Allow users to define a custom directory to look for RemotingXR.json

Rendering/OpenXRRemoting/vtkOpenXRManagerRemoteConnection.cxx

@@ -41,7 +41,8 @@ bool vtkOpenXRManagerRemoteConnection::Initialize()
   // If found, set the XR_RUNTIME_JSON environment variable. It will be used by the OpenXR loader
   // to not use the system default OpenXR runtime but instead redirect to the Holographic Remoting
   // OpenXR runtime.
-  std::string remotingXRPath = vtksys::SystemTools::FindFile("RemotingXR.json", { libDir, exeDir });
+  std::string remotingXRPath =
+    vtksys::SystemTools::FindFile("RemotingXR.json", { libDir, exeDir, this->RemotingXRDirectory });
   if (remotingXRPath.empty())
   {
     return false;

Rendering/OpenXRRemoting/vtkOpenXRManagerRemoteConnection.h

@@ -29,6 +29,18 @@ public:
   bool EndInitialize() override;
   bool ConnectToRemote(XrInstance instance, XrSystemId id) override;
 
+  ///@{
+  /**
+   * Set/Get a custom path to look for the RemotingXR.json file provided by the
+   * microsoft.holographic.remoting.openxr package.
+   * This file sets the XR_RUNTIME_JSON environment variable used by the OpenXR loader to not use
+   * the system default OpenXR runtime but instead redirect to the Holographic Remoting runtime.
+   * Default is empty. Calling this method after initialization has no effect.
+   */
+  vtkGetMacro(RemotingXRDirectory, std::string);
+  vtkSetMacro(RemotingXRDirectory, std::string);
+  ///@}
+
   /**
    * Enable the OpenXR Remoting extension if supported.
    */
@@ -48,6 +60,7 @@ private:
   void operator=(const vtkOpenXRManagerRemoteConnection&) = delete;
 
   std::string OldXrRuntimeEnvValue;
+  std::string RemotingXRDirectory;
 };
 
 VTK_ABI_NAMESPACE_END

Rendering/OpenXRRemoting/vtkOpenXRRemotingRenderWindow.cxx

@@ -43,6 +43,22 @@ void vtkOpenXRRemotingRenderWindow::SetRemotingIPAddress(const char* host)
   vtkOpenXRManager::GetInstance().GetConnectionStrategy()->SetIPAddress(host);
 }
 
+//------------------------------------------------------------------------------
+void vtkOpenXRRemotingRenderWindow::SetRemotingXRDirectory(const char* path)
+{
+  vtkOpenXRManagerRemoteConnection* connectionStrategy =
+    vtkOpenXRManagerRemoteConnection::SafeDownCast(
+      vtkOpenXRManager::GetInstance().GetConnectionStrategy());
+
+  if (!connectionStrategy)
+  {
+    vtkWarningMacro(<< "Unexpected connection strategy used by vtkOpenXRManager.");
+    return;
+  }
+
+  connectionStrategy->SetRemotingXRDirectory(path);
+}
+
 //------------------------------------------------------------------------------
 void vtkOpenXRRemotingRenderWindow::Initialize()
 {

Rendering/OpenXRRemoting/vtkOpenXRRemotingRenderWindow.h

@@ -25,6 +25,15 @@ public:
    */
   void SetRemotingIPAddress(const char* host);
 
+  /**
+   * Set a custom path to look for the RemotingXR.json file provided by the
+   * microsoft.holographic.remoting.openxr package.
+   * This file sets the XR_RUNTIME_JSON environment variable used by the OpenXR loader to not use
+   * the system default OpenXR runtime but instead redirect to the Holographic Remoting runtime.
+   * Default is empty. Calling this method after the window initialization has no effect.
+   */
+  void SetRemotingXRDirectory(const char* path);
+
   /**
    * Initialize helper window resources.
    */