat.inverse);
TrTransform xf_WS = UsdXformToWorldSpaceXform(m_UsdCamera);
xf_WS.ToTransform(transform);
m_PlaybackCameras = FindObjectsOfType <Camera>();
}
