Rendering/OpenXR/vtkOpenXRSceneObserver.h

vtkOpenXRSceneObserver is a wrapper around OpenXR scene understanding extensions

vtkOpenXRSceneObserver is a wrapper around OpenXR scene understanding extensions vtkOpenXRSceneObserver uses an event based mecanism to retrieve components. vtkOpenXRSceneObserver will invoke vtkCommand::UpdateDataEvent when a new component is detected by the runtime. This event will forward the new component as calldata.

A vtkOpenXRSceneObserver is instanciated, initialized and updated by vtkOpenXRRenderWindow if vtkOpenXRRenderWindow::EnableSceneUnderstanding is true. vtkOpenXRSceneObserver::Initialize will be called by vtkOpenXRRenderWindow when initialized vtkOpenXRSceneObserver::UpdateSceneData is automatically called by vtkOpenXRRenderWindow::Render() for the window scene observer.

You may instantiate it manually and handle it's lifetime and updates on your own.

See also

vtkOpenXRRenderWindow::SetEnableSceneUnderstanding

vtkOpenXRRenderWindow::GetSceneObserver

vtkOpenXRSceneComponent

void OnNewComponent(vtkObject* object, unsigned long, void* calldata) {
  auto* component = static_cast<vtkOpenXRSceneComponent*>(calldata);
}
 
vtkNew<vtkOpenXRRemotingRenderWindow> renderWindow;
renderWindow->SetEnableSceneUnderstanding(true);
renderWindow->Initialize();
 
vtkOpenXRSceneObserver* sceneObserver = renderWindow->GetSceneObserver();
assert(sceneObserver && "Something went wrong!");
 
vtkNew<vtkCallbackCommand> callback;
callback->SetCallback(OnNewComponent);
 
sceneObserver->AddObserver(vtkCommand::UpdateDataEvent, callback);

// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef vtkOpenXRSceneObserver_h
#define vtkOpenXRSceneObserver_h
 
#include "vtkObject.h"
#include "vtkRenderingOpenXRModule.h" // For export macro
 
#include <memory> // For std::unique_ptr
 
VTK_ABI_NAMESPACE_BEGIN
 
class vtkOpenXRRenderWindow;
class vtkOpenXRSceneComponent;

class VTKRENDERINGOPENXR_EXPORT vtkOpenXRSceneObserver : public vtkObject
{
  struct vtkInternals;
 
public:
  static vtkOpenXRSceneObserver* New();
  vtkTypeMacro(vtkOpenXRSceneObserver, vtkObject);

  bool Initialize();

  bool UpdateSceneData();


  enum SceneConsistency
  {
    // enum values from OpenXR
    SnapshotComplete = 1,
    SnapshotIncompleteFast = 2,
    OcclusionOptimized = 3,
  };
  vtkGetMacro(ComputeConsistency, SceneConsistency);
  vtkSetMacro(ComputeConsistency, SceneConsistency);


  vtkGetMacro(ClippingRadius, double);
  vtkSetClampMacro(ClippingRadius, double, 0.0, 1e100);

  enum SceneFeature
  {
    // enum values from XrSceneComputeFeatureMSFT
    Markers = 1000147000,
  };


  bool EnableComputeFeature(SceneFeature feature);
  void DisableComputeFeature(SceneFeature feature);
  bool IsComputeFeatureEnabled(SceneFeature feature) const;
  bool IsComputeFeatureSupported(SceneFeature feature) const;


  vtkSetMacro(MinimumInterval, double);
  vtkGetMacro(MinimumInterval, double);
 
protected:
  vtkOpenXRSceneObserver();
  ~vtkOpenXRSceneObserver() override;
 
private:
  vtkOpenXRSceneObserver(const vtkOpenXRSceneObserver&) = delete;
  void operator=(const vtkOpenXRSceneObserver&) = delete;
 
  bool CreateMSFTSceneObserver();
 
  std::unique_ptr<vtkInternals> Impl{};
 
  double MinimumInterval{ 2.0 };
  double ClippingRadius{ 2.0 };
  SceneConsistency ComputeConsistency{ SceneConsistency::SnapshotComplete };
};
 
VTK_ABI_NAMESPACE_END
 
#endif