void BuildCamera(pxr.UsdGeomCamera usdCamera, GameObject go)
{
var cam = go.AddComponent <Camera>();
var cameraSample = usdCamera.GetCamera(m_scene.Time);
cam.fieldOfView = cameraSample.GetFieldOfView(pxr.GfCamera.FOVDirection.FOVHorizontal);
cam.nearClipPlane = cameraSample.GetClippingRange().GetMin();
cam.farClipPlane = cameraSample.GetClippingRange().GetMax();
}
public void SetupScene()
{
InitUsd.Initialize();
// Is the stage already loaded?
if (m_scene != null && m_scene.Stage.GetRootLayer().GetIdentifier() == m_usdFile)
{
return;
}
// Does the path exist?
if (!System.IO.File.Exists(m_usdFile))
{
return;
}
// Clear out the old scene.
UnloadGameObjects();
// Load the new scene.
m_scene = Scene.Open(m_usdFile);
if (m_scene == null)
{
throw new Exception("Failed to load");
}
// Set the time at which to read samples from USD.
m_scene.Time = 0;
// Handle configurable up-axis (Y or Z).
Vector3 up = GetUpVector(m_scene);
var rootXf = new GameObject("root");
rootXf.transform.SetParent(transform, worldPositionStays: false);
if (up != Vector3.up)
{
rootXf.transform.localRotation = Quaternion.FromToRotation(Vector3.up, up);
}
// Convert from right-handed (USD) to left-handed (Unity).
// The math below works out to either (1, -1, 1) or (1, 1, -1), depending on up.
rootXf.transform.localScale = up + -1 * (Vector3.one - up - Vector3.right) + Vector3.right;
// Assign this transform as the root.
m_primMap.Add("/", rootXf);
// Load transforms.
foreach (var path in m_scene.AllXforms)
{
var xf = new USD.NET.Unity.XformSample();
m_scene.Read(path, xf);
var go = new GameObject(path.GetName());
AssignTransform(xf, go);
AssignParent(path, go);
}
// Load meshes.
foreach (var path in m_scene.AllMeshes)
{
var mesh = new USD.NET.Unity.MeshSample();
m_scene.Read(path, mesh);
var go = new GameObject(path.GetName());
AssignTransform(mesh, go);
AssignParent(path, go);
BuildMesh(mesh, go);
}
// Load cameras.
foreach (var prim in m_scene.Stage.GetAllPrimsByType("Camera"))
{
pxr.UsdGeomCamera camera = new pxr.UsdGeomCamera(prim);
var go = new GameObject(prim.GetName());
var xf = new USD.NET.Unity.XformSample();
m_scene.Read(prim.GetPath(), xf);
AssignTransform(xf, go);
BuildCamera(camera, go);
AssignParent(prim.GetPath(), go);
}
// Ensure the file and the identifier match.
m_usdFile = m_scene.Stage.GetRootLayer().GetIdentifier();
}
